|
Afghanistan | |
| Orris et al. (2002) |
| Orris et al. (2002) |
| Jose Zendrera Collection |
|
Algeria | |
| Rocks & Min.: 17:243. |
|
Angola | |
| Martins da Pedra collection |
|
Antarctica | |
| Beard et al. (2009) |
| Galli et al. (1997) |
| Collection of RJ Martin |
| Collection of RJ Martin |
| Petersen et al. (2004) |
|
Arctic Ocean | |
| Bogdanov et al. (1995) |
|
Argentina | |
| Raúl Jorge Tauber Larry (1971) |
| Raúl Jorge Tauber Larry photo and ... |
| Raúl Jorge Tauber Larry |
- Antofagasta de la Sierra Department
| Tauber (2016) |
| [Opal-A var: Opal-AN] Padrón de Minas de la Provincia de ... |
| Colombo et al. (2011) |
| Padrón de Minas de la Provincia de Chubut (2005) |
| Padrón de Minas de la Provincia de Chubut (2005) |
| ARAGON |
| [Opal-A var: Opal-AN] Padrón de Minas de la Provincia de Chubut (2005) |
- Paso de Indios department
| Raúl Jorge Tauber Larry +2 other references |
| Padrón de Minas de la Provincia de Chubut (2005) |
- Cerro Blanco pegmatite district
| Alfredo Petrov field collected specimens |
| C. Lemanski (re-entry of lost Mindat data) |
- Aguada Del Monte District
| LEAL |
| Juan Carlos Lodovichi |
| Zucol et al. (2005) |
| Raúl Jorge Tauber Larry (1967) |
| Raúl Jorge Tauber Larry (1967) |
| Coira et al. (1995) |
| Milka K. de Brodtkorb (2002) |
- Coronel Felipe Varela department
| LEAL +1 other reference |
| Ra{ul J. Tauber Larry |
| [Opal-A var: Opal-AN] Alfredo Petrov collection |
| Crosta et al. (2015) |
| Aguirre-Urreta (1) |
| Montagne et al. (2014) |
| Tauber (November 2014) |
| Tauber |
| Mirta Quattrocchio (1) |
| Aguirre-Urreta (1) |
| Silvia Barredo (1) |
| Silvia Barredo (1) |
| Silvia Barredo (1) |
| Silvia Barredo (1) |
| Silvia Barredo (1) |
| Montagne et al. (2014) |
| Darío G. Lazo |
| Silvia Barredo (1) |
| Montagna et al. (2014) |
| Montagna et al. (2014) |
| Silvia Barredo (1) |
| Montagna et al. (2014) |
| Montagna et al. (2014) |
| Silvia Barredo (1) |
| Tauber (2014) |
| Montagne et al. (2014) |
- Veinticinco de Mayo Department
| American Mineralogist (1978) |
| Raul J. Tauber Larry |
| A. G. Quiroga y T. Ruíz (1994) |
- San Antonio de los Cobres
| Ronald G. Simpson (2017) +1 other reference |
| Zubía et al. (2008) |
| Raul J. Tauber Larry |
- Coronel Pringles Department
| Galliski et al. (2011) |
| Černý et al. (2003) +1 other reference |
| Galliski et al. (2009) |
| Ribacki et al. (2023) |
| Raúl Jorge Tauber Larry |
| Aliotta et al. (Santa Cruz) |
| Moreira et al. (2015) |
| DEL BLANCO |
- Lago Buenos Aires Department
| Smith (2009) |
- Santiago del Estero Province
| LEAL +1 other reference |
| LEAL +1 other reference |
| LEAL +1 other reference |
| [Opal-A var: Opal-AN] LEAL +1 other reference |
| LEAL +1 other reference |
| Raúl Jorge Tauber Larry +1 other reference |
| Sub secretaría de Minerái de la Nación (1974) |
- Parque Nacional Campo de los Alisos
| Collected by Sebastián Tauber |
| Raúl Jorge Tauber Larry |
| Raúl Jorge Tauber Larry |
| Raúl Jorge Tauber Larry |
| Raúl Jorge Tauber Larry |
|
Armenia | |
| Bowell et al. (2021) |
|
Atlantic Ocean | |
- Mid-Atlantic Ridge complex
| Cherkashev et al. (2013) |
| Melekestseva |
| Sudarikov et al. (2021) |
| Mozgova et al. (2007) |
| Sudarikov et al. (2021) |
| Gablina et al. (2017) |
| Gablina et al. (2018) +1 other reference |
| Gablina et al. (2018) |
| Bortnikov et al. (2001) |
| Melekestseva et al. (2014) |
| Safina et al. (2016) |
| Firstova et al. (2019) |
- Sierra Leone fracture zone
| Sharkov et al. (2007) |
| S. M. Sudarikov and S. V. Galkin ... +1 other reference |
| Fouquet Y et al. (1993) |
- Trans-Atlantic Geotraverse hydrothermal field (TAG)
| Petersen et al. (2000) |
| Gablina et al. (2017) |
- Southern Mid-Atlantic Ridge complex
| Yang et al. (2022) |
|
Australia | |
- Australian Capital Territory
| [Opal-A var: Opal-AN] McQueen +2 other references |
| Liversidge 1887 |
| John Whitehouse (2015) |
| [Opal-A var: Opal-AN] Collection of RJ Martin correlated to ... |
| [Opal-A var: Opal-AN] Minerals in podiform chromitites - Tumut Serpentinite Province et al. (1) |
| [Opal-A var: Opal-AN] Curtis et al. (2020) |
| Wray (2001) |
| Gilligan et al. (1995) |
| Tschernich (1992) +1 other reference |
| Oskierski et al. (2013) |
| |
| |
| Markham et al. (1975) +2 other references |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Smith (1999) |
| aracic |
| Cram (2004) |
| Smith (1999) |
| Cram (2004) |
| Cram (2004) |
| aracic |
| Cram (2004) |
| Aracic (1999) |
| Smith (1999) |
| Smith (1999) |
| Cram (2004) |
| Smith (1999) |
| Smith (1999) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Smith (1999) |
| Smith (1999) |
| aracic +1 other reference |
| aracic |
| |
| www.walkinmine.com.au (n.d.) |
| aracic +2 other references |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Cram (2004) |
| Smith (1999) |
| aracic |
| W. Curran (1896) |
| |
| Caucia et al. (2013) |
| Refs. Cram (2004) |
| aracic |
| Sorrell (n.d.) |
| [Opal-A var: Opal-AN] specimen in collection |
| Collection of RJ Martin |
| Brown et al. (2001) |
| Mumme I.A. and Ball R.A. On the Genesis ... |
| Brown et al. (2001) |
| Henley et al. (2001) |
| |
| Henley et al. (2001) +1 other reference |
| Brown et al. (2001) |
| Brown et al. (2001) |
| Sorrell (n.d.) |
| |
| [Opal-A var: Opal-AN] Jensen (1912) |
| Gill (1973) |
| Segnit (1973) |
| |
- Broken Hill South Mine (BHS Mine; South Mine)
| [Opal-A var: Opal-AN] Birch et al. (1997) |
| [Opal-A var: Opal-AN] The Daydream Mine |
| Aracic (1999) |
| Mason (1976) +1 other reference |
- Mosquito Creek Wolfram Field
| Benger (1990) |
| |
| |
| Natural History Museum |
| en.wikipedia.org (n.d.) |
| en.wikipedia.org (n.d.) |
| Rocks & Min.: 8:15. |
| [Opal-A var: Opal-AN] |
| Richardson et al. (1997) |
| Sorrell (n.d.) |
| Derrick |
| [Opal-A var: Opal-AN] Graham Lee Collection |
| [Opal-A var: Opal-AN] Personal collection and shown on photo |
| MacNevin A.A. & Holmes G.G. (1980) |
| Hall (1988) |
| |
| |
| |
| Rocks & Min.:8:4. |
| Pecover (2007) |
| Rocks & Min.:8:15. |
| Martins da Pedra collection. +1 other reference |
| |
- Glasshouse Mountains Province
| |
| [Opal-A var: Opal-AN] |
| |
| Rob Lavinsky specimen |
| |
| |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Kessler (1983) +1 other reference |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Lintern et al. (1999) |
| Thiry et al. (1991) |
| Sorrell (n.d.) |
| [Opal-A var: Opal-AN] Francis (2010) |
| Ben Grguric |
| [Opal-A var: Opal-AN] Sorrell (n.d.) +1 other reference |
- Mawson Plateau - Paralana Hot Springs area
| Brugger et al. (2005) |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Brugger et al. (2003) |
- Vulkathunha - Gammon Ranges National Park
| [Opal-A var: Opal-AN] Pers. Comm. M. Willoughby. Found on ... |
| Gee et al. (1908) |
| Record of Mines - Mine Summary Card ... |
| Pring et al. (1994) |
| [Opal-A var: Opal-AN] Personal Collection of M. Willoughby. |
| |
- South Mt Lofty Ranges (Adelaide Hills)
| |
- Mount Crawford Forest Reserve
| Gee et al. (1908) |
| Barnes et al. (1992) +1 other reference |
| Barnes et al. (1992) |
| Liesegang et al. (2018) |
| Barnes et al. (1992) |
| Barnes et al. (1992) |
| Barnes et al. (1992) +1 other reference |
| Barnes et al. (1992) |
| Barnes et al. (1992) +1 other reference |
| |
| [Opal-A var: Opal-AN] Collection of M. Willoughby. |
- Boolcoomatta Reserve (Boolcoomata Station)
| [Opal-A var: Opal-AN] |
- Mt Victor Plumbago Station
| [Opal-A var: Opal-AN] J Bosworth |
- Circular Head municipality
| Sutherland et al. (1967) +1 other reference |
| www.crocoite.com (2003) |
| |
- Devonport City municipality
| [Opal-A var: Opal-AN] www.crocoite.com (2003) |
| |
| Bottrill et al. (2008) |
| Taheri |
| Bottrill et al. (2008) |
| Bottrill et al. (2008) |
- Northern Midlands municipality
- Avoca-Royal George mining district
| [Opal-A var: Opal-AN] Mathew Latham collection |
| R Bottrill collection |
- Waratah-Wynyard municipality
| Bottrill +1 other reference |
| R Bottrill +1 other reference |
| [Opal-A var: Opal-AN] crocoite.com |
| [Opal-A var: Opal-AN] Sorrell (n.d.) |
| Sorrell (n.d.) |
| [Opal-A var: Opal-AN] Toby Billing collection |
| |
| [Opal-A var: Opal-AN] Museum Victoria Mineralogy Collection |
| [Opal-A var: Opal-AN] Museum Victoria Mineralogy Collection |
| [Opal-A var: Opal-AN] Judy Rowe collection |
| |
| Curtis +3 other references |
| |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Birch (1989) |
| Sorrell (n.d.) |
| Sorrell (n.d.) |
| Sorrell (n.d.) |
| Webb et al. (1982) |
| Sorrell (n.d.) |
| |
| [Opal-A var: Opal-AN] Sorrell (n.d.) |
| [Opal-A var: Opal-AN] J.D.Hollis. 1979. Some little known ... |
| [Opal-A var: Opal-AN] Ryan Eagle field collected 2018 |
| [Opal-A var: Opal-AN] Ryan Eagle personal observation 2016 |
| [Opal-A var: Opal-AN] Judy Rowe collection |
| Alan Goldstein colln. |
| [Opal-A var: Opal-AN] specimen in collection |
| [Opal-A var: Opal-AN] ex Joan Lamond Collection |
| |
| [Opal-A var: Opal-AN] W.D.Birch & D.A.Henry 1993. Phosphate ... |
| |
| [Opal-A var: Opal-AN] Sorrell (n.d.) |
| [Opal-A var: Opal-AN] Birch et al. (1993) |
| [Opal-A var: Opal-AN] Jon Mommers collection |
| Sorrell (n.d.) |
| [Opal-A var: Opal-AN] Sorrell (n.d.) +1 other reference |
| [Opal-A var: Opal-AN] Sorrell (n.d.) |
| [Opal-A var: Opal-AN] Sorrell (n.d.) |
| |
| Carr et al. (2021) |
| Simpson (1952) |
| Fetherston et al. (2012) |
| Jacobson. (2007) |
| Fetherston et al. (2012) |
| Geology of the Northern Perth Basin +3 other references |
| Geology of the Northern Perth Basin- a ... +4 other references |
| Kim McDonald collection |
| Fetherston et al. (2013) |
| Simpson Mineral Collection of the ... +4 other references |
| Simpson (1948) |
| [Opal-A var: Opal-AN] J M Bennett Collection |
| On Gearkstite at Gingin |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| De Broekert (2003) |
| Feldtmann (1919) |
| Kim McDonald collection |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Kalgoorlie Miner newspaper (1920) |
| Simpson (1948) |
| mrdate.usgs.gov (n.d.) |
| Pardieu (2011) |
| Simpson (1948) |
| Grguric (2009) |
| Marston (1979) |
| Peter Downes |
| Fetherston et al. (2012) |
| www.fairstarresources.com (n.d.) |
| Grguric et al. (in press) |
| Grguric et al. (2006) |
| Fetherston et al. (2013) |
| Llorca (1998) |
| Simpson (1948) |
| The Inquirer and Commercial News newspaper (Perth) |
| The Inquirer and Commercial News newspaper (Perth) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| [Opal-A var: Opal-AN] Fetherston et al. (2013) |
| Downes et al. (2017) |
- Karara Conservation Reserve
| [Opal-A var: Opal-AN] Jacobson et al. (2007) |
| Fetherston et al. (2013) |
| Fetherston et al. (2013) |
| Simpson (1932) +1 other reference |
- Youangarra Goldfield (Curran's Find)
| Jorgensen et al. (2017) |
| Moolooite +2 other references |
| Clarke et al. (1986) |
- Mount Phillip Station (Mount Phillips Station)
| Kim Macdonald |
| Locality description |
| Bridge et al. (1977) |
| Fetherston et al. (2013) |
| Simpson et al. (1948) |
| Simpson (1948) |
| Simpson (1948) |
| [Opal-A var: Opal-AN] Pegamtites of Western Australia +2 other references |
| Simpson (1948) |
| Simpson (1948) |
| Simpson (1948) |
| The Southern Cross Times newspaper (1913) |
| Simpson (1948) |
|
Austria | |
| [Opal-A var: Opal-AN] Schebesta (1983) +2 other references |
| [Opal-A var: Opal-AN] - (n.d.) +2 other references |
| [Opal-A var: Opal-AN] Tuma (1991) |
| Exel (1993) |
| Exel (1993) |
| Kümel (1957) |
| Kümel (1957) |
| F. Brandstätter: Carinthia II 184./104.:248-252 (1994) |
| [Opal-A var: Opal-AN] Niedermayr et al. (1995) |
- Sankt Veit an der Glan District
| [Opal-A var: Opal-AN] Niedermayr et al. (1995) |
| H. Meixner: Der Karinthin 9:184-189 (1950) |
- Spittal an der Drau District
| Pichler (2009) |
| [Opal-A var: Opal-AN] Niedermayr et al. (1995) |
| H. Meixner: Carinthia II 171./91.:35-36 (1981) |
- Bad Sankt Leonhard im Lavanttal
| [Opal-A var: Opal-AN] Meixner (1952) +1 other reference |
- Frantschach-Sankt Gertraud
| [Opal-A var: Opal-AN] |
| Niedermayr et al. (1995) |
| G. Weissensteiner: Der Karinthin 63:183-186 (1970) |
| Niedermayr et al. (1995) |
- Bruck an der Leitha District
| Niedermayr et al. (1974) |
| Götzinger et al. (1994) |
| Götzinger et al. (1994) |
| [Opal-A var: Opal-AN] C.Auer (2018) |
| ötzinger et al. (1994) |
| Pristacz et al. (2011) |
- Dietmannsdorf an der Wild
| Kugler (1995) |
| www.kristall-werkstatt.at (2021) |
| Niedermayr (1990) |
| Niedermayr (1986) |
| Albert Prayer collection |
| Exel (1993) |
| [Opal-A var: Opal-AN] Kolitsch et al. (2013) |
| Exel (1993) |
| Kolitsch (2021) |
| Kolitsch et al. (2011) |
- Albrechtsberg an der Großen Krems
| Fechner et al. (1985) |
| RIEDEL (2008) |
| [Opal-A var: Opal-AN] Harald Schillhammer collection |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| Goldmann et al. (2008) |
| - (n.d.) |
| [Opal-A var: Opal-AN] Kolitsch et al. (2023) |
- Sankt Leonhard am Hornerwald
| Exel (1993) |
| Exel (1993) |
| Erwin Löffler collection |
| Löffler et al. (2011) |
| Holzer et al. (1963) |
| GÖTZINGER (1987b) |
- Sankt Pölten-Land District
| Kolitsch et al. (2015) |
| HAMMER & ĆORIĆ (2007) |
| Götzinger (2008) |
- Waidhofen an der Thaya District
| Weiss (1960) |
| [Opal-A var: Opal-AN] Harald Schillhammer collection +1 other reference |
| [Opal-A var: Opal-AN] Kolitsch et al. (2014) |
| Wolfgang Ecker collection |
| Exel (1993) |
| - (n.d.) +1 other reference |
| Neschen (n.d.) +1 other reference |
| Zirkl (1961) |
- St. Johann im Pongau District
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
- Siglitz - Bockhart gold mining district
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| Kolitsch et al. (2019) |
- Mitterberg mining district
| [Opal-A var: Opal-AN] Strasser (1989) |
| Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
- Mittersill Scheelite deposit
| [Opal-A var: Opal-AN] Strasser (1989) |
- Neukirchen am Großvenediger
- Abichl Alp - Beryller area
| [Opal-A var: Opal-AN] Exel (1993) |
| [Opal-A var: Opal-AN] Strasser (1989) |
| [Opal-A var: Opal-AN] Strasser (1989) |
- Bruck-Mürzzuschlag District
| Postl (1985) |
- Oberdorf (Oberdorf an der Laming)
- Oberdorf magnesite deposit
| Gerald Gesselbauer (2010) |
| Gerald Gesselbauer (2010) |
- Deutschlandsberg District
| - (n.d.) |
| [Opal-A var: Opal-AN] Aufschluss 1972 (SB) |
| [Opal-A var: Opal-AN] Taucher+Hollerer (2001) |
| [Opal-A var: Opal-AN] Weissensteiner (1975) |
| [Opal-A var: Opal-AN] Weninger (1976) |
| [Opal-A var: Opal-AN] Exel (1993) |
| [Opal-A var: Opal-AN] Koritnig |
| Postl & Moser (1988) |
- Sankt Oswald ob Eibiswald
| [Opal-A var: Opal-AN] Meixner (1937) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Aufschluss 1972 (SB) |
| Alker (1972) |
| Josef Taucher & Christine Elisabeth Hollerer (2012) |
| www.markasit070752.ws24.cc (n.d.) |
| [Opal-A var: Opal-AN] Neuwirth (1952) |
- Südoststeiermark District
| [Opal-A var: Opal-AN] Aufschluss 1972 (SB) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| Exel (1993) |
| |
| [Opal-A var: Opal-AN] Postl et al. (1996) |
| [Opal-A var: Opal-AN] Exel (1993) |
| A.Weiß (1972) |
- Prinzkogel (Prinzenkogel)
| Jakely (2008) |
| Kolitsch et al. (2019) |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Niedermayr (1987) +2 other references |
| [Opal-A var: Opal-AN] Josef Schadler (Handschriftliche Aufzeichnungen) |
| [Opal-A var: Opal-AN] Kolitsch (2008) +1 other reference |
| [Opal-A var: Opal-AN] Neschen (n.d.) |
|
Belgium | |
| Hatert et al. (2002) |
| Buttgenbach (1947) +2 other references |
| Hatert et al. (2002) |
| Hatert et al. (2002) |
| Hatert et al. (2002) |
| Mélon et al. (1976) |
| Hatert et al. (2002) |
| Hatert et al. (2002) |
| natuurtijdschriften.nl (n.d.) |
| Fourmarier (1901) +1 other reference |
| Hatert et al. (2002) |
|
Bolivia | |
| Kempff et al. (La Paz, 2009) |
- Caracoles mining district
| Kempff et al. (La Paz, 2009) |
- José Manuel Pando Province
- Berenguela mining district
| USGS Bulletin # 1975 |
| [Opal-A var: Opal-AN] Ahlfeld et al. (1955) |
| USGS Bulletin # 1975 |
| USGS Bulletin # 1975 |
- Pantaleón Dalence Province
| Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) |
| Wilson (2001) |
| Ahlfeld et al. (1964) |
| Salomon Rivas y Federico Ahlfeld (1998) |
- Antonio Quijarro Province
| [Opal-A var: Opal-AN] Salomon Rivas y Federico Ahlfeld (1998) |
| [Opal-A var: Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955) |
| [Opal-A var: Opal-AN] Federico Ahlfeld and Jorge Muñoz Reyes (1955) |
- Cornelio Saavedra Province
| Pough (1976) |
| Ahlfeld & Munoz Reyes (1955) |
| [Opal-A var: Opal-AN] Alfredo Petrov collection |
| www.mineralmundi.com |
| www.mineralmundi.com (in the sulphur deposits) |
| Petrov et al. (2006) |
| Wilson (2001) |
| USGS Bulletin # 1975 (1992) |
| Federico Ahlfeld and Alejandro Schneider-Scherbina (1964) |
| Geology and Mineral Resources of the Altiplano and Cordillera Occidental (USGS Bulletin no. 1975) |
| Donald Richter (1992) |
|
Brazil | |
| |
| Sauer (1982) +1 other reference |
| Cassedanne et al. (1977) |
| Sauer (1982) |
| ... |
| F. Zaccarini (2006) |
| Dutra et al. (2011) |
| Projeto Apatita |
| [Opal-A var: Opal-AN] Mineralogical Record (1977) |
| Projeto Apatita |
| Projeto Apatita |
| Projeto Apatita - DNPM |
| Martins da Pedra collection |
| Atencio et al. (2004) |
| Chaves et al. (Mesoproterozóico) |
| [Opal-A var: Opal-AN] Pagano et al. (2001) |
| [Opal-A var: Opal-AN] Cassedanne et al. (1999) |
| [Opal-A var: Opal-AN] Menezes (n.d.) |
| Chukanov et al. (2007) |
| Revista Brasileira de Geociências |
| Pavel M. Kartashov analytical data |
| [Opal-A var: Opal-AN] de Brito Barreto et al. (2010) +1 other reference |
- Vieirópolis pegmatite field
| [Opal-A var: Opal-AN] e Souza et al. (2020) |
| Geological Survey Professional Paper 327 (U.S. Department of the Interior, 1959) |
| Sauer (1982) |
| Revista Escola de Minas 68 (2015) +1 other reference |
| Costa et al. (2016) |
| Sauer (1982) +1 other reference |
| de Brito Barreto et al. (2010) |
| Sauer (1982) +1 other reference |
| Sauer (1982) |
| Sauer (1982) |
| Sauer (1982) |
| de Brito Barreto et al. (2010) |
| de Brito Barreto et al. (2010) |
| Sauer (1982) |
| Sauer (1982) +1 other reference |
| Sauer (1982) |
| de Brito Barreto et al. (2010) |
| de Brito Barreto et al. (2010) |
| de Brito Barreto et al. (2010) |
| Sauer (1982) |
| |
| de Hollanda et al. (2017) |
| Sauer (1982) |
| |
| [Opal-A var: Opal-AN] de Brito Barreto et al. (2010) |
| de Brito Barreto et al. (2010) |
| ... |
| Fernando Brederodes Collection |
| Frank (2008) |
| Sauer (1982) |
| Strieder et al. (2006) |
| |
| [Opal-A var: Opal-AN] Manfred Bergmann (2009) |
| Revista Brasileira de Geociências ... |
| American Mineralogist 54:966-969 +1 other reference |
| Fosfatos e Silicatos Secundários de ... |
| [Opal-A var: Opal-AN] Ruiz (2001) |
|
Bulgaria | |
| Aleksiev (1967) |
| Marchev et al. (2002) |
- Mineralni Bani Municipality
| Marcus Voigt Collection |
| [Opal-A var: Opal-AN] Marcus Voigt Collection |
| ... |
| Dimowa et al. (2022) |
| www.clmc.bas.bg (2003) |
| Marchev +6 other references |
| www.clmc.bas.bg (2003) |
| Anton Ivanov field observation |
| Tschernich (1992) |
| Encheva |
| Marcus Voigt Collection |
| I. Kostov et al. (1964) |
| Marcus Vau Collection |
|
Cambodia | |
| [Opal-A var: Opal-AN] Economic and Social Commission for Asia and the Pacific (1993) |
| Austin (November–December 2005) |
| [Opal-A var: Opal-AN] Economic and Social Commission for Asia and the Pacific (1993) |
| Piilonen et al. (2022) |
|
Cameroon | |
| Willems et al. (2002) |
|
Canada | |
| Bertram et al. (1975) +1 other reference |
| Peatfield (n.d.) |
| Peatfield (n.d.) |
| Peatfield (n.d.) |
| Tschernich (1992) |
| www.em.gov.bc.ca/cf/minfile |
| Wojdak |
| MINFILE No 093E 120 |
| Minfile Database (2017) |
| www.em.gov.bc.ca/cf/minfile +1 other reference |
| Phillips (1978) +1 other reference |
- Newfoundland and Labrador
| White (2015) |
| Canadian Mineralogist 41:117-137 |
| J.N. Wingard. |
| H. Piers |
| Michael Adamowicz Collection |
| Shadow Lake RockHounders Facebook group |
- Brudenell-Lyndoch-and-Raglan
| www.ontariominerals.com/berylpit.htm |
- Les Lacs-du-Témiscamingue
| Ansell et al. (1980) |
- La Vallée-du-Richelieu RCM
| membres.lycos.fr (2003) |
| Horváth et al. (1998) |
| Horváth et al. (1998) |
| Sabina (1972) |
|
Cape Verde | |
| M.M.S. Cabral Pinto et al. (2011) |
|
Chile | |
| Atencio et al. (2012) +1 other reference |
| Chukanov et al. (2016) |
- Caracoles mining district
| Braithwaite et al. (2004) |
| Cook (1978) |
| TESIS PARA OPTAR AL GRADO DE MAGÍSTER ... +1 other reference |
| Vidal et al. (2022) +1 other reference |
| samples analysed by Gerhard Mohn and ... |
| Munoz-Saez et al. (2020) |
- Cachiyuyo de Llampos mining district
| samples analysed by Gerhard Mohn and ... |
| samples analysed by Gerhard Moehn |
| samples analysed by Jochen Schlüter |
| Sernageomin database 2005 +1 other reference |
- Las Pintadas mining district
| samples analysed by Gerhard Mohn and ... |
- Pampa Larga mining district
| samples analysed by Dr. Tony Kampf +2 other references |
| samples analysed by Gerhard Mohn and ... |
| Economic Geology +5 other references |
| Jannas R./Araneda R. +3 other references |
| Darío Chinchilla et al. (2016) |
| TOM HENRICKSEN et al. (2002) |
| [Opal-A var: Opal-AN] Tetra Tech Chile (2019) |
|
China | |
| Wenya Zhou and Deming Xu (1990) |
| Yuanming Pan and Ping Dong (1999) |
| Pan Fang et al. (1981) +2 other references |
| Zhang et al. (2023) |
| Chunhua Wen et al. (2011) |
| National Geological Archives of China ... |
| Gongqin Zhang (1986) |
| Nanlai Zheng et al. (1986) +1 other reference |
| pubs.usgs.gov (2006) |
| Yachui Jiang et al. (1994) |
| [Opal-A var: Opal-AN] C. Lemanski et al. (1) |
| National Geological Archives of China ... |
| Laigeng Yang (1989) |
| Yuanchao Shen et al. (2006) +1 other reference |
| Gongsheng Yan (1987) |
| Liangshu Shu et al. (2004) |
| Liangshu Shu et al. (2004) |
| Dahlkamp et al. (2009) |
| Min et al. (2002) |
| Yongzhi Zhang and Maorong Zhen (2004) |
| Hanzhu Wang (1985) |
| Zhang et al. (2018) |
| Guilin Xu et al. (2006) |
| wrgis.wr.usgs.gov (2004) |
| Xiangwen Li et al. (2014) |
| Zhong Tang et al. (2010) |
| Yongwei Huang et al. (2010) +1 other reference |
| Jianguo Yang et al. (2005) |
| www.portergeo.com.au (n.d.) +1 other reference |
| Jichang Weng et al. (2010) |
| Guang Wu et al. (2013) |
- Ma On Mountain (Ma On Shan)
| Li (2008) |
| Guozhang Wen et al. (1993) |
| Ziqiang Wei (1976) |
| Hunan 230 Laboratory et al. (1976) |
| Ziqiang Wei (1976) |
| Ziqiang Wei (1976) |
| Hou et al. (2023) |
- Alxa League (Alashan Prefecture)
| Dianhao Huang and Baolin Wang (1997) |
- Baotou City (Baotou Prefecture)
- Bayan Obo mining district
| Qingchang Meng (1981) |
- Bayannur City (Bayannao'er Prefecture)
- Urad Rear Banner (Wulate Houqi)
| Zhaolong Li et al. (1981) |
| Zhaolong Li et al. (1981) |
- Chifeng City (Ulanhad League; Chifeng Prefecture)
- Bairin Left Banner (Balin Zuoqi)
| Tai Zhang and Yunji Liu (2002) |
- Hinggan League (Xing'an Prefecture)
| Lingan Bai et al. (2012) |
- Hulunbuir City (Hulunbei'er Prefecture)
- Ergun City (E'erguna Co.)
| Liu et al. (2022) |
| Xu et al. (2022) |
| Xu +4 other references |
- Old Barag Banner (Chenba'erhu Co.)
| Feng Yuan et al. (2012) |
- Ulanqab City (Wulanchabu Prefecture)
- Dorbod Banner (Siziwang Co.)
| Fengjun Nie et al. (2008) |
- Xilingol League (Xilinguole Prefecture)
| Zou et al. (2022) |
| Tianhu Chen et al. (2002) +1 other reference |
| Wenguang Li (1997) +1 other reference |
| Kecong Han and Shengyun Ma (1985) |
| Yunhuai Lin (1986) |
- Xiushui Uranium ore field
| Dahlkamp et al. (2009) |
| Dahlkamp et al. (2009) |
| Jie Yao et al. (2002) |
- Jiangyuan District (Hunjiang Co.)
| Shiyuan Wang et al. (2007) |
| Bin Kang et al. (2000) |
| Hai Zhao et al. (2008) |
| Renyi Chen and Zhongyao Rui (1993) |
| Changfu Chen et al. (1999) |
| Yongtao Zhang and Guiqin Tang (1986) |
- Ngawa Autonomous Prefecture (Aba Autonomous Prefecture)
- Zoigê Co. (Ruo'ergai Co.)
| Su Sun (1993) |
| www.cicresources.com (2006) |
- Damxung Co. (Dangxiong Co.)
| Xiangang Meng et al. (2004) |
- Nagchu Prefecture (Naqu Prefecture)
| Shenghao Yan et al. (2003) +1 other reference |
- Qamdo Prefecture (Changdu Prefecture)
| Yu et al. (2024) |
- Xigazê Prefecture (Rikaze Prefecture; Shigatse Prefecture)
- Ngamring Co. (Angren Co.)
| Yuanyi Zhao et al. (2006) |
- Xaitongmoin Co. (Xietongmen Co.)
| Xinghai Lang et al. (2011) |
- Kezilesu Autonomous Prefecture (Kizilsu Autonomous Prefecture; Qizilsu Autonomous Prefecture)
- Aketao Co. (Akto Co.; Aqto Co.)
| Zhang et al. (2022) |
| Lianchang Zhang et al. (2004) |
- Wulumuqi Prefecture (Ürümqi Prefecture; Ürümchi Prefecture)
- Wulumuqi Co. (Ürümqi Co.; Ürümchi Co.)
| Jincao Wang et al. (2000) |
- Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
- Aletai Prefecture (Altay Prefecture)
- Jimunay Co. (Jeminay Co.; Jeminey Co.)
- Eastern Sawur Caldera Complex
| Yang et al. (2009) |
| [Opal-A var: Opal-AN] Wuhan Huaze Science & Technology ... |
| Dahlkamp et al. (2009) |
| Dahlkamp et al. (2009) |
| Meixiang et al. (1987) |
| Pin'an Wang (2001) |
| Shilu Zhang (1986) |
| Yunman Zhou et al. (2009) +1 other reference |
| Shilu Zhang (1986) |
| www.spartonres.ca (n.d.) |
| Guangjun Yu and Ruyong Xie (1986) +1 other reference |
- Huize Zn-Pb-(Ag) ore field
| Senning Tang (1984) |
| Panov et al. (1989) |
|
Colombia | |
| [Opal-A var: Opal-AN] - (2002) |
| Daniel S Yunis |
|
Costa Rica | |
| www.mineralmundi.com |
| www.mineralmundi.com |
| Zeledón (2004) |
|
Cuba | |
| |
|
Czech Republic | |
| Kratochvíl |
| Zemek +5 other references |
| Zacek et al. (1995) |
| Pauliš |
- Moldanubian Zone pegmatites
| Novák et al. (2013) +1 other reference |
| www.mineralos.cz (2003) |
| Lapis 2002 (7/8) |
| Bufka |
| [Opal-A var: Opal-AN] |
| Pauliš P. Nejzajímavější ... |
| Janečka et al. (stav ke dni 1.7.1966) |
| Scharm +7 other references |
| Fengl +3 other references |
| Pauliš |
| Kruťa |
| Prachař +6 other references |
| Zak (1956) +1 other reference |
| Pauliš P. Mineralogické lokality ... |
| Hofmanovi P. a R.: Mineralizace ... |
| Janouš +4 other references |
| Navrátil +4 other references |
| Pauliš +3 other references |
- České Budějovice District
| Boris Pralovszky find & collection |
| Duda +1 other reference |
| |
| [Opal-A var: Opal-AN] Cícha J. |
| Litochleb |
| www.mineralos.cz (2003) |
| Vrtiška et al. (2019) |
| Ulrych |
| Dana RICHTEROVÁ et al. (http://geolines.gli.cas.cz/fileadmin/volumes/volume13/G13-106.pdf) |
| Mrázek |
| Uwe Kolitsch (visual ID) |
| Jirásek |
| Houzar |
| ... |
| Koníčková Š. et al. (2016) |
| Chukanov et al. (2019) |
| Bouška |
| Wiesner |
| Ř +5 other references |
| Pauliš P. et al. (2015) |
| Fengl +3 other references |
| P.Zeman et al. (2017) |
| [Opal-A var: Opal-AN] Hibsch et al. (1911) |
- Hořenec (Horzenz; Horschenz)
| Filippi |
| Svejkovský J. |
| Filippi +5 other references |
| Roman Gramblička collection |
| Bouška |
| Velebil |
| Analysed by geology lab Green Gas DPB |
| Bouška |
| [Opal-A var: Opal-AN] www.geocities.com/Smula.geo |
| [Opal-A var: Opal-AN] |
| Paulis et al. (2014) |
| [Opal-A var: Opal-AN] Radoň M. Významné mineralogické lokality Českého středohoří. Minerál 2009 (2) |
| P.Pauliš |
| Ulrych (2000) |
| [Opal-A var: Opal-AN] |
| Slavíček |
| Houzar |
| Němec et al. (monografie hadce) |
| Trnka M (2006) |
- Žďár nad Sázavou District
| Paulis P. (2001) |
| Staně +4 other references |
| Staněk (2009) |
| Staněk |
| Petr Pauliš (2001) |
| Novák |
| Petr Pauliš: Nejzajímavější mineralogická naleziště Moravy a Slezska II. (2005) |
| Novák +2 other references |
| Velebil +5 other references |
| Kopa |
| Canadian Mineralogist +1 other reference |
| Petr Pauliš (2001) +1 other reference |
- Uherské Hradiště District
| Pauliš |
|
Czech Republic/Germany/Poland | |
| Bauer & Bouska |
|
Denmark | |
| Bøggild (1943) +1 other reference |
| Torben Kjeldgård photo & specimen |
| Bøggild (1943) +1 other reference |
|
DR Congo | |
| Gauthier et al. (1989) |
| Edwards (1917) |
| [Opal-A var: Opal-AN] Uwe Haubenreisser collection |
|
Ecuador | |
| |
| www.municipiodealausi.gob.ec (n.d.) |
| Ordoñez (2006) |
- Zamora-Chinchipe Province
| an NI 43-101 Technical Report prepared ... +1 other reference |
|
Egypt | |
| S. Tosson et al. |
|
Ethiopia | |
| - (n.d.) |
| GIA 2019 |
| Gem Information (Japan Germany Gemmological Laboratory) |
| Chauviré et al. (2017) |
| Boris Chauviré et al. (2019) |
| Schäfer (2012) |
| Rondeau et al. (2010) |
| Lore Kiefert et al. (2014) |
| Rondeau B. et al. (2009) |
| Google Earth/José Zendrera |
| Žáček V et al. (2015) |
| Alfredo Petrov field observations |
| Jelenc (1966) |
- Southern Nations Nationalities and Peoples' Region
| [Opal-A var: Opal-AN] - (Rock Currier collection) |
|
Europe | |
| Berbain et al. (2012) |
| Petr Fuchs |
|
Faroe Islands | |
| |
| Collection of Volker Betz |
| Zeolite collection of Volker Betz +1 other reference |
| Caucia et al. (2013) |
| Caucia et al. (2013) |
|
Fiji | |
| |
|
Finland | |
| Ilkka Mikkola collection |
| Lahti Seppo I. 2011. Kotkan ... |
| The world of opals By Allan W. Eckert |
| P. Koski sample |
| Joel Dyer collection |
| Niskanen (2014) |
|
France | |
| M Arliguie collection |
| Périchaud (1985) |
| Yves Masson specimens |
| Bull. Soc. Franç. Minéralo. ... |
| Vessely Yannick collection |
| Yves Masson specimen |
| www.brgm.fr (2003) |
| [Opal-A var: Opal-AN] Robin Fialip |
| Belot (1978) |
| |
| [Opal-A var: Opal-AN] Pierre Le Roch Collection |
| Pélisson (1989) |
| [Opal-A var: Opal-AN] Collected by Stéphane Jamon |
| [Opal-A var: Opal-AN] Aufschluss 1974 (3) |
| Belot (1978) |
| Périchaud (1986) |
| [Opal-A var: Opal-AN] Anthony Geneyton Collection |
| BRGM (1981) |
| G. Demarcq |
| |
| Remi Bornet Collection |
| Belot (1978) +1 other reference |
| Remi Bornet Collection |
| Remi Bornet Collection |
| Aimé Rudel : "Curiosités Géologiques ... |
| Remi Bornet Collection |
| Remi Bornet Collection |
| Remi Bornet Collection |
| "Les minéraux et al. (1977) |
| - (n.d.) |
| |
| G. Artioli et al. |
| my collection |
| [Opal-A var: Opal-AN] Barrier et al. (2009) |
| Alain Tuel collection |
| Mallard |
| |
| Mboungou-Kongo (2002) |
| J.-J. Périchaud: "Où trouver les minéraux d'Auvergne" et al. (Clermont-Ferrand) |
| J.-J. Périchaud: "Où trouver les minéraux d'Auvergne" et al. (Clermont-Ferrand) |
| P.-C. Guiollard (2002) |
| Queneau (n.d.) |
| |
| |
| J. Geffroy |
| J. Chervet |
| J. Chervet and G. Branche : ... |
| Coueille (1988) |
| Gourault et al. (2021) |
| OLLIC Pascal Collection |
| Germain C. (1988) |
| Bibinger et al. (2014) |
| Yann Lukas (1978) |
| John BRUNET collection |
| BRUNET (2016) |
| R. Pierrot |
| The Quincyte pigments: fossil quinones ... |
| COCHER (2015) |
| Pelleter et al. (2017) |
| Pelleter et al. (2017) |
| Olivier Mével specimen |
| Belot (1978) |
| |
| Belot (1978) |
- Arrondissement of La Trinité
| Lacroix (1910) |
- Arrondissement of Le Marin
| Robertson Collection |
| Lacroix (1910) |
| Briggs (1975) |
| Berger +1 other reference |
| Briggs (1975) |
| Berger +1 other reference |
| Berger +1 other reference |
| Yale Peabody Museum |
| [Opal-A var: Opal-AN] Ansermet et al. (2010) |
| Lièvre et al. (2002) |
| Belot (1978) |
| BRGM survey data |
| J. Geffroy |
| Econ Geol (1989) |
| Georges FAVREAU collection and EDX ... |
| |
| [Opal-A var: Opal-AN] Queneau (n.d.) |
| Inventaire Minéralogique de la France ... |
| TREILLARD Michel collection |
| collection bernard bouissac |
| collection bernard bouissac |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Berbain et al. (2012) |
| [Opal-A var: Opal-AN] Remy et al. (2014) |
| Jean-Marie LAURENT's collection |
| Baret (1905) |
| Baret (1905) |
- Provence-Alpes-Côte d'Azur
| Fröhlich et al. (2001) |
| Chollet Pascal Collection |
| S. MAURY (S) |
| [Opal-A var: Opal-AN] MAURY (S) |
| MAURY (S) |
| F. Roulin et al. |
| [Hey p438] |
| [Opal-A var: Opal-AN] collection Joachim Esche |
|
Georgia | |
| Alexander G. Tvalchrelidze (2003) |
| Ramaz Migineishvili (2005) |
|
Germany | |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Fricke et al. (1988) |
| [Opal-A var: Opal-AN] Walenta (1992) |
| [Opal-A var: Opal-AN] Aufschluss 1988 (2) |
| [Opal-A var: Opal-AN] |
| Weiß (1990) |
| [Opal-A var: Opal-AN] Fricke et al. (1988) |
| [Opal-A var: Opal-AN] Bega photo |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Lapis 1978 (1) |
| [Opal-A var: Opal-AN] 70. +1 other reference |
| [Opal-A var: Opal-AN] Walenta (1992) |
| [Opal-A var: Opal-AN] www.mineralienatlas.de (2021) |
| [Opal-A var: Opal-AN] Schmeltzer (1993) +1 other reference |
| [Opal-A var: Opal-AN] Lapis 23 (12) |
| [Opal-A var: Opal-AN] Walenta (1992) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] 54. +1 other reference |
| [Opal-A var: Opal-AN] Walenta (1992) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Himmel et al. (1933) |
- Freyung-Grafenau District
| [Opal-A var: Opal-AN] Habel (2009) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Mineralien-Welt 18 (5) |
| Weiß (1990) |
| Weiß (1990) |
| Obermüller et al. (1993) |
| see locality page |
| [Opal-A var: Opal-AN] Wittern (2001) |
| [Opal-A var: Opal-AN] F. Müller: "Bayerns steinreiche Ecke" et al. (Hof) |
| [Opal-A var: Opal-AN] Rost (1949) |
- Wunsiedel im Fichtelgebirge
| 54. +1 other reference |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Wittern (2001) |
| F. Müller: "Bayerns steinreiche Ecke" (1984) |
- Auerbach in der Oberpfalz
| [Opal-A var: Opal-AN] Neschen (n.d.) |
| [Opal-A var: Opal-AN] Eigler et al. (1982) +1 other reference |
- Neustadt an der Waldnaab District
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Weiß (1990) |
| Weiß (1990) |
| Collection of Steffen Michalski |
| Collection of Steffen Michalski |
| [Opal-A var: Opal-AN] |
| Nickel et al. (1985) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Jordan (1803) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Collection of Volker Betz |
| Weiß (1990) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| www.zobodat.at (2022) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Ehrenberg et al. (1982) |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Weiß (1990) |
| Weiß (1990) |
| Weiß (1990) |
| [Opal-A var: Opal-AN] |
| Weiß (1990) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] |
| Weiß (1990) |
| Reinsch (1985) |
| Reinsch (1985) |
| |
| SEM-EDS and Wet Chemical by Joy Desor |
| Lapis (1) |
| 70. +1 other reference |
| Weiß (1990) |
| Haege (1887) |
| [Opal-A var: Opal-AN] Klein (1999) |
| in: Stracher +1 other reference |
| [Opal-A var: Opal-AN] Brauns (1922) |
| Brauns et al. (1922) |
| Dechen (1852) |
| Brauns et al. (1922) |
| Brauns et al. (1922) |
| Andreas Gerstenberg collection |
| Lapis (5) |
| Lapis (5) |
| Wittern (2001) |
| Wittern (2001) |
| MÜLLER (1990) |
| Weiß (1990) |
| Hentschel (1987) |
| Hentschel |
| Hentschel |
| Hentschel |
| Hentschel |
| [Opal-A var: Opal-AN] Blass et al. (VI) |
| in the collection of Christof Schäfer |
| Weiss: "Mineralienfundstellen et al. (Munich) |
| [Opal-A var: Opal-AN] Weiß (1990) |
| [Opal-A var: Opal-AN] Hentschel (1987) |
| [Opal-A var: Opal-AN] ko.jansen |
| [Opal-A var: Opal-AN] Blaß et al. (2013) |
| [Opal-A var: Opal-AN] Hentschel (1987) |
| Blass |
| [Opal-A var: Opal-AN] Hentschel (1987) |
| [Opal-A var: Opal-AN] Hentschel (1987) |
| Thomas Kleser & Erwin Ecker Collections |
| Thomas Lühr |
| Thomas Lühr Collection |
| Wittern (2001) |
| Th.Lühr collection |
| Wittern (2001) |
| Wittern (2001) |
| Lapis 17 (12) |
| Wittern (2001) |
| Wittern (2001) |
| Lapis (4) |
| Gröbner J. +1 other reference |
| Wittern (2001) |
| Frenzel (1874) |
| Tröger (2009) |
| Lapis 33 (10) |
| Frenzel (1874) |
| Wittern (2001) |
| Lapis 30 (7/8) |
| Wittern (2001) |
| Andreas Gerstenberg collection |
| [Opal-A var: Opal-AN] www.minmax.net |
| Witzke et al. (2013) |
| [Opal-A var: Opal-AN] T. Witzke & T. Giesler (1993) |
| August Frenzel (1874) |
| Wittern (2001) |
| Lapis 11 (7/8) |
| Vollstädt (1979) |
| H. Vollstädt et al. (Dresden) |
- Sächsische Schweiz-Osterzgebirge
| Mineralien-Welt (2) |
| Lapis (7/8) |
| [Opal-A var: Opal-AN] Gröbner et al. (2007) +1 other reference |
| Wittern (2001) |
| 54. +1 other reference |
| Wittern (2001) |
|
Greece | |
- Agios Konstantinos (Kamariza)
| [Opal-A var: Opal-AN] Ritter (1978) |
- Paliokamariza Mines (Paleokamariza Mines)
| [Opal-A var: Opal-AN] Branko Rieck collection |
| Sideridis et al. (2022) |
| Sideridis et al. (2022) |
- Eastern Macedonia and Thrace
| Voudouris et al. (2007) |
| Voudouris (2005) +1 other reference |
| Stamatakis et al. (1993) |
| Bourli et al. (2021) |
| [Opal-A var: Opal-AN] Christophos |
| Helvaci et al. (1993) |
| Econ Geol (1989) |
| Godelitsas +1 other reference |
| [Opal-A var: Opal-AN] |
| Balić-Žunić et al. (2016) |
| Kilias et al. (2001) |
| Balić-Žunić et al. (2016) |
| M.G. Stamatakis (2001) |
| Pe-Piper et al. (2021) |
|
Greenland | |
| Petersen et al. (2005) |
| Knut Eldjarn Collection |
| Petersen et al. (2002) |
| Bøggild (1953) |
|
Honduras | |
| |
- Gracias a Dios Department
| Rob Lavinsky specimen |
| Prüfer (2002) |
| Wayne Osborne Collection |
| N. Jb. Mineral. Abh. 186 (2009) |
| Sinkankas (1976) |
| Sinkankas (1976) |
|
Hungary | |
| |
- Borsod-Abaúj-Zemplén County
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| Szakáll: Topographia Mineralogica ... |
| |
| Szakáll & Gatter: Hungarian Mineral ... |
| |
| |
| Szakáll & Jánosi : Minerals of Hungary |
| Szakáll et al. (1996) |
| [Opal-A var: Opal-AN] |
| Szakáll et al. (1996) |
| [Opal-A var: Opal-AN] Koch: Minerals of Hungary |
| Szakáll & Weiszburg: Telkibánya ( Top. Min. Hun.) |
| Mineral Species of Hungary |
| Topographia Mineralogica Hungariae II. ... |
| |
| Szakáll & Weiszburg: Telkibánya |
| |
| |
| [Opal-A var: Opal-AN] Szakáll-Weiszburg: Telkibánya |
| Szakáll-Gatter: Hungarian Mineral ... |
| Szakáll et al. (1996) |
| Szakáll et al. (1996) |
| |
| [Opal-A var: Opal-AN] |
| |
| Szakáll & Gatter: Hungarian Mineral ... |
| Koch: Minerals of Hungary |
| |
| |
| Koch: Minerals of Hungary |
| Szakáll et al. (1996) |
| |
| Collection of Gábor _Mesics |
| Szakáll et al. (1996) |
| Szakáll et al. (1996) |
| |
| Szakáll et al. (1996) |
| [Opal-A var: Opal-AN] Szakáll et al. (1996) |
| Szakáll & Gatter: Hungarian Mineral ... |
| [Opal-A var: Opal-AN] Szakáll: Top.Min. Hun. |
| Szakáll: Minerals of Szerencsi Hills (Top. Min. Hun.) |
| Society of Economic Geologists Student Chapter University of Miskolc (2018) |
| [Opal-A var: Opal-AN] |
| |
| |
| [Opal-A var: Opal-AN] Betts (n.d.) |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| Szakáll: Mineralogica Topographia ... |
| Szakáll:Top. Min. Hun. |
| Szakáll:100 Hungarian Mineral ... |
| [Opal-A var: Opal-AN] Szakáll: Topographia Mineralogica ... |
| Szakáll et al. (1996) |
| Koch:Minerals of Hungary |
| |
| [Opal-A var: Opal-AN] geomania.hu (2011) |
| Szakáll-Gatter-Szendrei: Minerals of ... |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] www.geomania.hu (2013) |
| Koch: Minerals of Hungary |
| Koch: Minerals of Hungary |
| Szakáll & Jánosi: Minerals of Hungary |
| Szakáll: 100 Hungarian Mineral Locality |
| Szakáll et al. (1996) |
| GEODA 2004 |
| Mineral Species of Hungary |
| |
| |
| GEODA 2002 |
| Szakáll-Jánosi: Minerals of Hungary |
| [Opal-A var: Opal-AN] Own found |
| Book: 100 collecting sites of Hungary |
| www.geomania.hu (2013) |
| [Opal-A var: Opal-AN] www.geomania.hu (2013) |
| [Opal-A var: Opal-AN] Szakáll-Gatter-Szendrei: Hungarian ... |
| |
| [Opal-A var: Opal-AN] geomania.hu (2013) |
| |
| [Opal-A var: Opal-AN] Körmendy Regina (2011) |
| MAMIT |
| [Opal-A var: Opal-AN] T Ungvári collection |
| Geoda |
| Szakáll-Jánosi: Minerals of Hungary |
| [Opal-A var: Opal-AN] GEODA/2000 |
| [Opal-A var: Opal-AN] www.geomania.hu (2013) |
| GEODA/1997 |
| Szakáll-Gatter: Hungarian Mineral ... |
| [Opal-A var: Opal-AN] Dávid Szabó |
| www.mineral.hermuz.hu (2003) |
| Szakáll et al. (1996) |
| GEODA/2005 |
| Szakáll-Jánosi: Minerals of Hungary |
| [Opal-A var: Opal-AN] Szakáll - Gatter: Minerals of Hungary |
| Szakáll et al. (1996) |
| C. Lemanski (re-entry of lost Mindat data) |
| [Opal-A var: Opal-AN] |
| Mineral Species of Hungary |
| |
| Szakáll et al. (1996) |
| GEODA 2004 |
| Szakáll et al. (1996) |
| GEODA 2004 |
| Szakáll: 100 Hungarian Mineral Locality |
| |
| Szakáll: 100 Hungarian Mineral Locality |
| Sándor Szakáll (2004) |
| Kiss et al. (2006) |
| Szakáll et al. (1996) |
| Szakáll & Jánosi: Minerals of Hungary |
| Bortolozzi (n.d.) |
| Szakáll et al. (1996) |
| Koch: Minerals of Hungary |
| Koch: Minerals of Hungary |
|
Iceland | |
| Betz (1981) |
- Námaskarð Geothermal Area
| Mineralogy and bulk geochemistry of a ... |
- Haukadalur geothermal area
| Jones et al. (2007) |
- Vestmannaeyjar archipelago (Westman islands)
| Balić-Žunić et al. (2016) |
| Jakobsson et al. (1992) |
| JAKOBSSON et al. (1986) +1 other reference |
|
India | |
| Rocks & Min.: 8:7. |
| S. G. Tenainkai et al. (1991) |
| Philip Bluemner Collection |
| Gotze +7 other references |
| White (2008) |
|
Indian Ocean | |
| Wang et al. (2017) |
| Wang et al. (2017) |
| Wang et al. (2018) |
- Ninety East Ridge (90° E Ridge; Indian Ridge)
| D. Besse et al. |
| Linsy et al. (2023) |
| Wang et al. (2018) |
|
Indonesia | |
| [Opal-A var: Opal-AN] Rod Martin personal collection |
| Extra Lapis - English No. 10 Opal +1 other reference |
| Collection of Alex Earl |
- Rejang Lebong District (Rediang Lebong District)
| Barton et al. (1978) |
- Central Sulawesi Province
| Syafrizal et al. (2017) |
| Lowenstern et al. (2018) |
| Sujatmiko et al. (2007) |
- Gunung Bijih District (Grasberg District)
| Prendergast (2003) |
| Mazot et al. (2007) |
|
Iran | |
| Bazargani-Guilani et al. (2004) |
|
Israel | |
| Weiner et al. (1993) |
- Northern District (HaZafon District)
| |
| Cowgill (1989) |
- Southern District (HaDarom District)
| Allan W. Eckert (1997) |
| Kruszewski et al. (2021) |
| www.mineralmundi.com +1 other reference |
| Sokol et al. (2014, November) |
| |
|
Italy | |
| Bortolozzi (n.d.) |
- Metropolitan City of Reggio Calabria
| [Opal-A var: Opal-AN] samples in Messina University and ... |
| [Opal-A var: Opal-AN] Messina University collection +1 other reference |
| Russo et al. (2017) |
| Russo M. (1984) |
| Pichler et al. (1970) |
| Russo et al. (2017) |
| Parascandola (1959) |
| Russo +1 other reference |
| Russo et al. (2004) +1 other reference |
| Pelloux (1927) +7 other references |
| Russo et al. (2011) +1 other reference |
| Campostrini et al. (2019) |
- Metropolitan City of Bologna
| Milani et al. (2016) |
| www.mineralimodenesi.it (n.d.) |
| ADORNI F. (1997) |
| Adorni F. (1997) |
| Adorni et al. (2004) |
| Adorni et al. (2004) |
| Bombicci (1894) |
| Bortolozzi (n.d.) +1 other reference |
| E. Passaglia et al. |
- Metropolitan City of Rome Capital
| Federico M. |
| Negretti +2 other references |
| I minerali del Museo Archeominerario "Klitsche de la Grange"Allumiere (2000) |
| [Opal-A var: Opal-AN] Napoleoni et al. (2021) |
| [Opal-A var: Opal-AN] Napoleoni et al. (2021) |
| De Michele (1974) |
| Eur. J. Mineral. |
- Laghetto (Laghetto di Montecompatri)
| Carlini et al. (2018) |
| Carlini et al. (2018) |
| Bortolozzi (n.d.) +1 other reference |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Di Domenico Dario |
| [Opal-A var: Opal-AN] Passaglia et al. (1982) |
| Bortolozzi (n.d.) |
| Giuseppe Pipino - L'antica miniera di ... |
| Antofilli |
| Antofilli |
| Bortolozzi (n.d.) |
| 415. +1 other reference |
| Bortolozzi (n.d.) |
| Redazione (2005) |
| probed by Balestra C. |
| Antofilli et al. (1985) |
| Maida (2002) |
| Barelli (1835) +1 other reference |
| Barelli (1835) +1 other reference |
| Bedognè (1991) |
| |
| [Opal-A var: Opal-AN] Tabacchi C. (1974) +1 other reference |
| Ghizzoni et al. (2005) |
| Romani et al. (1997) +1 other reference |
| Boscardin M. (1972) +1 other reference |
| capponi Fulvio Piero collection. ... |
| [Opal-A var: Opal-AN] Fabio Brignoli collection |
| - (as a monograph) +2 other references |
| - (as a monograph) +2 other references |
| Bertolani et al. (1976) +1 other reference |
| Del Caldo et al. (1973) +1 other reference |
| Cortesogno L. |
| Piccoli et al. (2007) |
| Martini et al. (2012) |
| Martini et al. (2012) |
| De Michele (1974) |
| Bruno Marello find & collection |
| Bruno Marello find & collection |
| Piccoli et al. (2007) +1 other reference |
| Cámara et al. (2017) |
- Metropolitan City of Turin
| Prete (1995) |
| Marinai & Scaini +1 other reference |
| Piccoli et al. (2007) |
| Jervis (1873) +7 other references |
| Sanero (1932) |
| Parona (1892) +1 other reference |
| Alessandro Cantamessa find & collection |
| Fenoglio et al. (1941) |
| Collection Giuseppe Finello |
| Ambrino et al. (2009) |
| Curlo (1929) |
| Jervis (1873) +7 other references |
| Colomba (1900) +2 other references |
| Piccoli et al. (2007) |
| Gennaro (1931) +1 other reference |
| Airaudi et al. (2009) |
| [Opal-A var: Opal-AN] Mariani P. |
- Verbano-Cusio-Ossola Province
| [Opal-A var: Opal-AN] Albertini (1983) |
| Piccoli et al. (2007) |
| Piccoli et al. (2007) |
| Mattioli V. (1979) +1 other reference |
| Piccoli et al. (2007) |
| Boscardin et al. (2013) |
| Roggiani A.G. (1969) +2 other references |
| Mattioli V. (1979) +1 other reference |
| Rivista Mineralogica Italiana (1) |
| Albertini (2000) |
| Piccoli et al. (2007) |
| Piccoli et al. (2007) |
| [Opal-A var: Opal-AN] De Michele (1974) |
| [Opal-A var: Opal-AN] De Michele (1974) |
| Mattioli (1976) |
- Metropolitan City of Cagliari
| Olmi F. |
| Vasco Trancoso collection |
| Conti-Vecchi et al. (1991) |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Gamboni et al. (2006) |
| Ghiara M.R. et al. (1999) |
| Gamboni et al. (2012) |
| S. Cuccuru (2011) |
| Gamboni et al. (1997) |
| Gamboni et al. (1996) |
| Billows (1941) |
| • Gamboni et al. (1997) +1 other reference |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Gamboni A. |
| [Opal-A var: Opal-AN] Antonio Gamboni collection |
| Conti-Vecchi et al. (1991) |
| Gamboni et al. (2015) |
| Gamboni et al. (1998) |
| Gamboni et al. (2001) |
- Giogantinu and Balistreri Peaks
| Gamboni et al. (2006) |
| Bortolozzi (n.d.) |
| Fernando Caboni et al. (2024) |
| Fernando Caboni et al. (2024) |
| Stara et al. (1996) |
| [Opal-A var: Opal-AN] Conti-Vecchi G. Stara P. (1991) |
| Stara et al. (1993) |
| Stara P. (1990) |
| [Opal-A var: Opal-AN] Chinellato Matteo and Michael C. Roarke ... |
| Friedel (1890) +1 other reference |
- Metropolitan City of Catania
| [Opal-A var: Opal-AN] Sergio Russo Collection |
- Metropolitan City of Messina
- Eolie Islands (Aeolian Islands)
| Russo (2006) |
| Russo (2006) |
| Russo (2006) +1 other reference |
| PANICHI U. (1924) |
| PANICHI U. (1913) |
| P.Forti (1994) |
| Honnorez et al. (1971) +1 other reference |
| PANICHI U. (1924) |
| Jervis G. (1881) +1 other reference |
- Trentino-Alto Adige (Trentino-South Tyrol)
- Trento Province (Trentino)
| Bortolozzi (n.d.) |
| Ferretti et al. (2018) |
| Ferretti et al. (2015) |
| Ferretti et al. (2008) |
| Bortolozzi (n.d.) |
| Exel (1987) |
| A.Costantini (2015) |
| |
| Biagioni et al. (2013) |
| Nannoni et al. (2008) |
| [Opal-A var: Opal-AN] Orlandi et al. (1997) |
| [Opal-A var: Opal-AN] Barsotti et al. (2006) |
| [Opal-A var: Opal-AN] Orlandi et al. (1997) |
| Giuliano bettini collection |
| G. Cocco et al. (Elba) |
| |
| Bonifazi (2020) |
| Sammartino (2013-2014) |
| Sammartino et al. (2011-2012) +1 other reference |
| Bonifazi (2020) |
| Sammartino et al. (2011-2012) +1 other reference |
| Bonifazi (2020) |
| LIBVRNA N°2 September 2021 |
| E. Manasse (Isola d'Elba) |
| Barsotti et al. (2006) |
| Ref.: Sammartino F. |
| Bonifazi (2020) |
| Sartori F. (1967) |
| Bonifazi (2020) |
| Rielli et al. (2022) |
| Lenzi (1996) +1 other reference |
| Bonifazi (2020) |
| parcoculturaledicamaiano.toscana.it (2016) |
| parcoculturaledicamaiano.toscana.it (2016) |
| Sammartino (2014) |
| Barsanti M. |
| • Biagioni et al. (2008) |
- Miseglia quarrying basin (Miseglia-Fantiscritti quarrying basin; Fantiscritti quarrying basin)
| Bonaccorsi et al. (2007) |
- Metropolitan City of Florence
| · Betti et al. (2017) |
| Betti et al. (2017) |
| Brizzi G. et al. (FI) |
| Brizzi G. et al. (FI) |
| · Betti et al. (2017) |
| · Betti et al. (2017) |
- Montecatini Val di Cecina
| Ricci et al. (2021) |
| Nannoni |
| Brizzi G. (1988) |
| Orlandi P. (2005) |
| Orlandi P. (2005) |
| Brizzi G. et al. (1996) |
| Menchetti et al. (2015) |
| R. Meli (1999) |
| Hollis et al. (2021) |
| Stoppa F. et al. (2010) |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
| Fabris et al. (2014) |
| Fabris et al. (2014) |
| Lapis (12) |
| Boscardin M. et al. (Vicenza) |
| Bortolozzi (n.d.) |
| Bortolozzi (n.d.) |
|
Japan | |
| T. Nakanishi et al. (2003) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| H. Imai collection. +1 other reference |
| Imaoka et al. (2021) |
| [Opal-A var: Opal-AN] Uehara et al. (2014) |
| Chishitsu Chousajo (1902) |
| Masutomi Museum specimen (Kyoto) |
| Chishitsu Chousajo (1902) |
| specimens in several Japanese museums ... |
| [Opal-A var: Opal-AN] Alfredo Petrov collection. |
| [Opal-A var: Opal-AN] Alfredo Petrov |
| Mineralogical Journal Vol. 20 (1998) |
| [Opal-A var: Opal-AN] Alfredo Petrov specimens |
| Takeo Kato et al. (1934) |
- Atosanupuri volcano (Iou-zan; Mount Iwo)
| Katsui (1962) |
| Katsu Kaneko (1956) |
| Suzuki (1957) |
| Amir Akhavan Collection |
| [Opal-A var: Opal-AN] Alfredo Petrov specimens |
| Chishitsu Chousajo (1902) |
| Sadanaga et al. (1974) |
| Dr Yohachiro Okamoto (1876-1960) +1 other reference |
| Hiroaki Tano specimens |
| Hiroaki Tano's specimen |
| Takeo Kato et al. (1934) +1 other reference |
| Watanabe (1959) |
| Fulin Zhang et al. (1986) |
| S. Hamasaki (2002) |
| Amir Akhavan Collection |
| Amir Akhavan Collection |
| S. Hamasaki (2002) |
| |
| Amir Akhavan Collection |
| |
| Alfredo Petrov collection |
| Kaneko (1956) |
| IMAI et al. (2000) |
| Kimura et al. (1982) |
| Dr. Matsuo Nambu collection (curated at Geological Survey of Japan) |
| Seki et al. (1968) |
| H. Minato (1953) |
| Dr Yohachiro Okamoto (1876-1960) |
| Geology and Mineral Resources of Japan (Geological Survey of Japan, 1960) |
| 29:179-186 +1 other reference |
| Yamada (2004) |
| H. Momoi (1964) |
| [Opal-A var: Opal-AN] Miyawaki et al. (2003) |
| [Opal-A var: Opal-AN] Miyawaki et al. (2000) |
| Katsu Kaneko (1956) |
| [Opal-A var: Opal-AN] Nakatsugawa Mineral Museum (Gifu Prefecture, Japan) |
| Hiroaki Tano's collection |
| - (unpublished species lists maintained by local collectors) +1 other reference |
| Alfredo Petrov - field observations |
| [Opal-A var: Opal-AN] field collected by Alfredo Petrov |
- Chichi Island (Chichijima)
| Mineralogical Journal Vol. 11 (1982) |
| Mineralogical Journal Vol. 11 (1982) |
- Iwo Jima (Iou-to; Iou Island; Iwojima; Iou-jima; Naka-Iou-jima)
| Gordon A. MacDonald (1948) |
| Chishitsu Chousajo (1902) |
| Mizota (1969) |
| Dr Yohachiro Okamoto (1876-1960) |
| Chishitsu Chousajo (1902) |
|
Jordan | |
| Pitty et al. (2010) |
| Sokol +9 other references |
| Khoury et al. (1985) |
|
Kazakhstan | |
- Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
| Bailey |
| Абдуллин et al. (2013) |
| Абдуллин et al. (2013) |
| Korobkin et al. (2022) |
| Bespaev H.A. et al. (Almaty, 1999) |
| Oleg Lopatkin collection |
| Bespaev H.A. et al. (Almaty, 1999) |
| Ermilova et al. (1961) +1 other reference |
| Pekov (1998) |
| Pavel.M. Kartashov (n.d.) |
| According reports of geological service ... |
| Bespaev et al. (2001) |
| Pekov (1998) |
| Levin et al. (2021) |
| Gems of Kazakhstan et al. (in Rus.) |
|
Kenya | |
| Owen et al. (2008) |
- Mount Suswa (Suswa Volcano)
| Forti et al. (2004) |
| Forti et al. (2003) |
| Forti et al. (2003) |
|
Kosovo | |
| Mineral deposits and mining districts ... +2 other references |
| Vanrusselt (2023) |
- Çikatovë e Vjetër (Cikatovo)
| Mineral deposits and mining districts ... |
| Miladinovic et al. (2016) |
| Ilich et al. (2002) +1 other reference |
|
Libya | |
| Robert D. Crangle (2008) |
|
Madagascar | |
| Behier (1963) |
- Ambatofinandrahana District
| Knut Eldjarn specimen & photo |
| Pezzotta (1996) |
| Behier (1963) |
| Ranorosoa (1986) |
| Lacroix (1899) |
| Behier (1963) |
| Besaire (1966) |
| Behier (1963) |
| Michel Arliguie photo and specimen |
| Eliana Intruglio's mineral collection |
| Popov et al. (2020) |
| Behier (1963) |
| Lacroix (1922) |
| Behier (1963) |
| Simoni et al. (2010) |
| [Opal-A var: Opal-AN] Knut Edvard Larsen collection # M-190 |
| [Opal-A var: Opal-AN] Knut Edvard Larsen collection |
| Ranorosoa (1986) |
| Behier (1963) |
| Behier (1963) |
| Behier (1963) |
|
Malaysia | |
| Yajima (1960) |
| Bridge et al. (1983) |
|
Mali | |
| |
|
Marshall Islands | |
| Rex (1967) |
|
Mauritania | |
| Marsh et al. (2015) |
|
Mexico | |
| |
| Rob Lavinsky |
| RODRIGUEZ-DIAZ |
| Canet et al. (2005) +1 other reference |
| Mason (1976) |
| Megaw (2023) |
| Cross (2006) |
| three genetic models. Economic Geology: 86 (2) +1 other reference |
| Econ Geol (1991) +3 other references |
| Sotelo (2016) |
- Manuel Benavides Municipality
| Hewitt |
| Mineralium Deposita (2009) |
| Gazquez et al. (1) |
- Cuatro Ciénegas Municipality
- Cuatro Ciénegas (Cuatrociénegas de Carranza; Venustiano Carranza)
| Forti (2006) |
- Sierra Mojada Municipality
| [Opal-A var: Opal-AN] Panczner (1987) |
- Coneto de Comonfort Municipality
- América-Sapioris District (Potrillos)
| [Opal-A var: Opal-AN] Yves Masson photo |
| |
| [Opal-A var: Opal-AN] |
| Hyrśl (2012) |
| Panczner (1987) |
- Pánuco de Coronado Municipality
| [AmMin 85:263] |
| Panczner (1987) |
| Panczner (1987) |
- Santa Catarina Municipality
| Am Min (1955) +1 other reference |
| Mason (1976) |
| |
| Panczner (1987) |
| Mason (1976) |
| Panczner (1987) |
| Panczner (1987) |
| |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) |
| Panczner (1987) |
- San Cristóbal de la Barranca
| Panczner (1987) |
| Panczner (1987) |
| Curtis +3 other references |
- Temascaltepec Municipality
- Temascaltepec de González (Temascaltepec)
| Camprubi |
| Fritsch et al. (2004) |
| Panczner (1987) |
| Panczner (1987) |
- Ixtacamaxtitlán Municipality
| Tritlla et al. (2004) |
| Tritlla J. et al. (Puebla state, Mexico) |
| Mason (1976) |
| Panczner (1987) |
| |
- Ezequiel Montes Municipality
| Panczner (1987) |
| |
- Tequisquiapan Municipality
| Gübelin (1985) |
| [Opal-A var: Opal-AN] |
- Mexquitic de Carmona Municipality
| [Opal-A var: Opal-AN] Cook (2013) |
- Villa de Arriaga Municipality
| [Opal-A var: Opal-AN] various added photos |
- Villa de Reyes Municipality
| Panczner (1987) |
| Carles Curto specimen |
| Porras-Toribio et al. (2022) |
| [Opal-A var: Opal-AN] King (n.d.) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
|
Middle East | |
| Gross (1977) |
|
Mongolia | |
| Pavel.M. Kartashov (n.d.) |
| Kynicky et al. (2011) |
|
Morocco | |
| Jewel Tunnel specimens obtained by Rock ... |
| [Opal-A var: Opal-AN] Samira |
| Favreau et al. (2006) |
| Favreau et al. (2006) |
| FAVREAU G. & DIETRICH J.E. (2006) |
- El Kelaâ des Sraghna Province
| On quartz specimens field-collected by ... |
|
Myanmar | |
- Tigyaing Township (Htigyaing Township)
| Harald Schillhammer collection |
|
Namibia | |
| - (n.d.) |
| Cairncross (2005) |
| [Opal-A var: Opal-AN] Schnaitmann et al. (2007) |
| [Opal-A var: Opal-AN] MinRec |
| [Opal-A var: Opal-AN] E. Schnaitmann et al. (2008) |
| |
| Jahn et al. (2006) |
| von Bezing (2007) |
| Wartha et al. (2001) +1 other reference |
| von Bezing (2007) |
| Saphira Minerals specimens |
| Gerhard Louw photo ID 983450 |
| [Opal-A var: Opal-AN] von Bezing (2007) |
|
New Zealand | |
| [Opal-A var: Opal-AN] Rod Martin personal collection |
| Rod Martin Collection |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| [Opal-A var: Opal-AN] Rod Martin Collection |
| Schwarz-Schampera et al. (2007) |
| Milicich +1 other reference |
| NZJGG |
| NZJGG |
| Collection of RJ Martin |
| Rod Martin Collection |
| Collection of RJ Martin |
| Tim Saunderson collection |
| Collection of Rod Martin |
| Martin et al. (1999) |
| Jones et al. (2006) |
| Jones et al. (2005) |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| Collection of RJ Martin |
| [Opal-A var: Opal-AN] Judy Rowe collection |
| Collection of RJ Martin |
| [Opal-A var: Opal-AN] Judy Rowe collection |
- Central Hawke's Bay District
| Nyman |
- Manawatu-Whanganui Region
| [Opal-A var: Opal-AN] Judy Rowe and Alfredo Petrov specimens |
| Johnstone (1979) |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
- New Zealand Outlying Islands
| de Ronde +17 other references |
| Sutherland et al. (ed.) |
| Mason (1957) |
| Collection of RJ Martin |
| Hampton et al. (2004) |
| Gary Leske specimen |
| Aurora Minerals |
| Collection of RJ Martin |
| [Opal-A var: Opal-AN] Judy Rowe collection |
| Collection of RJ Martin (initial ID by S Courtney, Univ of Auck) |
| Collection of RJ Martin |
| [Opal-A var: Opal-AN] Knut Edvard Larsen collection # MM- 3930 (collected by Dick Dufton) |
| Collection of RJ Martin (initial ID by S Courtney, Univ of Auck) |
| [Opal-A var: Opal-AN] Old Mill or Dog Pound Quarry et al. (NZ) |
| Collection of RJ Martin |
| Collection of RJ Martin |
| Zuquim et al. (2012) |
| Tim Saunderson collection |
| Collection of Rod Martin |
| Milicich +1 other reference |
| Brathwaite et al. (2021) |
| Collection of RJ Martin |
- Orakeikorako Thermal Area (Orakei Korako; The Hidden Valley)
| Rod Martin et al. (NZ) +1 other reference |
| [Opal-A var: Opal-AN] Rod Martin personal collection |
| [Opal-A var: Opal-AN] Brotheridge et al. (1995) |
| Tschernich (1992) |
- Thames-Coromandel District
| Moore (1979) |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| Collection of RJ Martin |
| L. D. Swindale & I. R. Hughes (1968) |
| Collection of RJ Martin |
| CF Johnson collection +1 other reference |
|
North Macedonia | |
- Cheshinovo-Obleshevo Municipality
| opal +1 other reference |
| Hiessleitner (1931) |
- Kratovo-Zletovo ore district
| Serafimovski et al. (2015) |
| Radusinovic (1974) |
| Serafimovski et al. (2015) |
| Spasovski et al. (2009) |
| Spasovski et al. (2009) |
|
Norway | |
| [Opal-A var: Opal-AN] Revheim (2004) |
| [Opal-A var: Opal-AN] Nordli et al. (1997) +1 other reference |
| Berg (198?) |
| Knut Edvard Larsen collection and ... |
| [Opal-A var: Opal-AN] Hurum (2004) |
| [Opal-A var: Opal-AN] Larsen et al. (2004) |
| [Opal-A var: Opal-AN] Nordrum (2007) |
| Knut Eldjarn Collection |
| Nordrum et al. (1999) |
| Husdal (2008) |
| Kvamsdal (1998) |
| Kvamsdal (1999) |
| Raade et al. (2000) |
| Peter Andresen observation oct.2003 |
| Berge (n.d.) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| Jamtveit et al. (1997) |
| [Opal-A var: Opal-AN] Witsø (1995) |
| [Opal-A var: Opal-AN] www.strahlen.org (n.d.) |
| [Opal-A var: Opal-AN] Witsø (1995) |
| [Opal-A var: Opal-AN] Witsø (1995) +1 other reference |
| [Opal-A var: Opal-AN] Nordrum (2012) |
| Kvamsdal (1998) |
| [Opal-A var: Opal-AN] Nordrum et al. (1997) +1 other reference |
| [Opal-A var: Opal-AN] Nordrum (2012) |
| Knut Eldjarn Collection |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| [Opal-A var: Opal-AN] Larsen et al. (2009) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| Berge (1993) +1 other reference |
| Field observarions by Peter Andresen |
| Fredholm (1874) +1 other reference |
| [Opal-A var: Opal-AN] Andresen et al. (2018) |
| [Opal-A var: Opal-AN] Atle Michalsen collection |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| Engvoldsen et al. (1991) |
| Larsen et al. (2010) |
| Engvoldsen et al. (1991) |
| Berge et al. (1980) +1 other reference |
| [Opal-A var: Opal-AN] Larsen et al. (2012) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| [Opal-A var: Opal-AN] Berge (n.d.) |
| Engvoldsen et al. (1991) |
| Berge et al. (2011) |
| Berge (2013) |
| Engvoldsen et al. (1991) |
| Andersen et al. (1994) |
| Larsen et al. (2013) |
| Nordrum (2015) |
| Knut Eldjarn Collection |
| Stensrud (2004) |
| [Opal-A var: Opal-AN] Knut Edvard Larsen MM-collection (#1089) |
| Stensrud (2004) |
| Kvamsdal et al. (2006) |
| Raade et al. (1982) |
| Kvamsdal (1993) |
| Kvamsdal (2018) |
| Kvamsdal (1998) |
|
Oman | |
| |
|
Pacific Ocean | |
| Econ Geol (1985) |
| Markov et al. (2002) |
- South California Borderland
| Hein et al. (2010) |
| Schwarz-Schampera et al. (2007) |
| Mozgova et al. (1993) +1 other reference |
|
Pakistan | |
| [Opal-A var: Opal-AN] Jose Zendrera specimen |
| Jose Zendrera Collection |
| Ikram Mineralogy |
| [Opal-A var: Opal-AN] imported from Rondu District +1 other reference |
|
Panama | |
| Byington |
|
Papua New Guinea | |
| New Data on Minerals (2004) |
| Binns (2014) |
| Zhigang Zeng et al. (12) |
- Fergusson Island (Moratau)
| Province et al. (2004) |
| Province et al. (2004) |
| Econ Geol (1984) |
| www.portergeo.com.au (2002) |
|
Paraguay | |
| Alfredo Petrov field observations |
|
Peru | |
| Hyrśl (2012) |
| Hyrsl et al. (2003) |
| Hyrśl (2012) |
| Rob Lavinsky specimen |
| Dill et al. (1997) |
| [Opal-A var: Opal-AN] Extra Lapis - English No. 10 Opal |
| |
| Hyrśl (2012) |
| Jacques Valverde self collecting (summer 2007) +1 other reference |
|
Poland | |
- Lower Silesian Voivodeship
| Lis et al. (1986) |
| Jahrbuch der Königlich Preussischen ... +1 other reference |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Jäkel [F.W.?] (1853) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Heflik W. et al. (1993) |
| Heflik W. et al. (1993) |
| Gil et al. (2019) |
| Krzysztof Andrzejewski |
| Leopold von Buch 1802 - Geognostische ... +3 other references |
| Weigel J.A.V. (1800) |
| Adamczyk Z. (2008) |
| Lis et al. (1986) |
| Schumacher K. (1878) +1 other reference |
| Lis et al. (1986) |
| Harańczyk C. (1974) |
| Glocker E.F. (1829) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| [Opal-A var: Opal-AN] Szełęg |
| Lis et al. (1986) |
| [Opal-A var: Opal-AN] DUBIŃSKA E. et al. (Nasławice, Lower Silesia, Poland) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Traube (1888) |
| Lehmann J.G. (1755) |
| Michael W. Kieron collection |
| Alfredo Petrov specimen +1 other reference |
| Spangenberg et al. (1949) |
| Spangenberg et al. (1949) |
| University of Adelaide +1 other reference |
| Kuhn et al. (1918) |
| Trippke (1878) |
| [Opal-AN var: Hyalite] Roemer (1870) |
| Traube (1888) |
| Ł. Kruszewski EPMA/PXRD data +1 other reference |
| Kruszewski et al. (2019) |
- Subcarpathian Voivodeship
| Personally collected by Zając Piotr in ... |
|
Portugal | |
| [Opal-A var: Opal-AN] Marques de Sá et al. (2010) |
| Museu Nacional de História Natural e ... |
| Lavarde et al. (2019) |
| Forti (2005) +1 other reference |
| Daza et al. (2014) |
| Pedro Alves collection and analytical ... |
| [Opal-A var: Opal-AN] Alves et al. (2017) |
- Vila Nova de São Bento e Vale de Vargo
| [Opal-A var: Opal-AN] Pedro Alves collection |
| Rui Nunes |
| Rui Nunes collection |
| Rui Nunes collection |
| [Opal-A var: Opal-AN] Martins da Pedra collection |
| [Opal-A var: Opal-AN] Rui Nunes collection 2012 |
| [Opal-A var: Opal-AN] Pedro Alves collection and analytical ... |
| [Opal-A var: Opal-AN] Tiago Guia's mineral collection (self-collected) |
| [Opal-A var: Opal-AN] Pedro Alves collection |
- Malpartida e Vale de Coelha
| [Opal-A var: Opal-AN] Felix Garcia Garcia Mineral Collection |
| [Opal-A var: Opal-AN] Guilherme Pedrosa collection |
| LNEG - Laboratório Nacional de Energia ... |
| Direcção Geral de Minas |
| Rui Nunes |
- Santa Maria e São Pedro e Sobral da Lagoa
| Rui Nunes 2012 |
| Pedro Alves collection and analytical ... |
| Rui Nunes 2011 |
| [Opal-A var: Opal-AN] Rui Nunes 2011 |
| Martins da Pedra collection |
| Rui Nunes 2011 |
| Rui Nunes 2011 |
| LNEG - Siorminp |
| LNEG - Siorminp database information |
| [Opal-A var: Opal-AN] Pedro Alves collection +1 other reference |
| Martins (2018) |
| [Opal-A var: Opal-AN] |
- Tavares (Chãs; Várzea e Travanca)
| [Opal-A var: Opal-AN] Rui Nunes collection |
| [Opal-A var: Opal-AN] King (n.d.) |
- U.F Romãs Decermilo e Vila Longa
| [Opal-A var: Opal-AN] Nuno Afonso collection |
| [Opal-A var: Opal-AN] Rui Nunes' visit |
| [Opal-A var: Opal-AN] Pedro Alves collection |
| [Opal-A var: Opal-AN] Pedro Alves collection |
|
Romania | |
| Woodside collection |
| Zoltán Csata |
| Royal Ontario Museum specimen |
| Primics (1886) |
| Carpathian Journal of Earth and ... |
| Damian et al. (2008) |
| Dana |
| Marinel Kovacs et al. (Eastern Carpathians) |
| Jude Radu (2010) |
| Udubasa et al. (1996) +1 other reference |
|
Russia | |
| webmineral.ru (2020) |
| Cesnokov et al. (1998) |
| webmineral.ru (n.d.) |
- Sakhara District (Sakharinskii)
| Mikhailov (2000) |
| Pavel.M. Kartashov (n.d.) |
| webmineral.ru (2016) |
| Skovitina et al. (2014) |
| Garrett (1998) |
| webmineral.ru (2016) |
| Okrugin |
- Great Fissure eruption (Main Fracture)
- Northern Breakthrough (North Breach)
| Pekov et al. (2015) |
- Ust-Bolsheretsky District
| Frolova et al. (2010, April) +1 other reference |
| Sandimirova et al. (2014) |
| Karpov (1991) +1 other reference |
| Kirichenko et al. (2019) |
| Sergeeva et al. (2019) |
| Sergeeva et al. (2019) |
| [Der Aufschluss 1995:4 p163-180] +1 other reference |
| Bortnikova et al. (2009, February) +1 other reference |
| Frolova et al. (2010, April) |
| [Der Aufschluss 1995:4 p.163-180] +1 other reference |
| Tsekhovskii et al. (2002) |
| Filimonova et al. (2008) |
| Filimonova et al. (2010) |
| [Opal-A var: Opal-AN] Pekin et al. (2010) +1 other reference |
| Pekin et al. (2010) +1 other reference |
| Pekin et al. (2010) +1 other reference |
| Pekin et al. (2010) +1 other reference |
| Pekov et al. (2004) |
| Pavel.M. Kartashov (n.d.) |
| Pavel M. Kartashov analytical data (2013) |
| Pekov (2005) |
| Yakovenchuk et al. (2007) |
| My own collection |
| webmineral.ru (n.d.) |
| Sharkov (2009) |
- Khalilovskii massif (Khalilova)
| Mikhailov (2000) |
| Rakhimov et al. (2022) |
| Mikhailov (2000) |
| Mikhailov (2000) |
- Dalnegorsk Urban District
| Grant et al. (2001) |
| Dobovol'skaya et al. (1990) |
| Vysotskiy et al. (2010) |
| Dobrovol’skaya et al. (2008) |
| [World of Stones 12:49] |
- Upper Amga gold-mining district
| Anisimova et al. (2020) |
- Verkhneamginskaya auriferous zone
| Kasatkin et al. (2022) |
| Igor Savin data |
- Kuril Islands (Kurile Islands)
| Frolova et al. (2010, April) |
| Znamenskii V.S. et al. (1970) |
| Vergasova et al. (1977) +1 other reference |
| Shevko et al. (2018) |
| L.M. Lebedev data |
| Koichi Momma et al. (2018) |
| Koichi Momma et al. (2018) |
| Pekov (1998) |
| |
| Pekov (1998) |
| |
| [Mineralien Welt 6/92:62] |
- Yamalo-Nenets Autonomous Okrug
| Murzin et al. (2022) |
| Zueva et al. (2023) |
|
Rwanda | |
| Daltry et al. (1998) |
|
Saint Lucia | |
| A Mars Analogue Site. Masters Thesis +1 other reference |
|
Saudi Arabia | |
| Saudi Geological Survey Open-File ... |
|
Serbia | |
| Miladinovic et al. (2016) |
| Ministry of Mining and Energy (2002) |
| Miladinovic et al. (2016) |
| Ministry of Mining and Energy (2002) +1 other reference |
| Miladinovic et al. (2016) |
| doi.org (n.d.) +1 other reference |
| Miladinovic et al. (2016) |
|
Slovakia | |
| Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Mesiarkinová et al. (2009) |
| Slavkay M. (2004) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Slavkay M. (2004) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Ďuďa R. |
| [Opal-A var: Opal-AN] Pauliš |
| Kodě +1 other reference |
- Banská Štiavnica District
- Banská Belá Au-Ag deposit
| Koděra (1986) |
| [Opal-A var: Opal-AN] Lexa et al. (1999) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Lexa et al. (1999) |
| S.Šimko |
| Koděra (1986) |
| Lexa et al. (1999) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Ivanov M. (1979) |
| Rojkovičová |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Grecula |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Ďuďa (1993) |
| Daniel Ozdín collection |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Pauliš |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Uher et al. (2000) |
| Pauliš P. |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Pauliš P. |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Pauliš P. |
| Matúš Škutka |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Ozdín D. & Števko M. |
| Cílek (1999) |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Bacsó |
| Koděra (1986) |
| Matúš Škutka |
- Spišská Nová Ves District
| Koděra (1986) |
| [Opal-A var: Opal-AN] Pauliš P. |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Kaličiak |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Albert Russ specimens |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Wood Opals From Velky Dur |
| Koděra (1986) |
| Koděra (1986) |
| Pauliš |
| Koděra (1986) |
| Mason (1976) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
| [Opal-A var: Opal-AN] Personally collected by S.Šimko in 1994 |
| [Opal-A var: Opal-AN] Koděra (1986) |
| Koděra (1986) |
| Ďuďa |
| [Opal-A var: Opal-AN] Duda et. all. |
| Koděra (1986) |
| Ďuďa R. (2001) |
| [Opal-A var: Opal-AN] Pauliš |
| Koděra (1986) |
- Vranov nad Topľou District
| Koděra (1986) |
| Koděra (1986) |
| Duda et all. |
| [Opal-A var: Opal-AN] Ďuďa |
| Koděra (1986) |
| Koděra (1986) |
| [Opal-A var: Opal-AN] Slavomir ŠIMKO |
| S.Šimko |
| Gabriel Gajarsky specimen |
| Koděra (1986) |
| Koděra (1986) |
- Liptovský Mikuláš District
| Koděra (1986) |
| [Opal-A var: Opal-AN] Koděra (1986) |
- Turčianske Teplice District
| Koděra (1986) |
|
Somaliland | |
| Wolfgang Hampel specimen |
| Journal of Gemmology (2002) |
|
South Africa | |
- City of Tshwane Metropolitan Municipality
| Atanasova et al. (2016) |
- West Rand District Municipality
- Mogale City Local Municipality
| Anhaeusser et al. (1978) |
- Ugu District Municipality
| Cairncross et al. (1995) |
- Vhembe District Municipality
| Cairncross et al. (1995) |
- Waterberg District Municipality
- Modimolle-Mookgophong Local Municipality
| [Opal-A var: Opal-AN] Wolfgang R. Windisch personal list. |
- Ehlanzeni District Municipality
- Mbombela Local Municipality
| De Waal et al. (1969) |
| Martini (1997) |
- Nkangala District Municipality
- Victor Khanye Local Municipality
| Atanasova et al. (2016) |
| |
- Bojanala Platinum District Municipality
- Madibeng Local Municipality
| Atanasova et al. (2016) |
- Moses Kotane Local Municipality
- Pilanesberg Alkaline Ring Complex
| Cairncross et al. (1995) |
- John Taolo Gaetsewe District Municipality
- Joe Morolong Local Municipality
| Am Min 53:495 |
| Von Bezing (1991) |
- Namakwa District Municipality
- Khâi-Ma Local Municipality
| Cairncross et al. (1995) |
- Nama Khoi Local Municipality
| Eriksson (1997) |
| Cairncross et al. (1995) |
- ZF Mgcawu District Municipality
- Kai !Garib Local Municipality
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
- West Coast District Municipality
- Cederberg Local Municipality
| Miller et al. (2016) |
|
South Korea | |
| Kinosaki (1941) |
|
Spain | |
| Propuestas para explotación de mineral de mercurio en la Península Ibérica. Datos complementarios para la investigación en el S.E." (Madrid, 1968) |
| Calvo (2016) |
| Calvo (2016) |
| José Miguel Sola |
- Cabo de Gata volcanic complex
| Calvo Rebollar (2016) |
| Calvo Rebollar (2016) |
| Joaquim Mollfulleda |
| Calvo (2016) |
| Calvo (2016) |
| José Miguel Sola. Multiple methods |
| Romero Silva JC (2003) |
| Calvo (2008) |
| Calvo (2008) |
| Extra Lapis - English No. 10 Opal |
| María Jesús Mediavilla collection |
| Mullis et al. (1982) |
- Las Palmas de Gran Canaria
| [Opal-A var: Opal-AN] Personally collected in January 2013 +1 other reference |
| [Opal-A var: Opal-AN] Graetsch (1996) |
| [Opal-A var: Opal-AN] Zeolite collcetion of Volker Betz |
| Ternes (1995) |
| Francesco Sauro et al. (2021) +2 other references |
- Santa Cruz de Tenerife Province
| Bustillo et al. (2003) |
| Juan Miguel Casanova Honrubia ... |
| INTAN (Barcelona) |
| INTAN specimens (Barcelona) |
- Cancarix lamproite intrusion
| Juan Miguel Segura specimen |
| MTI Mineralogía Topográfica Ibérica |
| Calvo et al. (2013) |
| [Opal-A var: Opal-AN] Martins da Pedra collection |
| Fernández Macarro et al. (1988) |
| Fernández Macarro et al. (1988) |
| Jordi Fabre |
| Rosell-Riba et al. (2022) |
| Carles Curto Mila collection |
| [Opal-A var: Opal-AN] Marc C collection |
| Alfredo Petrov field observations |
- Vallès Occidental-Baix Llobregat
- Sant Cugat del Vallès-El Papiol
| |
| Mineralogistes de Catalunya (1997) |
| Bareche (2005) |
- Sant Fost de Campsentelles
| Laura Palacios Pérez |
| Joaquim Mollfulleda |
| Laura Palacios Pérez |
| Martí Rafel - Dr. Joan Viñals |
| |
| Joaquim Mollfulleda |
| Joan Abella i Creus (2008) |
| |
| |
| Garcia G. et al. (2004) |
| Geominero Museum collection |
| González del Tánago et al. (21) |
| Tanago et al. (2012) |
| Calvo (2016) |
| Bustillo et al. (2005) |
| www.foro-minerales.com (2017) |
| González del Tánago et al. (21) |
| Collection of the Geominero Museum of ... |
| González del Tánago et al. (21) |
| González del Tánago et al. (21) |
| Carlos J. Rodríguez |
| [Opal-A var: Opal-AN] Hamid +9 other references |
| Calvo et al. (2009) |
| Calvo et al. (2009) |
| Sevillano et al. (2009) |
| FMF Forum |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] |
| FMF Forum |
| Joan Rosell - RosellMinerals |
| Fuster et al. (1967) +2 other references |
| González (2023) |
| Casanova Honrubia |
|
Sri Lanka | |
| Dissanayake et al. (2000) |
|
Sweden | |
| |
| Gatedal (n.d.) |
| Swedish Nat.Museum |
| Metropolis (1988) +1 other reference |
| Knut Eldjarn Collection |
|
Switzerland | |
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
- Triebten lake (Trübten lake)
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
| [Opal-A var: Opal-AN] Stalder et al. (1998) |
| [Opal-A var: Opal-AN] |
| Schwanz (1994) |
- Mont Chemin mining district
| [Opal-A var: Opal-AN] |
| Gorsatt (Ed.) |
| [Opal-A var: Opal-AN] Cuchet et al. (2005) |
| [Opal-A var: Opal-AN] Meisser (2012) |
|
Tajikistan | |
- Altyn-Topkan ore field (Zarnisor ore field)
| Badalov et al. (1975) |
|
Tanzania | |
| |
| Schmetzer et al. (1976) |
| www.ganoksin.com (2008) |
| John A. Jaszczak collection |
| |
|
Thailand | |
- Nakhon Ratchasima Province
- Nakhon Ratchasima District
| C. Lemanski (visited, collected & photographed) |
|
Togo | |
| Wolfgang Hampel (2013) |
|
Tunisia | |
| S Tunisia +1 other reference |
|
Turkey | |
| Helvaci (1998) |
| Temel et al. (2010) |
| Helvaci +2 other references |
| A Summary and Geological Comparison. ... +1 other reference |
| Oygür (1997) |
- Sultançayırı (Sultan Tschair)
| A Summary and Geological Comparison. ... +1 other reference |
- Mustafakemalpaşa District
| A Summary and Geological Comparison. ... +1 other reference |
| Yigit (2012) |
| Yigit (2012) |
| Ercan et al. (2022) |
| Yigit (2012) |
| Akinci (2009) |
| Mineralien Welt 2001 02 p.53 |
| Ferdinando Giovine specimen |
| Yahya Çiftçi et al. (2013) |
| KARACIK +3 other references |
| Aral (1989) |
| Aral (1989) |
| Aral (1989) |
| Mutlu et al. (2005) |
| M. Hatipoglu et al. (2009) |
| Esenli et al. (2001) |
|
UK | |
| [Specimen in the Natural History Museum |
| Weiss et al. (2007) |
| Hall (1868) +1 other reference |
- South Roskear group (Pendarves Consols)
| Phillips (1823) |
| Phillips (1823) |
- Wheal Damsel United Mines
| Phillips (1823) +2 other references |
| Phillips (1823) +1 other reference |
| Paul De Bondt collection |
- Rosewarne and Herland United Mines (Rosewarne and Herland Mine; incl. Wheal Fancy; Wheal Pleasure)
| Hall (1868) |
| Golley et al. (1995) |
| Phillips (1823) |
| Reid et al. (1907) |
- Great Wheal Alfred (Alfred Consols)
| Michael W. Kieron collection |
| Henwood (1843) |
| Hall (1868) |
| P. D. Trebilcock |
| Phillips (1823) |
- Wheal Buller and Beauchamp
| Hall (1868) +1 other reference |
| Gus Horsley collection |
| Hogg (1825) +2 other references |
| Robin Selley and Roger Eslick (2004) |
| Hall (1868) +1 other reference |
| Courtenay Smale |
| P Trebilcock collection |
| |
| Collins (1871) |
| Hall (1868) +1 other reference |
| Carne (1822) |
| Reid et al. (1907) |
| Ex .C Smith collection. Geevor ... |
| Carne (1822) |
| Carne (1822) |
| P |
| P |
| Hall (1868) |
| Curtis +3 other references |
| Golley et al. (1995) |
| Alysson Rowan collection |
| Curtis +3 other references |
| |
- Carclaze China Clay Pit (Baal China Clay Pit)
| Golley et al. (1995) |
| Barstow (1982) |
| Day (1999) |
- Derbyshire Dales District
| Ford et al. (1993) |
| Ford et al. (1993) |
| Alysson Rowan collection |
| W. A. E. Usshee (1912) |
| Hall (1868) |
| Solly (1888) |
| Collection Of Bernie Millington |
| Bernie Millington Collection |
| [Opal-A var: Opal-AN] Trevor Boyd Collection |
| Greg et al. (1858) |
| James Phemister and A. G. MacGregor (1942) |
| |
| |
| S. Rust collection |
- Upper Llanfihangell-y-Creuddyn
| Rust (2019) |
|
Ukraine | |
| Volodymyr Manyuk (2008) |
- Petropavlovka Village area
| A. Tischenko. Minerals of the Crimea - ... |
| Bobrov et al. (2006, August) |
| Bailey +2 other references |
| Popov (2023) |
|
USA | |
| Barwood (1974) |
| [Opal-A var: Opal-AN] Cook et al. (1982) |
| - (2005) |
| Rocks & Min. (2007) |
| - (2008) |
| - (2008) |
- Fairbanks North Star Borough
| Eberlein et al. (1971) |
| - (2008) |
- Southeast Fairbanks Census Area
- Delta River Mining District
| - (2008) |
- Valdez Creek Mining District
| - (2008) |
- Valdez-Cordova Census Area
- Chistochina Mining District
| - (2008) |
| - (2008) |
- Cane Valley Mining District
| Reinhardt (1951) +1 other reference |
| [Opal-A var: Opal-AN] Witkind (1963) |
| Peirce (1969) +2 other references |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Eckhard D. Stuart collection |
- California Mining District (Chiricahua Mining District)
| Mary Luetcke |
| Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Luetcke (n.d.) |
| MRDS database Dep. ID file #10060237 +1 other reference |
- Dos Cabezas Mining District (Two Heads Mining District)
| Luetcke (n.d.) |
| Personally collected by bob Jackson |
- Middle Pass Mining District
| Luetcke (n.d.) |
| Luetcke (n.d.) |
| Luetcke (n.d.) |
| MRDS database Dep. ID file #10060238 |
| Luetcke (n.d.) |
| Luetcke (n.d.) |
| Luetcke (n.d.) |
- Tombstone Mining District
- Contention-Grand Central Mine group
| [Opal-A var: Opal-AN] Dana 6:1093. |
| [Opal-A var: Opal-AN] Rocks & Min.:57:12. +2 other references |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Luetcke (n.d.) |
| Williams (1981a) +1 other reference |
| Anthony et al. (1995) |
| Butler et al. (1938b) +2 other references |
| Luetcke (n.d.) |
- Turquoise Mining District (Courtland-Gleeson Mining District)
| Luetcke (n.d.) |
| Luetcke (n.d.) |
- Yellowstone Mining District
| Luetcke (n.d.) |
| Bollin et al. (1958) |
- Montezuma group of claims
| Scarborough (1981) |
| Scarborough (1981) |
- San Franciscan volcanic field (San Francisco Peaks; San Francisco Mts)
| Hanson et al. (2008) |
| Tauber (2015) |
- Globe-Miami Mining District
- Globe Hills Mining District
| MRDS database Dep. ID #10109030 |
- Miami-Inspiration Mining District
- Miami-Inspiration deposit
| Sun (1963) +1 other reference |
| [Opal-A var: Opal-AN] Granger (1969) +1 other reference |
| Bromfield (1956) |
- Sierra Ancha Mining District
- Asbestos Point (Asbestos Peak) area
| [Opal-A var: Opal-AN] Granger (1959) +1 other reference |
| [Opal-A var: Opal-AN] Granger (1959) |
| [Opal-A var: Opal-AN] Granger (1969) +1 other reference |
| [Opal-A var: Opal-AN] Granger (1959) |
| [Opal-A var: Opal-AN] Granger (1959) |
| Natkaniec-Nowak et al. (2020) |
- Lone Star Mining District (Safford Mining District; Dos Pobres Mining District)
| MRDS database Dep. ID #10060232. |
| MRDS database Dep. ID #10060233. +1 other reference |
- Peridot area [Gila County]
| MRDS database Dep. ID #10060241 |
| MRDS database Dep. ID #10095952 |
| MRDS database Dep. ID #10060231 |
| MRDS database Dep. ID #10062190 |
| MRDS database Dep. ID #10209800 |
| MRDS database Dep. ID #10210079. |
| Reber et al. (1916) +1 other reference |
| P Cristofono collection |
| Moolick et al. (1966) +1 other reference |
- Steeple Rock Mining District (Duncan Mining District)
| MRDS database Dep. ID #10060236 MRDS ID ... |
| MRDS database Dep. ID file #10161567. |
| [Opal-A var: Opal-AN] The-Vug.com Collecting Minerals of La ... |
| [Opal-A var: Opal-AN] P Cristofono collection |
- Santa Maria Mining District (Planet Mining District; Swansea Mining District; Bill Williams Mining District)
| [Opal-A var: Opal-AN] The-Vug.com Collecting Minerals of La ... |
| [Opal-A var: Opal-AN] Dana 6: 1094. |
| MRDS file #10060235. |
| Galbraith (1959) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Galbaith (1959) +1 other reference |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Granger et al. (1962) |
- Cleopatra Mining District
- Kimble Mining Sub-District
- Maggie Canyon zeolite and Mn deposit
| Mouat (1962) |
| [Opal-A var: Opal-AN] Galbraith (1959) |
- Union Pass Mining District (Katherine Mining District)
| Galbraith (1959) |
- Lost Basin Mining District
| Theodore et al. (1987) |
| Tauber (2015) |
| Sun (1961) +1 other reference |
| Gilluly (1946) +1 other reference |
- Helvetia-Rosemont Mining District
| MRDS database Dep. ID file #10060227 |
| Luetcke (n.d.) |
- Tiptop Mine group (Tiptop Camp prospects/mines)
| [Opal-A var: Opal-AN] P Cristofono collection |
- Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District)
| [Opal-A var: Opal-AN] |
| Anthony et al. (1995) |
- Silver Bell Mining District
| Kerr (1951) +2 other references |
- Tucson Mountain District Saguaro National Park
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
- Bunker Hill District (Copper Creek District)
- Copper Creek (Copper Creek Canyon)
| [Opal-A var: Opal-AN] Martin (2023) |
| MRDS database Dep. ID #10060185 |
| Wilson (1949) |
| Bollaert |
| Frank Karasti |
- Mineral Mountain Mining District
| [Opal-A var: Opal-AN] Collected by C. Lemanski |
- Riverside Mining District
| Galbraith (1959) |
- San Pedro Mining District
- San Pedro River-Alder Wash confluence area
| MRDS database Dep. ID #10186713 |
| Univ. AZ Bull. 41 (1916-17) +1 other reference |
| MRDS database Dep. ID #10060239 |
| Anthony et al. (1995) |
- Oro Blanco Mining District (Ruby Mining District)
| Anthony et al. (1995) |
| Phillips (1987) |
- Huachuca Mountains Northwestern foothills
| Peirce (1969) |
| Lewis (1942) +1 other reference |
| [Opal-A var: Opal-AN] Galbraith (1959) |
| [Opal-A var: Opal-AN] Schrader (1915) |
- Bradshaw Mountains (Bradshaw Range)
- Agua Fria Mining District
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Galbraith (1959) +2 other references |
- Castle Creek Mining District
| Galbraith (1959) |
| Luetcke (n.d.) |
| [Opal-A var: Opal-AN] Dale (1961) |
- Pine Grove Mining District
| Scovil et al. (1991) |
- Camp Verde Mining District
| MRDS database Dep. ID #10060244 |
| Galbraith (1959) |
| Hewett (1960) +1 other reference |
| Galbraith (1959) +1 other reference |
| [Opal-A var: Opal-AN] Former Don Miller collection |
| US Atomic Energy Commission Prelim. ... +2 other references |
| Outerbridge et al. (1960) +1 other reference |
| Arkansas Geological Survey |
| Howard (2007) |
| Rocks and Minerals (1988) |
| Rocks and Minerals (1988) |
| www.lgsweb.org (2002) |
- Quarry Mountain (North Mountain)
| Rocks & Min.: 21:424. |
| Rocks & Min.: 21:424. |
| www.handbookofmineralogy.org (2012) |
| Howard +1 other reference |
| Rocks and Minerals (1976) |
| Henry Barwood - unpublished (2010) |
| Arkansas Geological Survey |
| - (2005) |
| Howard (1987) +1 other reference |
| - (2005) |
| Howard (1987) +1 other reference |
| - (2005) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| Rocks & Min.:63:118. |
| Rocks and Minerals (1988) |
| Rocks and Minerals (1988) +1 other reference |
| Henry Barwood - unpublished (2010) |
| Arkansas Geological Survey |
| Rocks & Min.:63:123 +1 other reference |
| [Opal-A var: Opal-AN] Arkansas Geological Survey |
| Jay Ellis Ransom |
| Prenn et al. (1991) |
| Pabst (1940) |
- Fiddletown Mining District (Oleta Mining District)
| - (2005) |
| - (2005) |
| January +2 other references |
| - (2005) |
| - (2005) |
- Carson Hill Mining District (Melones Mining District)
- Carson Hill Gold Mining Company Mines (Carson Hill Mines)
| Dana 7:I:206 +1 other reference |
- Mokelumne Hill Mining District
- Chili Gulch (Chile Gulch ?)
| Browne (1869) +2 other references |
| Clark et al. (1963) |
| Clark et al. (1963) |
| - (2005) |
- French Creek Mining District
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
- Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District)
| - (2005) |
| Van Nostrand Reinholt Press: 351. +2 other references |
| Van Nostrand Reinholt Press: 355. +2 other references |
| Slowey et al. (2008) |
| Davis (1951) +1 other reference |
| Pisciotta (2019) |
- Salmon Falls Mining District (Flagstaff Hill area)
- Pilliken Mine (Pillikin Mine; Pillikan Mine; Pilliken Chrome Mine)
| - (2005) |
| - (2005) |
| Murdoch (1966) |
- Big Creek-Rush Creek Mining District
| Walstrom (2005) |
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| Van Nostrand Reinholt Press: 464. +2 other references |
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| Murdoch (1966) |
- Little Panoche Detention Dam
| - (2005) |
| - (2005) |
| - (2005) |
- Paymaster Mining District
| Perry |
| Murdoch (1966) |
| [Opal-A var: Opal-AN] Collection of RJ Martin |
| - (2005) |
| Van Nostrand Reinholt Press: 115. +1 other reference |
| [Opal-A var: Opal-AN] Van Nostrand Reinholt Press: 355. +1 other reference |
| - (2005) |
| Van Nostrand Reinholt Press: 355. +2 other references |
| - (2005) |
| - (2005) |
| Rogers (1922) +1 other reference |
| Pemberton (1983) |
| - (2005) |
| Van Nostrand Reinholt Press: 355. +2 other references |
| Van Nostrand Reinholt Press: 326. +2 other references |
| Stoddard (1923) +1 other reference |
- El Paso Mountains District
| Christopher N. Wentzell |
| Christopher Wentzell |
| MacFall (1951) |
| Van Nostrand Reinholt Press: 355. +4 other references |
| Van Nostrand Reinholt Press: 368-369 +4 other references |
- Mojave-Rosamond Mining District (Mojave Mining District)
| Lewis (1933) +1 other reference |
- Rademacher Mining District
| Kunz (1900) +1 other reference |
- Rand District (Randsburg District)
| - (2005) |
| Braitwaite |
| Murdoch (1966) |
| Van Nostrand Reinholt Press: 356. +2 other references |
| - (2005) |
- Great Western-Mirabel group
| - (2005) |
| [Opal-A var: Opal-AN] Dana 6: 1096. |
- Sulphur Creek Mining District (Sulfur Creek Mining District; Wilbur Springs Mining District)
| Van Nostrand Reinholt Press: 215 +7 other references |
| USBM IC8252 |
| Van Nostrand Reinholt Press: 355. +2 other references |
| Murdoch (1966) |
| California Division of Mines and Geology (1981) +1 other reference |
| Butler |
| - (2005) |
| Oakeshott (1958) |
| MarekC field collection 2014 |
| M.Chorazewicz collection |
| Sampson (1937) +1 other reference |
| Gay et al. (1954) |
| mineralsocal.org |
| Merrill (1916) +2 other references |
- Cahuenga Boulevard roadcut
| Neuerberg (1951) |
| Gay et al. (1954) |
| Van Nostrand Reinholt Press: 353-354 +2 other references |
| Cameron Holden’s collection |
| California Division of Mines and Geology (11) +1 other reference |
| California Journal of Mines and Geology (1937) +1 other reference |
| Van Nostrand Reinholt Press: 422. +2 other references |
| Van Nostrand Reinholt Press: 441. +2 other references |
| - (2005) |
| [Opal-A var: Opal-AN] Pelletier |
| Van Nostrand Reinholt Press: 355. +3 other references |
| Murdoch (1966) |
- California Aquaduct Dos Amigos Pumping Station
| - (2005) |
| - (2005) |
| Murdoch (1966) |
| calif Div Mines SR48 "Economic Geology ... |
| [Opal-A var: Opal-AN] Van Nostrand Reinholt Press: 355. +3 other references |
- Bridgeport Mining District
| Holmes (1965) +1 other reference |
| Van Nostrand Reinholt Press: 117. +2 other references |
| Van Nostrand Reinholt Press: 117. +2 other references |
| Hart (1966) |
- Parkfield Mining District
| - (2005) |
- Santa Lucia Mts (Santa Lucia Range)
| Hart (1966) +1 other reference |
| Hart (1966) +1 other reference |
| Hart (1966) |
| Hart (1966) +1 other reference |
| Hart (1966) +1 other reference |
| California Geology (1981) +1 other reference |
| Hart (1966) |
| Clark (1993) |
| - (2005) |
| - (2005) |
| USGS MRDS database (2005) |
| - (2005) |
| USGS MRDS database (2005) |
- Knoxville Mining District
| Rocks&Min 11 (8) |
| Sherlock et al. (1995) |
| Van Nostrand Reinholt Press: 273. +2 other references |
| California Geology (1981) +1 other reference |
| Weaver (1949) |
- Grass Valley Mining District
| - (2005) |
| Murdoch (1966) |
| California Preliminary Report: 15: Pls. ... |
| Murdoch (1966) |
| Rocks & Min.: 17:412. |
| [Opal-A var: Opal-AN] Van Nostrand Reinholt Press: 356. +3 other references |
| DeVito et al. (1984) |
- Mule Mountains District (Hodges Mountain District)
| |
| Erd et al. (1993) +1 other reference |
| Anderson et al. (1915) +1 other reference |
| - (2005) |
| Kunz (1903) +3 other references |
| Van Nostrand Reinholt Press: 356. +2 other references |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
- Bullion Mts (Bullion Range)
- Stedman District (Ludlow; Rochester; Buckeye)
| Robert E.Walstrom Collection |
| |
| |
- Calico Mts (Calico Hills)
| Mayo (1972) |
- East Kramer Mining District
- East Kramer Borate area (East Kramer Colemanite area)
| MarekC (2018) +1 other reference |
| |
- Lucerne Valley Limestone District
| Howard H. J. (2011) |
| - (2005) |
| Christopher N. Wentzell |
| Beste (2005) |
| - (2005) |
| Perry +1 other reference |
| Tschernich (1992) |
- Silver Lake Mining District
| [Opal-A var: Opal-AN] Eckhard D. Stuart collection |
| [Opal-A var: Opal-AN] collected by Brent Thorne |
| [Opal-A var: Opal-AN] Collected by and in the collection of ... |
- Aguanga Mountain Mining District (Smith Mountain Mining District)
| [Opal-A var: Opal-AN] Cordova |
| Jahns et al. (1951) |
| [Opal-A var: Opal-AN] Rogers |
| Schlocker (1974) |
| Murdoch (1966) |
| Laizure (1925) +2 other references |
| Laizure (1925) +1 other reference |
| Minobras (1973) +1 other reference |
| Lapidary Journal |
| Laizure (1925) +1 other reference |
| Laizure (1925) +1 other reference |
- Santa Lucia Mts (Santa Lucia Range)
| Laizure (1925) +1 other reference |
- Cambria-Oceanic Mining District
| Am Min 64:3-4 pp 1026-1038 |
| - (2005) |
| Franke (1935a) +1 other reference |
| Murdoch (1966) |
| Rogers (1911a) +2 other references |
| Eichhubl et al. (1998) |
| California Geology (1981) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| USGS MRDS database (2005) |
| Dibblee et al. (1950) +2 other references |
| Dibblee et al. (1950) +1 other reference |
| California Division of Mines and Geology (1990) +1 other reference |
| Amir Akhavan Collection |
| Huguenin (1919) +2 other references |
| Dibblee et al. (1950) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| California Division of Mines Bulletin 186 (1966) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
| Rogers (1938) +1 other reference |
| Dibblee et al. (1950) |
| Dibblee et al. (1950) +1 other reference |
- Vandenberg Space Force Base
| Dibblee et al. (1950) +1 other reference |
| Dibblee et al. (1950) +1 other reference |
- Black Wonder Mining District
| Van Nostrand Reinholt Press: 374. +2 other references |
| - (2005) |
- New Almaden Mining District
| Rocks & Minerals (1944) |
| Bradley (1918) |
| Van Nostrand Reinholt Press: 221. +3 other references |
| [… (abstract) +2 other references |
| Bradley (1940) +1 other reference |
| California Division of Mines and Geology (1990) +1 other reference |
| California Division of Mines and Geology (1981) +1 other reference |
| Logan (1926) +2 other references |
| Averill (1939) +1 other reference |
| California Division of Mines and Geology (1963) +1 other reference |
| Averill (1939) +1 other reference |
| California Geology (1981) +1 other reference |
| - (2005) |
- East Shasta Copper - Zinc Mining District
| - (2005) |
- Lassen Volcanic National Park
| Van Nostrand Reinholt Press: 265 +3 other references |
| Robert G. Lee et al. (2005) |
| - (2005) |
| California Journal of Mines and Geology (1928) +1 other reference |
- Alleghany Mining District (Forest Mining District)
| - (2005) |
| California Division of Mines Bulletin ... |
| MacFall (1951) |
| [… (abstract) +2 other references |
- Lava Beds National Monument
| Van Nostrand Reinholt Press: 356. +2 other references |
| Murdoch (1966) |
- Guerneville Mining District
| Quicksilver resources of California: with a section on metallurgy and ore ... By Walter Wadsworth Bradley (1917) +1 other reference |
| Van Nostrand Reinholt Press: 124 +3 other references |
| Honke et al. (1950) +1 other reference |
| Bradley (1916a) +1 other reference |
| Honke et al. (1950) +1 other reference |
| Honke et al. (1950) |
- West Mayacmas Mining District
| Van Nostrand Reinholt Press: 356. +2 other references |
| Bradley (1918) |
| - (2005) |
| Honke et al. (1950) +1 other reference |
| 87-293 +6 other references |
| - (2005) |
| - (2005) |
| Van Nostrand Reinholt Press: 356. +4 other references |
| - (2005) |
| Murdoch (1966) |
| Walstrom (n.d.) |
| D. B. Sterrett (1912) |
| Matthew Stanley Collection |
- Big Oak Flat Mining District
| - (2005) |
| Van Nostrand Reinholt Press: 288. +2 other references |
| DeVito (1992) |
| Hampson (2004) |
- Boulder County Tungsten Mining District
| USGS Bull 583 |
| Lovering et al. (1950) +1 other reference |
| Ralph Van Alstine (1969) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| Yalmer Primeau collection |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| Bull. Soc. Franç. Minéralo. ... |
| Eckel et al. (1997) |
| USGS Bull 1716C |
| Eckel et al. (1997) |
| U.S. Geological Survey Professional ... +1 other reference |
| - (2005) |
| - (2005) |
- Idaho Springs Mining District (Virginia Mining District)
| Eckel et al. (1997) |
- Lamartine Mining District
| U.S. Geological Survey Professional ... |
| U.S. Geological Survey Professional ... +2 other references |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| [Opal-A var: Opal-AN] collected specimens by Alan Goldstein. |
| Eckel et al. (1997) |
| Hanley et al. (1950) +1 other reference |
- Tallahassee Creek Mining District
| USGS OFR 84-219 +1 other reference |
| USGS OFR 84-219 +1 other reference |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| Eckel et al. (1997) |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
- Vulcan Mining District (Cebolla Mining District; Domingo Mining District)
| Eckel et al. (1997) |
- White Earth Mining District (Powderhorn Mining District)
| - (2005) |
- Galena Mining District (Henson Creek Mining District)
| Eckel et al. (1997) |
- Park Mining District (Whitecross Mining District)
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Rocks & Minerals 79:4 |
| Wilson (1988) |
| The Oxidized Zinc Ores of Leadville ... |
| The Oxidized Zinc Ores of Leadville ... |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| Eckel et al. (1997) |
- McInnis Canyons National Conservation Area
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
- Douglas Mountain Mining District
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Rocks & Minerals (July-August, 2002) |
| [Opal-A var: Opal-AN] Eckel et al. (1997) |
| Desborough et al. (2010) |
| Eckel et al. (1997) |
| American Mineralogist (1982) |
| Eckel et al. (1997) |
| Lindgren et al. (1906) |
| Rob Lavinsky (ex. Rochard Kosnar specimen) |
| Eckel et al. (1997) |
| Carnein et al. (2005) |
| Eckel et al. (1997) |
| Keller et al. (2006) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi (1994) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi (1994) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) +1 other reference |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] field trip report |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] Betts (1999) |
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] Betts (1999) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] Shepard (1837) |
| Shepard (1837) |
| [Opal-A var: Opal-AN] Ed Force collection |
| [Opal-A var: Opal-AN] A. Berluti collection |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| Yedlin (1964) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
- Torrington (Wolcottville)
| Orcutt (1878) |
| [Opal-A var: Opal-AN] Mike Polletta Observation |
| [Opal-A var: Opal-AN] Personally collected by A. Berluti in ... |
| [Opal-A var: Opal-AN] Collected by A. Berluti in 2009-11 |
| [Opal-A var: Opal-AN] Jones (1960) |
| [Opal-A var: Opal-AN] Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] Schooner (1958 and 1961) +1 other reference |
| [Opal-A var: Opal-AN] Schooner (1958) +1 other reference |
| [Opal-A var: Opal-AN] Jones (1960) |
| [Opal-A var: Opal-AN] Kevin Czaja Collection |
| [Opal-A var: Opal-AN] Former Don Miller collection |
| [Opal-A var: Opal-AN] Former Don Miller collection |
| [Opal-A var: Opal-AN] Kevin Czaja Collection |
| [Opal-A var: Opal-AN] Kevin Czaja Collection |
- White Rock Mining District
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] Moritz (n.d.) +1 other reference |
| [Opal-A var: Opal-AN] Jones et al. (1960) |
| Januzzi et al. (1976) |
| [Opal-A var: Opal-AN] Schooner (1955) |
| [Opal-A var: Opal-AN] Jones (1960) |
| [Opal-A var: Opal-AN] Jones (1960) |
| [Opal-A var: Opal-AN] Jones (1960) |
| [Opal-A var: Opal-AN] Rocks & Minerals (1970) |
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] Brace (1823) +1 other reference |
| [Opal-A var: Opal-AN] Ryerson (1972) |
| [Opal-A var: Opal-AN] Visually identified at a CT museum |
| Bernstein (1976) |
| Zeitner (1968) |
| - (2005) |
| - (2005) |
| U.S. Geological Survey +1 other reference |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
- Central Florida Phosphate Mining District (Bone Valley)
| Marc V. Hurst (2012) |
| |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
- Cartersville Mining District
| [Opal-A var: Opal-AN] Rocks & Min.: 64:185. |
| - (2005) |
| Cook (1978) |
| - (1917) |
| |
| [Opal-A var: Opal-AN] Rocks & Min.: 64:187. |
| [Opal-A var: Opal-AN] Cook (1978) |
| Gems and Minerals of America- Jay Ellis ... |
| [Opal-A var: Opal-AN] Rocks & Min.:64:190. |
| [Opal-A var: Opal-AN] Gems and Minerals of America- Jay Ellis ... |
- Stone Mountain-Lithonia Mining District
| [Opal-A var: Opal-AN] Cook (1978) |
| [Opal-A var: Opal-AN] Cook (1978) |
| [Opal-A var: Opal-AN] Cook (1978) |
| [Opal-A var: Opal-AN] Betts (n.d.) |
| [Opal-A var: Opal-AN] Rocks & Min.:64:195 +1 other reference |
| Gems and Minerals of America- Jay Ellis ... |
| Gems and Minerals of America- Jay Ellis ... |
| [Opal-A var: Opal-AN] Cook (1978) |
| [Opal-A var: Opal-AN] |
| Cook (1978) |
| [Opal-A var: Opal-AN] - (1917) |
| Cook (1978) |
| Cook (1978) |
| [Opal-A var: Opal-AN] Cook (1978) |
| Schlanger (1964) |
| Hon |
- Koolau Range (Koolau caldera)
| Fujishima et al. (1977) |
| Gübelin et al. (1976) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
- Idaho City Mining District
| Dake (1956) |
| - (2005) |
| Kim Strange collection |
| Extra Lapis - English No. 10 Opal |
| |
- Bay Horse Mining District
| [Opal-A var: Opal-AN] John Cornish collection |
| Ream (2004) |
| Dake (1956) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| The Mineralogist |
| C. Lemanski (re-entry lost Mindat data) |
| Tschernich et al. (1982) +1 other reference |
| Dake (1956) |
| Dake (1956) |
| The Moscow Opal Mines 1890 to 1893 (The First Commercial Opal Mines in the United States) |
| Dake (1956) |
- Blackbird Mining District
| - (2005) |
| Christopher Wentzell collection (2020) |
| WC van Laer |
| Dake (1956) |
| Extra Lapis - English No. 10 Opal |
| Dake (1956) |
| Dake (1956) |
| Beste (2005) |
| USGS Bulletin 1720b |
| Dake (1956) |
| - (2005) |
| - (2005) |
| - (2005) |
| Dake (1956) |
| - (2005) |
| - (2005) |
- Rough Mountain Mining District
| - (2005) |
| - (2005) |
- Big Creek Mining District
| - (2005) |
| - (2005) |
| - (2005) |
- Marble Creek Mining District
| - (2005) |
- Monumental Creek Mining District
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (1956) +1 other reference |
| - (2005) |
| - (2005) |
| - (2005) |
| Dake |
| Dake |
| Erd et al. (1960) |
| Erd et al. (1960) |
| Kansas Geological Survey Educational ... +1 other reference |
| Kansas Geological Survey Educational ... +1 other reference |
| Kansas Geological Survey Educational ... +1 other reference |
| Kansas Geological Survey Educational ... +1 other reference |
| Kansas Geological Survey Educational ... +1 other reference |
| Ransom |
| Anderson (1994) |
| Earth Treasures Vol 4 |
| Jay Ellis Ransom |
| R&M 69:3 pp 156-162 |
- East Mount Apatite Mining District
| [Opal-A var: Opal-AN] Bill Bunn |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] King et al. (1994) |
| |
| King (ed.) |
| [Opal-A var: Opal-AN] Thompson et al. (1998) |
| [Opal-A var: Opal-AN] ... |
| [Opal-A var: Opal-AN] Thompson et al. (1998) |
| Falster et al. (2019) |
| [Opal-A var: Opal-AN] Moritz (n.d.) |
| [Opal-A var: Opal-AN] King et al. (1994) +1 other reference |
| [Opal-A var: Opal-AN] King et al. (1994) +1 other reference |
| [Opal-A var: Opal-AN] King et al. (6) +1 other reference |
| [Opal-A var: Opal-AN] King et al. (1994) |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] Dionne et al. (2014) |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] A.Mathauser collection |
| [Opal-A var: Opal-AN] Rocks & Min.: 62:413. |
| [Opal-A var: Opal-AN] King (n.d.) |
| [Opal-A var: Opal-AN] Thompson et al. (1998) |
| Jat Thompson Collection |
| Ostrander (1940) |
| Ostrander (1940) |
| Pearre (1960) |
| Rocks & Min.:11:111 +1 other reference |
| Jat Thompson |
| Stuart Herring Collection |
| - (2005) |
| Ostrander (1940) |
| [Opal-A var: Opal-AN] Minerals of Maryland (1940) +1 other reference |
| Bernstein (1980) |
| Bernstein (1980) |
| [Opal-A var: Opal-AN] Cordua (1969) |
| [Opal-A var: Opal-AN] Gleba (2008) |
| Sears (1905) |
| Sears (1905) |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection 2011 |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P. Cristofono collection 2011 |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] Emerson (1882) +1 other reference |
| [Opal-A var: Opal-AN] Emerson (1895) |
| [Opal-A var: Opal-AN] Emerson (1895) |
| [Opal-A var: Opal-AN] Emerson (1895) |
| Gleba (2008) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P Cristofono collection 2010 |
| Gleba (2008) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] Rocks & Min.: 21:75. +1 other reference |
| |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] Gleba (2008) |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] T Mortimer collection |
| [Opal-A var: Opal-AN] P Cristofono collection |
| Jay Ellis Ransom |
| Journal of the Mississippi Academy of ... |
| - (2005) |
| - (2005) |
| Lowe (1919) |
| Sherwood et al. (1998) |
| Jay Ellis Ransom |
| Rocks & Min. |
| USGS Bulletin 340J |
| Dake |
| [Opal-A var: Opal-AN] Sherwood et al. (1998) |
| Jay Ellis Ransom |
| Anita Moore-Nall and David R. Lageson (2015) |
| - (2005) |
| Jay Ellis Ransom |
| Rob Lavinsky specimen |
- Clancy-Lump Gulch Mining District
| [Opal-A var: Opal-AN] Meschter (1953) |
| Knopf (1913) |
- Blue Cloud Mining District
| - (2005) |
- Lower Hot Springs Mining District (Norris Mining District)
| Winchell (1914) |
| University of Adelaide - Tate Museum ... |
| Chris Tucker and John Betts specimens. +1 other reference |
| |
| |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| Rocks & Minerals (1955) |
| The Minerals and Gemstones of Nebraska ... |
| R.J. Dunham (1955) |
| The Minerals and Gemstones of Nebraska ... |
| Zeitner (1956) |
| The Minerals and Gemstones of Nebraska ... |
| Jay Ellis Ransom |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| |
| The Minerals and Gemstones of Nebraska ... |
| The Minerals and Gemstones of Nebraska ... |
| MacFall (1975) |
| Jay Ellis Ransom |
| Jay Ellis Ransom |
| Jay Ellis Ransom |
| Gübelin et al. (1976) |
| Castor et al. (2004) |
- Dixie Valley Mining District
| Econ Geol (1994) |
| LUTZ et al. (May 7–9, 2002) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| A workshop with special emphasis on the Anatolian deposits International Earth Science Colloquium on the Aegean Region (IESCA-2012, İzmir, Turkey) +1 other reference |
- Wild Horse Mining District
| Castor et al. (2004) |
- Gold Butte Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| - (2005) |
- Coal Mine Mining District
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) +2 other references |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| Castor et al. (2004) |
| Castor et al. (2004) |
- Gold Circle Mining District (Midas Mining District)
| LaPointe et al. (199) |
- Huntington Creek Mining District
| LaPointe et al. (199) |
| USGS Open-File Report 76-56 +2 other references |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| - (2005) |
| LaPointe et al. (199) |
| Cain et al. (2007) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| - (2005) |
| Am Min 64:3-4 pp 1026-1038 +2 other references |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| [Opal-A var: Opal-AN] LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| USGS Open-File Report 76-56 |
- Mud Springs Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
| USGS Bull 1162B |
- Rock Creek Mining District
| LaPointe et al. (199) |
| LaPointe et al. (199) |
| LaPointe et al. (199) |
- Ruby Valley Mining District
| Castor et al. (2004) |
- Scraper Springs Mining District
| LaPointe et al. (199) |
| - (2005) |
| Castor et al. (2004) +1 other reference |
| - (2005) |
- Fish Lake Valley Mining District
| Am Min 64:3-4 pp 1026-1038 +2 other references |
| NBMG Bull 78 Geology and Mineral ... |
| NBMG Bull 78 Geology and Mineral ... |
| NBMG Bull 78 Geology and Mineral ... +1 other reference |
| - (2005) |
| NBMG Bull 78 Geology and Mineral ... |
| NBMG Bull 78 Geology and Mineral ... |
| NBMG Bull 78 Geology and Mineral ... |
| - (2005) |
| Castor et al. (2004) |
- Montezuma Mining District
| NBMG Bull 78 Geology and Mineral ... |
- Red Mountain Mining District
| NBMG Bull 78 Geology and Mineral ... |
| [Opal-A var: Opal-AN] American Mineralogist 19:268-274 |
| Castor et al. (2004) |
| - (2005) |
| NBMG Bull 78 Geology and Mineral ... |
| NBMG Bull 78 Geology and Mineral ... |
| USGS Bull 1998 +1 other reference |
- Maggie Creek Mining Subdistrict
| Jensen et al. (1995) |
| Castor et al. (2004) |
| [Opal-A var: Opal-AN] Castor et al. (2004) |
| - (2005) |
- Awakening Mining District
| USGS Bull 2090 +4 other references |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor +1 other reference |
| - (2005) |
| - (2005) |
| Econ Geol (1985) |
| - (2005) |
| - (2005) |
| NBMG Bull 59 Geology and Mineral ... |
| Williams (1979) |
- Rabbit Hole Mining District
| Adams |
| Adams |
| Castor et al. (2004) |
| - (2005) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Castor et al. (2004) |
| NBMG files No. 50600003 +2 other references |
| USGS Bull 1538D |
| USGS Bull 1538D +1 other reference |
| Christopher Wentzell +1 other reference |
| Eckert (1997) |
| USGS Bull 1538D +1 other reference |
| Christopher Wentzell collection. |
| USGS Bull 1538D |
| Christopher Wentzell |
| Castor et al. (2004) |
| Extra Lapis - English No. 10 Opal +1 other reference |
| USGS Bull 1538D +1 other reference |
| USGS Bull 1538D +1 other reference |
| Keith Hodson (1994) |
| USGS Bull 1538D +1 other reference |
| Castor et al. (2004) |
| Christopher Wentzell |
| Castor et al. (2004) |
- WRT Stonetree group ("Dominion Opal Mine")
| Christopher Wentzell collection. |
| Sinkankas (1959) |
| Christopher Wentzell +1 other reference |
| Christopher N. Wentzell |
| various contributors (2013) |
- Virgin Valley Mining District
| - (2005) |
| - (2005) |
- Battle Mountain Mining District
| USGS Bull 2009 |
- Birch Creek Mining District
| Nevada Bureau of Mines and Geology ... +1 other reference |
| Page et al. (1956) +2 other references |
| Fries |
| NBMG Bull 80 Geology and Mineral ... |
| NBMG Bull 80 Geology and Mineral ... +1 other reference |
| NBMG Bull 80 Geology and Mineral ... |
| - (2005) |
| - (2005) |
- Reese River Mining District
| Jensen (2012) |
| - (2005) |
- Spencer Hot Springs Mining District
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| NBMG Bull 73 Geology and Mineral ... +1 other reference |
- Mormon Mountains District
| Castor et al. (2004) |
| Page et al. (1956) +2 other references |
| - (2005) |
| USGS Minerals Yearbook - Diatomite 1998 |
| Castor et al. (2004) |
| - (2005) |
- Yerington Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
- Talapoosa Mining District
| - (2005) |
| King (n.d.) |
| NBMG Bull 58 Geology and Mineral ... +1 other reference |
| NBMG Bull 58 Geology and Mineral ... |
- Red Ridge Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
- Barcelona Mining District (Spanish Belt Mining District)
| - (2005) |
| Rob Lavinsky specimen |
| NBMG Bull 77 Geology and Mineral ... |
| Palache et al. (1951) |
| - (2005) |
| USGS Bull 620D |
| Castor et al. (2004) |
| USGS Bull 620D |
| USGS Bull 620D |
| NBMG Bull 77 Geology and Mineral ... +1 other reference |
| NBMG Bull 77 Geology and Mineral ... |
| - (2005) |
| Castor et al. (2004) |
| Castor et al. (2004) |
- Paradise Peak Mining District
| Econ Geol (1994) |
| Page et al. (1956) +2 other references |
| [Opal-A var: Opal-AN] Castor et al. (2004) |
| - (2005) |
| [Opal-A var: Opal-AN] Castor et al. (2004) |
| Castor et al. (2004) |
- Manhattan Mining District
| Castor et al. (2004) |
| Castor et al. (2004) |
- Northumberland Mining District
| MinRec 16 (1) |
| Nevada Bureau of Mines and Geology NBMG ... +1 other reference |
| USGS Minerals Yearbook - Diatomite 1998 |
- Antelope Springs Mining District
| [Opal-A var: Opal-AN] Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| - (2005) |
| - (2005) |
| Castor et al. (2004) |
- Nightingale Mining District
| [Opal-A var: Opal-AN] Larry J (1973) |
- Seven Troughs Mining District
| Walstrom (n.d.) |
- Table Mountain Mining District
| - (2005) |
| - (2005) |
| Part 1 +1 other reference |
- Castle Peak Mining District
| NBMG Bull 70 Geology and Mineral ... |
| Castor et al. (2004) |
| Castor et al. (2004) |
| Castor et al. (2004) |
| - (2005) |
| Castor et al. (2004) |
| NBMG Bull 70 Geology and Mineral ... |
| NBMG Bull 70 Geology and Mineral ... +3 other references |
- San Emidio Mining District
| NBMG Bull 70 Geology and Mineral ... +1 other reference |
| - (2005) |
| MinRec 16 (1) |
| Castor et al. (2004) |
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| NBMG Bull 70 Geology and Mineral ... |
| - (2005) |
| Castor et al. (2004) |
| Castor et al. (2004) |
- White Pine Mining District
| - (2005) |
| - (2005) |
| - (2005) |
| [Opal-A var: Opal-AN] Rocks & Min. 80:243 |
| [Opal-A var: Opal-AN] |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] Smith |
| [Opal-A var: Opal-AN] |
| P. Cristofono collection (ex. Gene Bearss) |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| King (n.d.) |
| King (n.d.) |
| [Opal-A var: Opal-AN] P. Cristofono et al. (2011) |
| Rocks & Minerals Vol.65 No.4 +1 other reference |
| [Opal-A var: Opal-AN] Whitmore et al. (2004) |
| Thompson et al. (2022) |
| [Opal-A var: Opal-AN] P. Cristofono collection 2011 |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] P Cristofono collection +1 other reference |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection 2011 |
| [Opal-A var: Opal-AN] P Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] P. Cristofono collection 2011 |
| [Opal-A var: Opal-AN] P. Cristofono collection |
| [Opal-A var: Opal-AN] Rocks & Min.:64:504. +1 other reference |
| [Opal-A var: Opal-AN] Jeremy Zolan Collection |
| P. Cristofono collection |
| Mins. of NYC & Its Environs (1931) +1 other reference |
| [Opal-A var: Opal-AN] Manchester (1931) |
| [Opal-A var: Opal-AN] Canfield (1889) +1 other reference |
| [Opal-A var: Opal-AN] Mins. of NYC & Its Environs et al. (1931) |
| [Opal-A var: Opal-AN] Manchester (1931) |
| The Minerals of NYC & Its Environs et al. (1931) |
| Canfield FA (1898) +1 other reference |
| [Opal-A var: Opal-AN] NJ State Geol. Ann. Rpt. (1856) |
| NJ State Geol. Ann. Rpt (1856) +1 other reference |
| Mins. of NYC & Environs (1931) |
| [Opal-A var: Opal-AN] American Muiseum of Nat. History et al. (s) +2 other references |
| Kent et al. (2000) |
| Speiser (1978) |
| [Opal-A var: Opal-AN] collected by David Bernstein- 10/2009 |
| King |
| Kuitems et al. (2009) |
| Manchester (1931) |
| Yale Peabody Museum 3979 |
| Manchester (1931) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| NMGS 37th Field Conference |
| NMGS 37th Field Conference |
| NMGS 37th Field Conference |
| NMBMMR Memoir 15 Geology and Technology ... +2 other references |
- Point of Rocks Mesa (Pecks Mesa)
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| NMBMMR Bull 83 Mineral Deposits of ... |
- Cap Rock Mountain Mining District
| NMBMMR Bull 83 Mineral Deposits of ... +1 other reference |
| Northrop et al. (1996) |
| Northrop et al. (1996) +1 other reference |
| Walstrom (n.d.) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
- Pinos Altos Mining District
| [Opal-A var: Opal-AN] Identified on specimens obtained at ... |
| Northrop et al. (1996) |
- White Signal Mining District
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| NMBMMR Bull 83 Mineral Deposits of ... |
| [Opal-A var: Opal-AN] Page et al. (1956) +3 other references |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
- San Simon Mining District
| Lindgren et al. (1910) |
| Walstrom (n.d.) |
| - (2005) |
- Lordsburg Mining District
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| Luetcke (n.d.) |
- Little Florida Mountains Mining District
| www.emnrd.state.nm.us (1997) |
- Tres Hermanas Mining District
| [Opal-A var: Opal-AN] Jerry Cone Collection |
| Jerry Cone Collection +1 other reference |
| Jerry Cone Collection |
| Northrop et al. (1996) |
| Laszlo Horvath collection |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| NMBMMR Bull 81 Summary of the Mineral ... |
| Northrop et al. (1996) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| Northrop et al. (1996) |
| NMBMMR Bull 81 Summary of the Mineral ... |
| - (2005) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| NMBMMR New Mexico Mineral symposium (2004) |
- Caballo Mountains Mining District
| Jerry Cone Collection |
- Hillsboro Mining District
| [Opal-A var: Opal-AN] Luetcke (n.d.) |
| Jerry Cone Collection |
| USGS Bull 945C +1 other reference |
| [Opal-A var: Opal-AN] Gibbs (2013) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| - (2005) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| - (2005) |
| Northrop et al. (1996) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| NMBMMR OFR 19 |
| Northrop et al. (1996) |
| [Opal-A var: Opal-AN] Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| The Mineralogist |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
| Jerry Cone Collection |
- Socorro Peak Mining District
| Northrop et al. (1996) |
| Ramon DeMark and Jessie Kline |
| NMBMMR New Mexico Mineral symposium (2000) |
| Northrop et al. (1996) |
| [Opal-A var: Opal-AN] Manchester (1931) |
| [Opal-A var: Opal-AN] Rocks & Min.: 20:61. |
| [Opal-A var: Opal-AN] Jensen (1978) |
| John H. Betts (2009) |
- Manhattan (New York County)
| [Opal-A var: Opal-AN] Alfredo Petrov |
| Glenn Rhein |
| [Opal-A var: Opal-AN] King (n.d.) |
| [Opal-A var: Opal-AN] Rocks & Min.:8:61-65. |
| [Opal-A var: Opal-AN] Manchester (1931) |
| [Opal-A var: Opal-AN] Januzzi |
| - (Januzzi, 1966, 1989) +1 other reference |
| Rocks & Minerals 85:250-259 |
| [Opal-A var: Opal-AN] Manchester (1931) |
| [Opal-A var: Opal-AN] Rocks & Min.:11:66 +1 other reference |
| [Opal-A var: Opal-AN] Manchester (1931) |
| Rocks & Min.:8:39. |
| [Opal-A var: Opal-AN] Rocks & Min.: 7:91 +1 other reference |
| [Opal-A var: Opal-AN] Rocks & Min.: 6:101 & 9:136-137. |
| [Opal-A var: Opal-AN] Rocks & Min.: 8:40. |
| [Opal-A var: Opal-AN] Rocks & Min.:7:148 & 8:40. |
| [Opal-A var: Opal-AN] Manchester (1931) |
| [Opal-A var: Opal-AN] USGS Bulletion No.74 +1 other reference |
| Carpenter III (1976) |
| [Opal-A var: Opal-AN] Pratt (1933) |
| Luke Osborne states that he collected ... |
| [Opal-A var: Opal-AN] Pratt (1933) |
| Collections of Kenny Gay and Steve Adams |
| Gems and Minerals of America- Jay Ellis ... |
| [Opal-A var: Opal-AN] Ref.: Dana 6:499 |
| [Opal-A var: Opal-AN] Rocks & Min.: 17:62 |
| [Opal-A var: Opal-AN] Rocks & Min.:11:76-77. |
| [Opal-A var: Opal-AN] Veal (2004) |
| [Opal-A var: Opal-AN] Smithsonian Institution Mineral ... |
| [Opal-A var: Opal-AN] Rocks & Min.:11:58. |
| [Opal-A var: Opal-AN] Genth |
| [Opal-A var: Opal-AN] - (2005) |
| [Opal-A var: Opal-AN] - (2005) |
| [Opal-A var: Opal-AN] Rocks & Min.: 11:58. |
| [Opal-A var: Opal-AN] Genth (1891) |
| [Opal-A var: Opal-AN] Rocks & Min.:11:58. |
| [Opal-A var: Opal-AN] Rocks & Min.: 11:57. |
| [Opal-A var: Opal-AN] Streeter (2003) |
| [Opal-A var: Opal-AN] Rocks & Min.:11:77 & 60:92. |
| [Opal-A var: Opal-AN] U.S Bureau of Mines (Mas/Mils) |
| [Opal-A var: Opal-AN] Min Rec 10:1 pp29-30 |
| [Opal-A var: Opal-AN] Streeter (2003) |
| [Opal-A var: Opal-AN] Min Rec 10:1 pp29-30 |
| [Opal-A var: Opal-AN] Ross (1937) |
| [Opal-A var: Opal-AN] Rocks & Min.: 60:92. |
| [Opal-A var: Opal-AN] Min Rec 10:1 pp29-30 |
| [Opal-A var: Opal-AN] Genth |
- Bryson City Feldspar Mining District
| - (2005) |
| [Opal-A var: Opal-AN] |
- Hamme Tungsten Mining District
| [Opal-A var: Opal-AN] Ransom |
| [Opal-A var: Opal-AN] C.W. Allen collection |
| [Opal-A var: Opal-AN] C.W. Allen collection |
| [Opal-A var: Opal-AN] Rocks and Minerals (1985) +1 other reference |
| [Opal-A var: Opal-AN] Rocks & Min.:11:58. |
| Carlson (2015) |
| John Krygier specimens |
| [Opal-A var: Opal-AN] R&M 72:4 pp 252-264 |
| Rocks & Min. vol.72 (1997) |
| Dake |
- Conner Creek Mining District
| - (2005) |
| MacFall (1951) |
| Tschernich (1992) |
| Micro Probe Volume VI Number 4 |
- Clackamas River localities
| Bill Thompkins |
| - (2005) |
| - (2005) |
| Micro Probe Vol. 6 No. 5 Fall 1987 +1 other reference |
- Howard Mining District (Ochoco Mining District; Bolivar Mining District)
| - (2005) |
| - (2005) |
| - (2005) |
| |
- Newberry National Volcanic Monument
| Mineralogy of 10 Geothermal boreholes ... |
| - (2005) |
| - (2005) |
- Pueblo Mining District (Denio Mining District)
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| - (2005) |
| Marshall W. Gannett and Keith E. Bargar +1 other reference |
| - (2005) |
| - (2005) |
- Butte Creek Mining District
| Oregon Metal Mines Handbook |
- Evans Creek Mining District
| - (2005) |
| - (2005) |
| [Opal-A var: Opal-AN] K. Volkman personal collection |
| Occurs inside the Thunder Eggs |
| Aidan Cerenzie Collection |
| - (2005) |
| [Opal-A var: Opal-AN] Kleck. W. D. (1970) |
| MRDS file #10225715. |
| 174. +1 other reference |
| 173. +1 other reference |
| Dake (1956) |
| Steve Ewens Collection |
| Extra Lapis - English No. 10 Opal |
| R. E. Cohenour (1960) |
| - (2005) |
| [Opal-A var: Opal-AN] March. +1 other reference |
| [Opal-A var: Opal-AN] March. +1 other reference |
| - (2005) |
| - (2005) |
- Black Butte Mining District
| From the labelled Byron Weissberg PhD ... |
| - (2005) |
| |
- Opalite Mining District (McDermitt Mining District)
| Nevada Bureau of Mines and Geology NBMG ... +1 other reference |
| - (2005) |
| - (2005) |
| Dake (1956) |
- Santiam Mining District (Elkhorn Mining District)
| - (2005) |
| [Opal-A var: Opal-AN] USGS |
| Rocks & Minerals 81:229-234 |
| [Opal-A var: Opal-AN] The Mineralogy of Pennsylvania 1966-1975 +2 other references |
| Rocks & Min.: 59:109-120 & 62:176-178. |
| Smith and Hoff (1984) |
| [Opal-A var: Opal-AN] Mineralogy of Pennsylvania-1922 +1 other reference |
| [Opal-A var: Opal-AN] Mineralogy of Pennsylvania-1922 +1 other reference |
| [Opal-A var: Opal-AN] Mineralogy of Pennsylvania |
| [Opal-A var: Opal-AN] Gordon |
| Gems and Minerals of America- Jay Ellis ... |
| |
| [Opal-A var: Opal-AN] Miller |
| Museum of Natural History |
| Miller (1971) |
| [Opal-A var: Opal-AN] Gems & Minerals 395 (August, 1970) |
| Miller (1972) |
| [Opal-A var: Opal-AN] Eckert (1997) |
| |
| [Opal-A var: Opal-AN] George (1972) |
| Rocks & Minerals (1986) |
| Speer et al. (1987) |
| Speer et al. (1987) |
| Speer et al. (1987) |
| Jay Ellis Ransom |
| Jay Ellis Ransom |
| [Opal-A var: Opal-AN] Rocks & Minerals: 60: 117. |
| Smith et al. (2000) |
- Bald Mountain Mining District (Portland Mining District)
| Smith et al. (2000) |
| PEDRAZA ROJAS et al. (2016) |
| - (2005) |
| Smith et al. (2000) |
| Rocks & Minerals: 67 (6) +1 other reference |
| Černý et al. (1985) |
| Smith et al. (2000) |
| Roberts et al. (1965) |
| Jay Ellis Ransom |
| Jay Ellis Ransom |
| - (2005) |
| Travis A. Paris (2011) |
| U.S. Geological Survey +1 other reference |
| www.austingemandmineral.org |
| ... +1 other reference |
| Smith (1991) |
| Smith (1991) |
| Dorothy M. Schlegal (1957) |
| [Opal-A var: Opal-AN] Personally collected by Franklin Roberts |
| - (2005) |
| R. Maxwell (1962) +1 other reference |
| Smith (1991) |
| USGS National Geochemical Database ... |
| Smith (1991) |
| Smith (1991) |
| Am Min 72:1122-1130 |
| Smith (1991) |
| ... +1 other reference |
- Ray Point Mining District
| Econ Geol (1986) |
| Smith (1991) |
| Smith (1991) |
- Kingsland Granite Company Quarry (Petrick Quarry)
| [Opal-A var: Opal-AN] Self-collected by Franklin Roberts. |
| [Opal-A var: Opal-AN] Economic Geology +4 other references |
| Smith (1991) |
| [Opal-A var: Opal-AN] Roselle M. Girard (1964) |
| Smith (1991) |
| Onac et al. (2001) |
| Am Min 50:752 |
| [Opal-A var: Opal-AN] Bullock (1981) |
| Bullock (1981) |
| Bullock (1981) |
| [Opal-A var: Opal-AN] Rick Dalrymple |
- Roosevelt Hot Springs Mining District
| Petersen (1975) |
| Nielson +4 other references |
| Nassau K. (1968) |
- San Francisco Mining District
| Bullock (1981) |
| Bullock (1981) |
- Crater Island Mining District
| - (2005) |
| - (2005) |
| - (2005) |
| [Opal-A var: Opal-AN] Bullock (1981) +1 other reference |
| [Opal-A var: Opal-AN] Bullock (1981) |
| Bullock (1981) |
| [Opal-A var: Opal-AN] Palache et al. (1951) +1 other reference |
| - (2005) |
| - (2005) |
| Bullock (1981) |
- Gold Springs Mining District (Hamlin Valley)
| Bullock (1981) |
| Bullock (1981) |
| T. Kennedy collection |
| Bullock (1981) |
| J. Holfert et al. (1996) |
| Rockpick Legend |
| Luetcke (n.d.) |
| Thurston +3 other references |
| Rick Dalrymple Collection |
| [Opal-A var: Opal-AN] Bullock (1981) |
| Am.Min.: 45: 39-52 +1 other reference |
| [Opal-A var: Opal-AN] Greg Slak specimen |
| - (2005) |
- Henry Mining District (Durkee Mining District)
| - (2005) |
- Marysvale Mining District
| [Opal-A var: Opal-AN] Bullock (1981) |
| Bullock (1981) |
| North (2010) |
| Bullock (1981) |
| Bullock (1981) |
- White Canyon Mining District
| USGS: Geological Survey Circular 217 |
| [Opal-A var: Opal-AN] |
| Bullock (1981) |
| - (2005) |
| - (2005) |
- Gold Hill Mining District (Clifton Mining District)
| Bullock (1981) +1 other reference |
| - (2005) |
| Bullock (1981) +1 other reference |
| Bullock (1981) |
| - (2005) |
| - (2005) |
| - (2005) |
| Bullock (1981) +1 other reference |
| - (2005) |
| - (2005) |
| Tripp (1980) +1 other reference |
| King (n.d.) |
| Morrill & Chaffee |
| Dietrich (1990) |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Mike Dennis specimens |
| Rocks & Minerals 84:352-362. |
| Rocks & Min.:60:165. |
| Michael Hatskel Collection |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Gems and Minerals of America-Jay Ellis ... |
| Dietrich (1990) |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| Kearns +1 other reference |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| Holland (2006) |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| [Opal-A var: Opal-AN] Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| Tschernich (1992) |
| Bill Tompkins collection +1 other reference |
| Tschernich et al. (1982) +1 other reference |
| [Opal-A var: Opal-AN] T Douglas Schonewald Collection |
| T Douglas Schonewald Collection |
| [Opal-A var: Opal-AN] Personally collected by T Douglas ... |
| |
| Cannon (1975) |
| Menicucci (2010) |
| [Opal-A var: Opal-AN] T Douglas Schonewald Collection |
| [Opal-A var: Opal-AN] T Douglas Schonewald Collection |
- Snoqualmie Mining District
| Karl Volkman Personal Collection |
| John Lindell Collection |
| www.mineralcouncil.org (n.d.) |
| Cannon (1975) |
| Cannon (1975) |
| Cannon (1975) |
| Cannon (1975) |
| Cannon (1975) |
| [Opal-A var: Opal-AN] Dake (1956) |
| Rye et al. (2003) |
| John Lindell field collected specimens |
| American Mineralogist 28:257-271 +1 other reference |
| [Opal-A var: Opal-AN] www.mindat.org (n.d.) |
| Rocks & Min.:8:30. |
| Jared Goguen |
| Micro Probe Volume VII Number 9 Spring ... |
| Cannon (1975) |
| Cannon (1975) |
| [Opal-A var: Opal-AN] T Douglas Schonewald Collection |
| West Virginia Geological & Economic ... |
- Iron Ridge Mining District (Neda Iron Mining District)
| Hawley (1934) |
| Hawley (1934) |
| Hawley (1934) |
| [Opal-A var: Opal-AN] Sirbescu et al. (2008) |
| [Opal-A var: Opal-AN] Falster (1981) +1 other reference |
| Falster (1987) |
| Jay Ellis Ransom |
| Personal Collection of Matthew Neuzil |
| Van Rythoven et al. (2020) |
| Am Min 51:1567-1578 |
| - (2005) |
| Wyoming Agates. Jade State News Volume ... |
| Yale Peabody Museum |
- Grand Canyon of the Yellowstone
| 2009 Portland GSA Annual Meeting (18-21 October 2009) +1 other reference |
| [Opal-A var: Opal-AN] Iddings et al. (1892) |
| Economic Geology +4 other references |
|
Uzbekistan | |
| Uklonskiy et al. (1964) +1 other reference |
| Pechenkin et al. (2005) |
- Lyavlyakan-Beshkak ore field
| Solodov et al. (2001) |
| Franz J Dahlkamp (2009) |
| Golovanov (UzSSR) |
|
Vanuatu | |
| [Opal-A var: Opal-AN] R. Martin personal collection |
|
Venezuela | |
| Urbani (1996) |
- Auyán-tepui (Auyán-tepuy; Ayan Tepui)
| Sauro et al. (2013) |
| Sauro et al. (2013) |
| BOLETÍN INFORMATIVO DE LA COMISIÓN DE GEOESPELEOLOGÍA (Federación Espeleológica de América Latina y el Caribe -FEALC-) |
- Chimantá Massif (Chimantha Massif)
| Galli et al. (2013) |
| Franco Urbani (2017) |
| Charlie Smith Collection |
| Urbani (1996) |
| Franco Urbani (2009) |
|
Vietnam | |
| Mario Lazzerini Denchi Collection. |
| "Mario Lazzerini Denchi" Collection |
|
Zimbabwe | |
| Wolfgang Hampel |
|
Mars | |
- Aeolis Mons (Mount Sharp)
| Milliken et al. (2016) |
| Morris et al. (2016) |
| Bishop et al. (2008) +2 other references |
| Horgan et al. (2020) |
| Sun et al. (2016) |
| Bishop et al. (2009) |
| Sun et al. (2016) |
Valeč Hyalite occurrences, Valeč, Karlovy Vary District, Karlovy Vary Region, Czech Republic