 | | Journal (issue) | | heat-treated corundum from Chimwadzulu Hill, Malawi: genetic significance of zircon clusters and diaspore-bearing...gem-quality rubies from the eluvial deposits of Chimwadzulu Hill, Malawi. Zircons and multiphase-diaspore-CO 2...inclusion assemblage may help to distinguish Chimwadzulu corundums from those from other areas, individually...intermittently from the eluvial soils of Chimwadzulu Hill, southern Malawi, since the 1960s. Previous, small-scale...3 Chimwadzulu ruby ~ 2 c o:l .0 0 Ā«'" .0 1 0 200 400 600 800 1.0 B 0.8 Chimwadzulu colourless |  | | Journal (article/letter/editorial) | | titanomagnetite, 817 Liron massif, Saint-Jean-du-Gard, Gard, zircon, 79o Montboissier, Puy-de-Dome, basalt, ultrabasic...r53 Mont Dore, Puy-de-Dome, zircon, 79o Plan de la Tour, Maures, Var, zircon, 79o Puy Beaunit, Puy-de-Dome... 918 TOPOGRAPHICAL INDEX Puy Forestier, Massif Central, France, basanite, clinopyroxene, titanomagnetite...basalt, ultrabasic xenoliths, I53 Teldes, Massif Central, France, basanite, clinopyroxene, titanomagnetite...Velay granite, La Palisse, Allier, zircon, 790 Vernegoux, Massif Central, France, basanite, clinopyroxene |  | | Corporate Document | | Republic of Malawi Ministry of Mining Final Report of the Project for Establishment of Integrated Geographic...Development Co., Ltd. dummy Frontispiece 1 Map of Malawi Former capital: Zomba Headquarters of Geological...Lake Chilwa located in the southeastern part of Malawi and Chisi Island: Chisi Island is composed of syenite...Lake Malawi Upper right: Syenite distributed in Chilwa Alkaline Province in the south of Malawi (Cretaceous.............................. 19 3. The Works in Malawi .............................................. |  | | Journal (issue) | | earlieroffindings ings (tourmaline, pargasite and zircon inclusions). In addition, some internal characteristics...occurrences of the mineral (e.g. in Australia, Malawi, Thailand, Cambodia, etc.), often producing too...cloudy patches of extremely fine particles P 3 - zircon, with or without 'winged' fracture haloes P4 -...inclusions attached to strings G4 - corroded (profiled) zircon crystals G5 - pargasitic hornblende G 6 - tourmaline... Long zircon needle exposed on surface and analysed by SEM/EDS. 40X. Fig. 18. Corroded zircon crystal |  | | Journal (article/letter/editorial) | | Pakistan, anal., opt., 53; Sri Lanka, anal., 541 ; Central Australia, anal., 589 'Alum', Valcano, Italy, anal...141 Brochantite, Kirkcudbrightshire, 893 Broken Hill, New South Wales, sillimanite, 3o3; magnesian smithsonite...L.), see HUTCnISON(R.), 153 Champagnac, Massif Central, Prance, leuciterh6nile basanites, 817 CHANG (L...L. Y.), see CHEN (T. T.), 3o7 Charhls, Massif Central, France, leucite rh6nite basanites, 8i7 Charnockite...CtlANG (L. L. Y.), High-Mg smithsonite from Broken Hill, N.S.W., 3o7 Chichibu mine, Saitama prefecture, |  | | Journal (issue) | | those in glassāthat is, well spread and with the central b a n d relatively narrow as compared with cobalt...high enough to induce a "fuzzy" appearance in the zircon-sphene-rutile manner. Lithium niobate can be produced...drastically modifying the environment of this arid region. Perhaps it has been this thrust of interest that...that near D o m Bosco and Hargreaves in the Bulho Hill, some blende and sphalerite have been found with...green crystals, that resemble the beryls from the region of Gapelinha, are also found. T h e light yellow |  | | Journal (issue) | | 1355-4565 Some effects of extreme heat treatment on zircon inclusions in corundum A. H. Rankin and W. Edwards...heattreated corundum from Chimwadzulu Hill, Malawi, is due to melting and interaction of zircon with the surrounding...Identification of these quench phases and textures in zircon pseudomorphs can provide a useful criterion for...baddeleyite, quench melt, Raman, ruby, sapphire, zircon Introduction H eat treatment is commonly used...older ones. In a recent paper it was noticed that zircon inclusions in corundum from Ā© Gemmological Association |  | | Journal (issue) | | to 1" long a n d Y in diameter. Most contain a central core of green emerald from which sprout six arms...whitish-grey material. O t h e r examples have no central core at one e n d a n d yet display it at the other...area. T h e first stage was the growth of the central prism which is hexagonal a n d slightly tapered...corners was simultaneous with the growth of the central area, since if the reverse were true the growth...By powder X-ray diffraction the material in the central core a n d the side arms has been shown to be beryl |  | | Journal (issue) | | ........................................... 34 Malawi .................................................minister of mineral resources who said he believed the region needed new areas to prospect, as there have been...of machinery miners operating at present in the Central Queensland Fields, however, the number of hand...claims, and fuel prices are still on the rise. A central Queensland sapphire miner named Elias Christianos...Cynthia Renee. Photo: Robert Weldon. T he border region of northern Paraiba and southern Rio Grande do |  | | Journal (issue) | | Leidian freshwater pearl. Zhejiang. Journal of Central South University of Technology, 29(2), 111-15 Ponahlo...account of the geology and mineralogy of the Ligurian region. Figure 1: Orientation map. Figure 2: Nephrite...Nephrite occurrence Monte Bianco Domenico Pass Libiola Hill Gallinaria Mine (Casarza Ligure) Casa di Bonelli...war years due to the strategic importance of the region for naval purposes, the area appears reasonably...nephrite jade deposit. The site appears in the central part of the picture. View looking north. form irregular |  | | Journal (article/letter/editorial) | | detailed study of the sapphire occurrence of Kinyiki Hill in SE Kenya by Parkinson Ž1947., the description...blue sapphire and magnesite, is located at Kinyiki Hill just north of Mtito Andei ŽFig. 1.. Roughly a kilometre...Another body, much less well-exposed, occurs at Twandu Hill, north of Makindu ŽFig. 1.. An association of amphibolite...Many authors consider that the complexes of Kinyiki Hill ŽType 1. and of the Taita Hills ŽType 2. should...predominance of blue-green chlorite and a whitish central powdery zone Žhydrargilite or kaolinite?.. Veins |  | | Journal (issue) | | main shareholders were Anglo-American Group, 45%; Central Holdings, the Oppenheimer family trust, 45%; and...nationās output for resale to cutting operations (Hill, 2008). The State Diamond Traderās office opened...of 2008, the market went into a severe decline (Hill, 2009). Alrosa. After it was requiredānot without...with the opening of a new mine in the Nova Era region and technological developments at established mines...acquisition of the āTsavorite Projectā from Green Hill Mining Ltd. and Figure 11. This 8.72 ct green zoisite |  | | Journal (issue) | | Triplite from Pakistan ā¢ Gem localities in Zambia and Malawi ā¢ Barite āspearsā in fluorite ā¢ Inclusions in Arizona...carats) of peridot rough from the Sapat Valley region of Pakistan was purchased in early 2004. Following...overlap any of the numerous Cr and V peaks in that region. corundum samples (NBeS-1 and NBeS-2). The dominant...but they did show several peaks in the 310ā314 nm region (figure 8) that are due to chromium (NBeS-1) and...small) cuboid opaque diamonds could extend to the central part of the crystals. The East Coast laboratory |  | | Journal (issue) | | these gems. 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John...āD-TO-Zā DIAMONDS diamonds from the Cape of Good Hope region, and āJagerā for colorless diamonds with strong...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note...that results in an additional emission in the red region between 620 and 700 nm that does not have a noticeable |  | | Journal (issue) | | 1). The recent discoveries of sapphires in the region between Ambilobe and Antsiranana, the former Diego...minerals are iron oxides and minor ilmenite, with zircon and sapphire, and these are concentrated in parts...not of commercial interest. Figure 7: Group of zircon hyacinth crystals between two groups of differently...heavy metals was done in the creeks. Corundum and zircon were found only in a few places and could not be...sediments. and they were searched for corundum and zircon, but only the heavy iron oxides were found (Figure |  | | Journal (issue) | | Madagascar), South America (Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan...The major sources for diamonds were Australia, central and southern Africa (Botswana, South Africa, Namibia...scapolite, sphene, spodumene, sugilite, turquoise, and zircon), as well as for regions important for cultured...the country rather than to the specific mine or region. For more on the specific localities, consult tables...mines have prompted active exploration in this region (Schwarz, 1999). Emerald mining also continued |  | | Journal (issue) | | Breakdown Spectrometer (LIBS), which costs only in the region of US$75,000. The unit does generate circular pits...result of the impactāa question that became the central dispute in the case (Federman, 1998b). The customer...desk-model spectroscope), as well as the broad region of absorption below 500 nm that is responsible...Besides the absorption below 500 nm, there is a region of absorption from 500 to about 620 nm, as well...this 0.28 ct faceted sample results from the broad region of absorption beginning below about 500 nm. Superimposed |  | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound | | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound |  | | Journal (issue) | | nickel (depending on the color desired) into a region that extends just below the surface of the otherwise...permitted microprobe analysis of both the near-surface region affected by the diffusion treatment process, as...were taken i n a central colorless part (spectrum a), and i n the outer blue region (spectrum b), of...highly civilized, complex societies flourished in Central America, including the Olmecs, the Mayans, and...ancient civilizations have been unearthed throughout Central America, Mexico, and even Peru; yet the actual |  | | Journal (issue) | | 2 LA-ICP-MS in Gemology The Cullinan Diamonds Zircon in Heated Sapphire Faceting Rhodonite THE QUARTERLY...from it. 134 The Effects of Heat Treatment on Zircon Inclusions In Madagascar Sapphires Wuyi Wang,...and Troy R. Douthit Documents the alteration of zircon inclusions during heat treatment of sapphires at...121 Faceting Transparent Rhodonite from Broken Hill, New South Wales, Australia Paul W. Millsteed Presents...Gemological Institute of America (GIA, in Carlsbad), Central Gem Laboratory (CGL, in Tokyo), and Tiffany & Co |  | | Journal (issue) | | cultured pearls from Japan ā¢ New ruby production from Malawi ā¢ Pink to pink-orange spinel from Tanzania ā¢ Large...is produced at low pressures, typically in the region of one-tenth of atmospheric pressure, from carbon-con-...grown on a substrate held at a temperature in the region of 800ā1000Ā°C. For many industrial applications...carried out at temperatures and pressures (in the region of GEMS & GEMOLOGY SPRING 2004 3 Figure 2...absorption could be detected in the one-phonon region of the infrared spectrum and the material was therefore |  | | Journal (issue) | | 271 Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and...Kashmir (in what is now the Indian part of the region) in 1881 after a landslide revealed the blue gems...remoteness of the deposit and military activity in the region. Myanmar. Burma (known as Myanmar since 1989) has...medium-to-dark tones that were mined from the Mogok region, in Burmaās Mandalay Division. These are sometimes...(Gravender, 1934). Mining apparently halted in the region during World War II and its aftermath. It eventually |  | | Journal (issue) | | Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar Brendan M. Laurs, Federico Pezzotta...from Kazakhstan ā¢ New emerald find from the Chivor region, Colombia ā¢ New jadeite from Guatemala ā¢ Milarite...sapphire, 8.34 ct pink tourmaline, 10.99 ct blue zircon; (row 3) 8.56 ct pink sapphire, 8.37 ct blue sapphire...Evan Caplan of Omi Gems, Los Angeles, for the blue zircon (figure 67); Jeffrey Post of the Smithsonian Institution...Institution, Washington, DC, for the red zircon (figure 68); and Steve Ulatowski of New Era Gems, Grass |  | | Journal (issue) | | Sciences, London . . . . . Geological Survey of Malawi. By R. T. Cannon, BSc, PhD, . . . MIMM,formerly... Illustrations Geological Survey of Malawi Fig. 1. Geology of Malawi: after Geological map of the Federa...DevelopĀ ment, with special reference to East and Central Africa. The guests and delegates were to be invited...from Burundi, Canada, Ethiopia, Germany, Kenya, Malawi, Sudan, Tanzania, UAR, Uganda, UK, USA, USSR and...the earth sciences. Geological surveys play a central role in the process. I conclude by wishing the |
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