 | | Journal (article/letter/editorial) | | pp. 627-651 Origin of Topaz DepositsNear Ouro Preto, Minas Gerais, Brazil DoNAn) R. Oâ˘.SEN Abstract...Abstract Topazdeposition near Ouro Preto,Minas Gerais,Brazil, tookplacein the Sabar/⢠formation,a Precambrian...Precambrian phylliteof considerable compositional range. Topaz and othermineralsweredeposited in andadjacentto...theformation deforms by flowage, andlittleor no topaz was deposited. Topaz,specularite, and euclasewere deposited...wasproduced concurrently with andslightlyafter the topaz. Quartz andmuscovite, whicharealwayspresent in thetopaz-bearing |  | | Journal (article/letter/editorial) | | from Brazil in 1785. Dana (1892) gives the locality as the mining district of Villa Rica in Minas Gerais...where it occurs with topaz. Vila Rica (ârich villageâ) was the early name for Ouro Preto (âblack goldâ), ... Figure 2. Euclase, 2.4 cm tall, Ouro Preto, Brazil. Luiz Menezes specimen, Jeff Scovil photo. 544ââ...which was the capital of Minas Gerais from 1720 to 1897. Today, Ouro Preto is a city of 70,000 residents...including AntĂ´nio Pereira, Miguel Burnier, and Rodrigo Silva. These and Boa Vista and Dom Bosco are familiar |  | | Journal (issue) | | Jewelry 1. Mark Ebert The Cap50 Topaz Deposit, Ouro Preto, Minas Gerais, Brazil 12 Peter C. Keller 21 Harry...Spring 1983 11 THE CAPAO TOPAZ DEPOSIT, OUR0 PRETO, MINAS GERAIS, BRAZIL By Peter C. Keller For over...ltnown source of imperial topaz has been a small mining district near O u r o Preto. O n e o f the oldest...the O u r o Preto district as well as the geology o f the area and occurrence o f t h e topaz. Special attention...prized color variety o f topaz. 0 ABOUT THE AUTHOR LOCATION AND ACCESS Ouro Preto is located about 285 |  | Taran, M. N., Tarashchan, A. N., Rager, H., Schott, St., Schďż˝rmann, K., Iwanuch, W. (2003) Optical spectroscopy study of variously colored gem-quality topazes from Ouro Preto, Minas Gerais, Brazil. Physics and Chemistry of Minerals, 30 (9) 546-555 doi:10.1007/s00269-003-0356-9 | Journal (article/letter/editorial) | | variously colored gem-quality topazes from Ouro Preto, Minas Gerais, Brazil Received: 19 February 2003 / Accepted:...Variously colored gem-quality topazes from Ouro Preto, Minas Gerais, Brazil, were studied by optical absorption...748, Bloco 8-T, CEP: 05508â900, SaĚo PauloâSP- Brazil e-mail: wold@uol.com.br most probably, diďŹer by...original orange color turning to a pale rose. Keywords Topaz Ă Chromium Ă Optical absorption spectra Ă Luminescence...Luminescence Ă Radiation centers Introduction Topaz, Al2(F,OH)2SiO4, is a typical mineral whose color is |  | | Book | | participation in research - My collaborators, Maria AmĂŠlia Silva Pinto, Marina J.G. Reis and Daniel A. Sauer for...1982 Jules Roger Sauer â Foreword For years Brazil has been the major producer of colored stones in...metamorphic rocks, the variety of gem deposits in Brazil is almost infinite. In addition to the mineral...assemblage one might expect from pegmatite dikes, Brazil also produces a very significant output of diamonds...written in English, and beautifully illustrated. âBrazil, Paradise of Gemstonesâ, by Jules Roger Sauer, |  | | Journal (issue) | | Moore Recent discoveries of hydroxylherderite in Minas Gerais ..............................................P. Richards Famous mineral localities: the Ouro Preto topaz mines ......................................new species of minerals, F-OH substitutions in topaz, amphiboles and tourmaline. X-rays were required...Ilha do Fundao 21.910 Rio de Janeiro, Brazil INTRODUCTION Brazil is world famous for its several occurrences...prized by collectors. These occurrences, all in Minas Gerais, are described below along with the specimens |  | | Book | | BARTORELLI ::⢠. . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA Š...Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais. Collection of Alvaro Lucio. Photograph taken...Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo, Andrea...3. Minerals - Brazil 4. Minerals- Classification 5. Mineralogy 6. Mineralogy - Brazil - History 7. Precious...Precious stones - Brazil I. Bartorelli, Andrea. II. Title. 09-10025 Cover photograph: Crystal of brazilianite |  | | Book | | A. Jobbins Butterworth-Heinemann Gem Books Topaz m(JTTERWORTH EINEMANN Butterworth-Heinemann Ltd...Library Cataloguing in Publication Data Hoover, D. B. Topaz. - (Butterworth-Heinemann Gem Books Series) I. Title...Profile xii 1 Topaz - Historical perspectives 1 Introduction 1 Etymology of topaz 1 Topaz in ancient times...times 3 Topaz in Roman times 8 The Dark Ages 12 The Middle Age~ - topaz changes colour The beginning of...of empiricism 15 13 2 Large and important topaz gems and crystals 20 Introduction 20 Giant uncut crystals |  | | Report (issue) | | Cachoeira do Campo Dom Bosco, and Ouro Branco Quadrangles Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation...Cachoeira do Campo Dom Bosco, and Ouro Branco Quadrangles Minas Gerais, Brazil By ROBERT F. JOHNSON GEOLOGY...GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-B...the Departamento National da Producao Mineral of Brazil under the auspices of the International Cooperation |  | | Journal (issue) | | ARTICLES An Update on Imperial Topaz from the Capio Mine, Minas Gerais, Brazil Daniel A. Sauer, Alice S. Keller...ABOUT THE COVER: The historic Ouro Preto region of Minas Gerais, Brazil, is world-renown for the fine...this issue. Marketed as "Imperial" topaz in the trade, the Ouro Preto topazes come in a broad range of...some of which are illustrated here. The fancycut topaz in the necklace weighs 24.13 ct; the three loose...respectively. Courtesy of Amsterdam Sauer Company, Brazil. Photo 0Harold o)Erica Van Pelt-Photographers, |  | | Journal (issue) | | Hawthorne & W. W. Pinch Fifty-nine treasure hunts in Minas Gerais . . . . . . . . . . . . . . . . . . . . . ....albite matrix, 6.6 cm, from Conselheiro Pena, Minas Gerais, Brazil. Sandor Fuss/ Stuart Wilensky specimen;...Jeff Scovil photo. For more on the minerals of Minas Gerais see Guido Stegerâs memoirs in this issue. The...clusters of brilliant black, blocky or platy crystals (Brazil, South Africa); sharp crystals in groups with flashing...rhombohedral magnesite crystals, come from Brumado, Bahia, Brazil. Switzerlandâs best-known locality for hematite |  | | Book | | until he managed to reach the land of his dreams, Brazil. A specialist in the field of geology and mineralogy...crystals and the remarkable mineral treasures of Brazil, as well as the incredible adventures and difficulties...UNIQUE MINERALS IN WORLD MUSEUMS  GEM TREASURES OF BRAZIL Cyan Magenta Yellow Black 1 Delev Ilia Deleff...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL SOFIAâMOSCOW 2004 3 Cyan Magenta Yellow Black...MINERAL TREASURES OF BRAZIL 76 85 AN OUTLINE OF THE MINERAL RESOURCES OF BRAZIL ORIGIN OF GIANT CRYSTALS |  | | Journal (article/letter/editorial) | | sericite replaces feldspars, spodumene, beryl, topaz, and tourmalines in pegmatites. Muscovite itself...from LinĂłpolis, Divino das Laranjeiras, Minas Gerais, Brazil. The field of view is 3 cm. Van King specimen...from LinĂłpolis, Divino das Laranjeiras, Minas Gerais, Brazil. Superior specimens of âstartwinnedâ muscovite...wide, from the Xanda mine, Virgem da Lapa, Minas Gerais, Brazil. Luiz Menezes specimen, Jeff Scovil photo...albite, 8.4 cm wide, from Virgem da Lapa, Minas Gerais, Brazil. When collectors think of muscovite, examples |  | | Journal (article/letter/editorial) | | spectroscopic study of Cr3+ in Brazilian topazes from Ouro Preto Received: 19 April 2005 / Accepted: 21 September...of luminescent properties of topazes from Ouro Preto, Brazil are presented. It is established that all...centers isomorphically substituting Al3+ in the topaz structure and forming [CrO4F2]7, [CrO4OH,F]7,...mullite indicating that topaz completely transforms to mullite. Keywords Topaz Ă Chromium Ă Luminescence...chromium-bearing varieties of the silicate mineral topaz, Al2(F,OH)2SiO4, are interesting because the sixfold |  | | Journal (article/letter/editorial) | | hematite crystals occur in cavities in the well-known topaz rhyolites cropping out in the Keg, Drum, and Wah...crystals reach 2 cm across and may be associated with topaz, garnet, bixbyite, beryl, and pseudobrookite. Some...the Royal Ontario Museum measures 17 x 17 x 9 cm. Brazil continues to be the source of fine hematite specimens...stocks. Well-known localities include Rodrigo Silva, Our0 Preto, where very sharp hexagonal plates to...crystals up to almost 20 cm at Sao Juliao, Our0 Preto; Itibiara, Bahia, in roselike aggregates and as |  | | Book | | MINES AND MINERALS IN BRAZIL --= ¡¡--¡ ¡¡- ¡-¡=- MINES AND MINERALS IN BRAZIL J OSIAS LEAO (ECONOMIC...regarding water power and industry of electr¡icity in Brazil were specially prepared at the Division of Waters........ 189 SUMMARY OF THE MINERAL RESERVES OF BRAZIL..... . ... ....... . .. 199 STATISTICAL TABLES...practically untouched, the mineral reserves of Brazil have already been a source of wealth to many and...without the discovery of the precious metals in Brazil the existence of the modern economic man would |  | | Journal (issue) | | dthtir LOCALITIES 5---- I Governador V aladares (Brazil) Revisited By John Sulzbach, sulzbach-ja@comcast...by phone with Roberto Bohrer at his home in Rodrigo Silva. Roberto is a ciYil engineer, fluent in English...mining of"Imperial" topaz in the region around Rodrigo Silva. Roberto buys topaz from the various mines...Rio, or through his two jewelry shops in nearby Ouro Preto. Last year, he took me to two mines, where my...entertained the miners, but didn't uncover any topaz. We agreed to try field-collecting again tomorrow |  | | Journal (issue) | | Cover image: Imperial topaz, diamond, and gold pendant by Brazilian brand Vianna. CONTENTS 5 Foreword...News 40 Cover Feature 10 Brazilâs CapĂŁo Imperial Topaz Mining 18 Beauty and Rarity â A Quest for Vietnamese...for strong new markets such as China, India, and Brazil as well as other Asian territories. All of these...for certification processes from Mine to Market. Brazil is the perfect host for this special event, which...Brazilian Gems and Jewelry Trade Association. The Brazil Gem Fair will be an important part of the Congress |  | | Journal (issue) | | 4-64 ct. â 12-40 ct. 311 EUCLASE FROM MINAS GERAIS, BRAZIL By FRANCISCO MULLER U BASTOS, F.G.A....L a short time ago, the existence of euclase in Brazil was restricted to the well-known mineralogical...mineralogical area of O u r o Pre to in the state of Minas GĂŠrais. Today, however, the attention of m a n y Brazilians...u r o PrĂŞto, the former capital of the state of Minas GĂŠrais, is considered today a national monument...r o PrĂŞto is famous for the imperial topaz or O u r o PrĂŞto topaz. This area of O u r o PrĂŞto consists |  | | Journal (issue) | | . ⢠⢠⢠⢠⢠⢠⢠⢠⢠⢠I 5.00 Rutilated Quarts, Brazil. 3 x 2 ½ x I . Polished curved face. Plus tax â˘.... . . . . . . . . . . . 2.00 Quarts w Phantom, Brazil. Fine green phantom in xi. 3 x 2 Âź . . . . . ....Evelyn Waite ..................116 QUAR1Z CRYSTAL IN BRAZIL .....................................................................118 SEMIPRECIOUS STONES IN BRAZIL .................................................MAGNETIC PROSPECTING ...............â˘124 MICA IN BRAZIL .............................................. |  | | Report (issue) | | the Departmento National da Produ^ao Mineral of Brazil under the auspices of the Agency for International...Ferrifero, Minas Gerais, Brazil By NORMAN HERZ REGIONAL GEOLOGY OF THE QUADRILATERO FERRIFERO, MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL Prepared in cooperation with the Departmento Nacional da Produqao...Produqao Mineral of Brazil under the auspices of the Agency for International Development of the United...Ferrifero, Minas Gerais, Brazil. (Regional geology of the Quadrilatero Ferrifero, Minas Gerais, Brazil) (Geological |  | | Journal (issue) | | Source from Ethiopia Mining 38 Touring Mines in Brazil Gemology 50 Fluid Inclusions Confirm Authenticity...gem-manufacturing countries, including India, Thailand, Brazil, and China. Meanwhile new gem mineral resources...and Fair Trade certification in Rio de Janeiro, Brazil, last May. These are among the many issues facing...major gem mining, production, and trade centers. ââBrazil has become an important player in the worldwide...in the field of ethical mining and fair trade, Brazil has the opportunity to promote a global exchange |  | | Book | | orthorhombic systems show basal pinacoidal cleavage as in topaz and the pyroxene and amphibole groups. It should...Twinning in quartz is virtually universal; Dauphine, Brazil and Japan twins are the most common types and twinning...separation of atoms. Mohs' scale 10 Diamond 9 Corundum 8 Topaz 7 Quartz 6 Feldspar 5 Apatite 4 Fluorite 3 Calcite...to get rid of clay minerals which contain iron Topaz Oxalic acid to remove iron stains, HF to remove...features May show weak orange fluorescence LWUV Brazil Name From Greek word Crystal system, form and |  | | Journal (issue) | | Garnets" New Era Gems, Grass Valley, CA BRAZIL 1989 Topaz, Tourmaline and Aquamarine Traveling with...2 1 Traveling wďż˝th Otto and Margret Brazil 1 989 L Topaz, Tourmaline and Aquamarines Otto & Margret...Iguassu River, flows across westwards southern Brazil for about 820 mtles ( 1 ,320 km) from Its source...m s t h e b o u n d a ry between Argentina and Brazil. Spend.Ing the afternoon on the Brazilian side...the famous Italpu Hydro Darn between Paraguay and Brazil, we followed that with a visit to the Argentine |  | | Book | | apatite, brazilianite, tourmaline, spodumene, topaz, danburite, microlite and peta- lite. In nepheline...scheelite, garnet, mica, apatite, tourmaline and topaz. Mesothermal deposits may contain gold, galena...rocks are weathered away. These include corundum, topaz, rutile, gold, diamond and the platinum minerals...bonded minerals. be recognized LEFT Topaz (Villa Rica, Brazil) in covalently this can be shown as...aBove Muscovite (Brazil) BELOW Opal (Australia) Rutilated quartz (Minas Gerais, Brazil) there is no |
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Rodrigo Silva, Ouro Preto, Minas Gerais, Brazil