 | | Journal (issue) | | the International Gemmological Conference held in Brazil in September/October 1987, the author was given...cavities on the basal pinacoid of an aquamarine from Brazil. The c-axis is perpendicular to the image. Nomarski...Madagascar, sample (d) from Sta, Terezinba de Goias, Brazil, and sample (e) from Miku, Zambia, representing...chromium-free green beryl is known (Salininha, Bahia, Brazil), and some samples of a similar type were also...Sandawana, Zimbabwe; Lake Manyara, Tanzania; Itabira, Brazil or Ural Mountains, USSR, reveal the presence of |  | | Journal (issue) | | Federal University of Ouro Preto, Minas Gerais, Brazil **University of Mainz, FRG 1. Introduction The...been the most important emerald mining region in Brazil until the discovery of the Santa Terezinha occurrence... a meta somatic tran sformation into biotite/phlogopite schist took place. The ultramafites can be observed:...They consist almost exclusively of phlogopite or biotite/phlogopite and are in direct contact with the...Mg6Si4O10t:OH)8 (serpentine) = KMg3ISi3A10iJ(F5 OH) 2 (phlogopite) + Mg3lSi401J(OH)2 + 2H 2 0 (talc) Near the contact |  | | Journal (issue) | | Pearl Testing 36 Emeralds from South America – Brazil and Colombia 48 Clinohumite – The Mountain Fire...rise of new economies such as China, India, and Brazil. The challenges have been numerous as these new...every ICA member, I would like to thank the IBGM in Brazil along with every company, individual, and government... G E M O LO G Y Emeralds from South America – Brazil and Colombia By Dr. Dietmar Schwarz, research manager...terms of size and variety of gemstone deposits, Brazil can be considered as a large gemological province |  | Franz, Gerhard, Vyshnevskyi, Oleksii, Taran, Michail, Khomenko, Vladimir, Wiedenbeck, Michael, Schiperski, Ferry, Nissen, Jörg (2020) A new emerald occurrence from Kruta Balka, Western Peri-Azovian region, Ukraine: Implications for understanding the crystal chemistry of emerald. American Mineralogist, 105 (2) 162-181 doi:10.2138/am-2020-7010 | Journal (article/letter/editorial) | | value of 2.870 apfu, Table 4 for a crystal from Brazil; Aurisicchio et al. 1988). This deficit is balanced...apfu) and Al (0.085 apfu) for the crystal from Brazil. Thus, in all emeralds except those from Ural Mts...1.990 2.913 0.029 0.011/0.047 6.000 – – 9 Auris Brazil 0.340 – – 1.800 0.158 0.039 – – – 1.997 2.870 0...accommodated at the Be site (Colombia, Austria, Brazil, Mozambique, Pakistan). Only for the crystals from...majority of Gondwanabasement-type localities from Brazil, Africa, Madagascar, Australia, and India are “ultramafic” |  | | Journal (issue) | | Minas Gerais, Brazil **University of Mainz, West Germany ***CPRM, Salvador, Bahia, Brazil 1. Introduction...is currently being mined belongs to the farm 'Fazenda Piabas' and was was occupied by garimpeiros (freelance...OOO I Km 30°S 50 0 W Bahia Bahia BA-S BA-5 Fazenda do Pombo BA-6 A~ude Açude do Sossego BA-7 Brumado...BA-10 Socoto Socotö 1. The emerald occurrences in Brazil. Fig. 1. Ceara Cearâ CE-ll Tami CE-llTauâ Minas...(Itabira) MG-2 Santana dos Ferros Goias Goids GO-3 Fazenda das Lajes (Itaberai) (Itaberaï) GO-4 Santa Terezinha |  | | Journal (issue) | | INSTITUTE OF AMERICA Emeralds from Northeastern Brazil Diamantine: Coated Cubic Zirconia Precision Measurement...pg. 3 Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil J. C. (Hanco) Zwaan, Dorrit...Polished emeralds from this deposit in northeastern Brazil, discovered in 2006, typically display a saturated...from Pakistan • Cat’s-eye emerald from Belmont, Brazil • Meteorite watches • Purple common opal from Mexico...of the publisher. About the Cover For decades, Brazil has been one of the world’s major sources of fine |
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