 | Beurlen, H., Thomas, R., Melgarejo, J. C., Da Silva, J. M. R., Rhede, D., Soares, D. R., Da Silva, M. R. R. (2013) Chrysoberyl-sillimanite association from the Roncadeira pegmatite, Borborema Province, Brazil: implications for gemstone exploration. Journal of GEOsciences, 58 (2) 79-90 | Journal (article/letter/editorial) | | from the Roncadeira pegmatite, Borborema Province, Brazil: implications for gemstone exploration Hartmut...Hélio Ramos s.n., 50740–530, Recife, Pernambuco, Brazil; beurlen@ufpe.br Helmholtz-Centre Potsdam, German...Lemos 671, 58100–000, Campina Grande – Paraíba, Brazil Corresponding author The first occurrence of chrysoberyl...Borborema Pegmatite Province (BPP) in northeastern Brazil is reported from up to 0.5 m large boulders in...REL-pegmatite, Seridó Belt, Borborema Province, Brazil Received: 8 February 2013; accepted: 18 June 2013; |  | | Journal (article/letter/editorial) | | ©Springer-Verlag 1990 Origin of emerald deposits of Brazil G. Giuliani 1. 2 , L. J. H. D. Silva 3 and P. Couto...Couto 4 1 2 3 4 ORSTOM, Universidade de Brasilia, Brazil c.R.P.G., 15 Rue N.D. des Pauvres, BP 20, 54501...Metais Ltda, Bahia, Brazil Secretaria das Minas e Energia, C.P.R.M./SGM, Bahia, Brazil Abstract. Precambrian...Precambrian emerald deposits of Brazil are found in a typical geologic setting with Archean basement and supracrustal... Gemstone deposits are of great importance in Brazil. Agate, amethyst, tourmaline, and topaz represent |  | | Journal (article/letter/editorial) | | emerald mines in Colombia are becoming depleted. Brazil currently accounts for approximately 10% of world...samples from the Lened occurrence in Canada, the Muzo mine in Colombia, the Mohmand district in Pakistan, and...export values of emerald rough (Zwaan et al., 2005). Brazil currently accounts for approximately 10% of world...to 0.02% were of gem-quality. 89 Since then the mine has been re-opened and closed several times (Walton...fluorite, beryl, quartz, topaz, arsenopyrite, and cassiterite. The crystals are embedded in granitic cavities |  | | Report (issue) | | crystal weighed 455 kilograms. 2m: The Queen Anne mine in Zimbabwe has produced crystals up to 2 meters...some pegmatites. This specimen, from Minas Gerais, Brazil, is housed in the Deutsches Edelstein Museum in...crystals are found in soils and stream gravels in Brazil. On the other hand, at high temperatures and pressures...greisen deposits, beryl is associated with topaz, cassiterite, and ferberite hiibnerite; whereas in Alpine...surprise. In 1997, Gary and Mary Freeman began to mine the Orchard pit, a then insignificant pegmatite |  | | Book | | Tin Province with Special Reference to the Renison Mine IAIN 22 even ham (With) 5, Big utes) aires erage...235 265 On the Ore-Forming Mechanism of Some Cassiterite-Sulphide Deposits in South China Ye Jun, Zhou...6.3.1 Spectroscopic Analysis and Genesis of Cassiterite Peng Mingsheng, Lu Wenhua, and Zou Zhengguang...Their Paragenetic Association in the Changpo Cassiterite-Sulphide Deposit, Zhuang Autonomous Region of...Metallogenic Features and Model of the Dachang Cassiterite-Sulphide Polymetallic Ore Belt, Guangxi, China |  | | Report (issue) | | beryl and trapiche emerald Rupert Hochleitner Brazil: Minas Gerais, Bahia, Ceara, Goias and Tocantins...Asia: Pakistan, Afghanistan and India .......6 0 Old Mine Emeralds . . . . . . . . . . . . . . . . . . . ...Maharajahs and Maharanis held large emeralds (see "Old Mine Emeralds" page 62). The Color of Islam Emerald...quality. It was the gift of Emperor Dom Pedro I of Brazil to the 6 th Duke of Devon- shire. Also housed...some of the most productive emerald localities in Brazil, for example, more than 77 percent of the emerald |  | | Journal (issue) | | currently the niost important source of emeralds in Brazil, lies northwest of Brasilia, i n the State o f...Institute of the Federal University o f Rio de Janeiro, Brazil; and Mr. Sauer is director o f Lapida~aoAmsterdam...Lapida~aoAmsterdam, S.A., Amsterdam Sauer, Rio de Janeiro, Brazil. 07904 Gemological Institute of America 4 Santa...motivation for many expeditions into the interior of Brazil, all with the hope of discovering emerald deposits...of emeralds before it was exhausted. Today, the mine site is flooded by the waters behind the Sobradinho |
|
