 | | Journal (article/letter/editorial) | | [Laurentian University] at 02:10 27 October 2013 Minas Gerais, Brazil O ne of the most interesting and at times...pressure fields; the remaining two members, sillimanite and andalusite, are also familiar to many collectors...Cr, Fe, Mg, Ca, and K. It is a member of the sillimanite group and is trimorphous (having the same chemical...but a different structure) with andalusite and sillimanite. Kyanite is widely distributed in gneisses and...psuedomorphs of kyanite after andalusite and sillimanite are known from scattered locations. There are |  | | Journal (issue) | | Alexandrite from the Pegmatite Districts of Minas Gerais, Brazil Keith Proctor 33 Faceting Large Gemstones...alexandrites near the town of Hematita in Minas Gerais, Brazil; in less than three months in 1987, more...aquamarine, like the material from Coronel Murta (Brazil) and Tongafeno (Malagasy Republic). As we have...beryl originally found at the Maxixe mine in Minas Gerais, Brazil, is colored by a similar but different defect...ALEXANDRITE FROM T H E PEGMATITE DISTRICTS OF MINAS GERAIS, BRAZIL By Keith Proctor This fourth article in |  | | Journal (article/letter/editorial) | | Granitoid Plutons of the Araquai Orogen, Southeastern Brazil: Tectonic Implications Veridiana T. de S. Martins'... 05508-080, Brazil CPMTC, fnstituto de GeociEncias, Universidade Federal de Minus Gerais, Belo Horizonte...Horizonte, M G , 31270-902, Brazil, E-mail: veridianausp. br (Manuscript received August 29,2002; accepted...northeastern region of the State of Minas Gerais, southeastern Brazil. The Araquai Orogen borders the SZo...Nd OF BRASILIANO GRANITOID PLUTONS SOUTHEASTERN BRAZIL a Archean-Paleoproterozoicbasement reworked during |  | | Journal (issue) | | County, Virginia, Virginia, Minas Minas Gerais, Gerais, Brazil, Brazil, Madagascar, Madagascar, Sri...1.802(3) Taita Hills, Kenya 2 1.795-1.809 Minas Gerais, Brazil3 1.803-1.805 4 Composition Garnets...Brazil:chemical chemicalcharacter characterand and Brazil: thermal behaviour behaviour thermal 1 1 2 2 3...Ouro Preto, MG, Brazil Universidade Federal dede Ouro Preto, 35400, Ouro Preto, MG, Brazil ABSTRACT: Imperial...town Ouro Preto, Minas Gerais, Brazil. town of of Ouro Preto, Minas Gerais, Brazil. Thetwo twomost mostimportant |  | | Journal (issue) | | 32 Purple to Reddish Purple Chrysoberyl from Brazil 42 Identification Characteristics of Natural...Cat’s-eye Apatite from Brazil Intense blue apatite is known from Minas Gerais, Brazil, and cat’s-eye stones...Epstein (Precious Resources Ltda., Teófilo Otoni, Brazil). He reported that the material was found in January...These cat’s-eye apatites (2.45 and 3.80 ct) from Brazil are colourless, which is highly unusual for this...the origin of the unusual rough material within Brazil is unknown. Brendan M. Laurs Reference O’Donoghue |  | Richter, Fabiana, Lana, Cristiano, Stevens, Gary, Buick, Ian, Pedrosa-Soares, Antônio Carlos, Alkmim, Fernando Flecha, Cutts, Kathryn (2016) Sedimentation, metamorphism and granite generation in a back-arc region: Records from the Ediacaran Nova Venécia Complex (Araçuaí Orogen, Southeastern Brazil) Precambrian Research, 272. 78-100 doi:10.1016/j.precamres.2015.10.012 | Journal (article/letter/editorial) | | Venécia Complex (Araçuaí Orogen, Southeastern Brazil) Fabiana Richter a,∗ , Cristiano Lana a , Gary...Universidade Federal de Ouro Preto, Ouro Preto, Brazil Department of Earth Sciences, Stellenbosch University...Geociencias, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil b a r t i c l e i n f o Article...the Araçuaí Orogen (AO, 630–480 Ma), southeast Brazil, exposes a mid-crustal section with abundant evidence...2004), its type example, the Araçuaí Orogen (AO, Brazil), still lacks detailed investigation. Studies on |  | | Journal (issue) | | Articles 708 Coloured Stone Mining and Trade in Brazil: A Brief History and Current Status By Aurélien...Collection V. L. Villani photo p. 758 Cover Photo: Brazil is the source of a variety of coloured stones,... almandine, quartz, zircon, apatite, topaz, sillimanite, fluorite, chrysoberyl, chal- For more than...Junior (BC Gemas do Brasil, Governador Valadares, Brazil), and heating to 500°C in air was successful in...it is likely to have been Rio Grande do Sul in Brazil, well known for its amethyst, agate and jasper |  | | Journal (issue) | | APRIL 1993 Cover Picture The Hematita mine in Minas Gérais in 1987 - probably the richest alexandrite...deposits of alexandrite, cat's-eye and chrysoberyl in Brazil' pp. 333-54) ISSN: 0022-1252 F.G.A. your key...deposits of alexandrite, cat's-eye and chrysoberyl in Brazil JacquesCassedanne, Cassedanne, D.Sc.,* Maurice...Fundiio, Fundão, 21,910, Rio de Janeiro, Janeiro, Brazil *Institute of Geosciences UFRJ-CNPq, Cidade Universitaria...Ipanema, 22,410, 22,410, Rio de Janeiro, Janeiro, Brazil **Maurice Roditi Jewellers, distinguished: Abstract |  | | Journal (article/letter/editorial) | | Ultra-high-temperature metamorphism in Central Brazil: the Barro Alto complex R. DE MORAES AND R. A....70910-900 Brazil (e-mail: moraes@unb.br) ABSTRACT The Barro Alto complex, central Brazil, is a layered...either orthopyroxene+sillimanite or garnet+sillimanite. Quartz+biotite±sillimanite±garnet symplectites...spinel+quartz±cordierite by orthopyroxene+sillimanite or garnet+sillimanite occurred around the [Sa] invariant...°C. Key words: Barro Alto complex, Brazil; orthopyroxene+sillimanite; spinel+quartz; ultra-hightemperature |  | | Journal (issue) | | and Anthony R. Kampf Gem Pegmatites of Minas Gerais, Brazil: Exploration, Occurrence, and Aquamarine...the northeastern section of the state of Minas Gemis, Brazil. The history of gem exploration and m i n...Te6filo Otoni-Marambaia pegmatite district of Minas Gerais. As is common with most aquamarines, the stones...gem pegmatite regions of the 20th century: Minas Gerais, Brazil. With these articles, we hope to take you...what pegmatite gems have meant historically in Brazil and the production of one very important pegmatite |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...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 |  | Török, K., De Vivo, B., Nilson, A. A., Lima, A., Zuppetta, A. (2002) Mineralogy and Petrology, 76 (1) 75-98 doi:10.1007/s007100200033 | Journal (article/letter/editorial) | | NiquelaÃndia and Barro Alto Complexes, Goias State, Brazil K. ToÈroÈk1 , B. De Vivo2 , A. A. Nilson3 , A....Petrologia, Universidade de Brasilia, Brasilia, Brazil 4 Universita degli Studi del Sannio, Benevento...complexes, Niquel^andia and Barro Alto, GoiaÂs State, Brazil record multiple ¯uid in¯ux events from the magmatic...Alto ma®c-ultrama®c complexes in GoiaÂs State, Brazil are known mainly for their lateritic nickel occurrences...complexes are situated in middle-north GoiaÂs, Brazil (Fig. 1); ma®c-ultrama®c rocks, metamorphosed from |  | | Report (volume) | | Pernambuco, Recife, Brazil J. S. BETTENCOURT Universidade de Sao Paulo, Brazil C. P. DE CAMPOS Lud...FERREIRA Federal University of Pernambuco, Recife, Brazil 2011 Published by The Geological Society London...(Iran), Asia (Japan and China) and South America (Brazil and Argentina) and spanning rocks from Palaeoproterozoic...–Cambrian granitic magmatism in the Araçuaı́ orogen (Brazil), the Eastern Brazilian Pegmatite Province and...7852, Cidade Universitaria, 50670-000 Recife, PE, Brazil 2 Institute of Geosciences, University of São |  | | Journal (issue) | | AND MARKETS Figure 9. Near Nova Era in Minas Gerais, Brazil, the Belmont mine operates using sophisticated...other mines in the area slowed (Weldon, 2006). Brazil witnessed a sustained slump in overall gemstone...in places like the United Arab Emirates, Russia, Brazil, India, and China—locations that would not have...discovered in Paraíba and Rio Grande do Norte states in Brazil in 1989 (Fritsch et al., 1990) and became known...plummeted, mining operations in key centers such as Brazil and Zambia curtailed or ceased production, though |  | | Journal (issue) | | Ceylon. (3) Euclase crystal, 1.8 cm, from Minas Gerais, Brazil. (4) Humite, 2.3 cm, from Mount Somma, Italy...Italy. (5) Palladium, 2.1 cm, from Brazil. (6) Mellite, 2.5 cm, from Thuringia, Germany (?). (7) Aragonite...probably from the Jequitinhonha River area, Minas Gerais, Brazil. 4 Refined Elegance, a Supplement to The...Topaz, 2 cm, from Minas Gerais, Brazil. (10) Chrysoberyl, 2.4 cm, from Minas Gerais, Brazil. (11) Euclase...Euclase, 2.1 cm, from Minas Gerais, Brazil. (12) Olivine, 2.7 cm, from St. John’s Island, Egypt. given the |  | Cordeiro, Pedro Filipe de Oliveira, de Oliveira, Claudinei Gouveia, Giustina, Maria Emília Schutesky Della, Dantas, Elton Luis, dos Santos, Roberto Ventura (2014) The Paleoproterozoic Campinorte Arc: Tectonic evolution of a Central Brazil pre-Columbia orogeny. Precambrian Research, 251. 49-61 doi:10.1016/j.precamres.2014.06.002 | Journal (article/letter/editorial) | | Campinorte Arc: Tectonic evolution of a Central Brazil pre-Columbia orogeny Pedro Filipe de Oliveira Cordeiro...Universidade de Brasília, 70910-900 Brasília, DF, Brazil a r t i c l e i n f o Article history: Received...Bois Fault in the northern Brasília Belt, Central Brazil. The Campinorte Arc is divided into Pau de Mel...supercontinent amalgamation events. The Central Brazil northern Brasilia Belt basement encompasses evidence...and São Luis Craton (Klein and Moura, 2008), in Brazil; the Dahomeyide Belt in Africa (Agbossoumoundé |  | | Book | | Alkmim Editors São Francisco Craton, Eastern Brazil Tectonic Genealogy of a Miniature Continent Regional...Alkmim • Editors São Francisco Craton, Eastern Brazil Tectonic Genealogy of a Miniature Continent 123...Janeiro Maracanã, Rio de Janeiro Brazil Fernando F. Alkmim Escola de Minas Universidade Federal de Ouro...Preto Ouro Preto Brazil Umberto G. Cordani Universidade de São Paulo São Paulo Brazil ISSN 2364-6438...significant contributor to the mining industry in Brazil. This book provides a state of knowledge overview |  | | Book | | 204 Sinhalite 177 Petrified Wood 202 203 Sillimanite (Fibrolite) 174 Petalite Serpentine Siberite...materials Quartz crystals from Corinto, Minas Gerais, Brazil. Height: 15 cm. Sorbonne collection using...crys- Washing diamond-bearing gravel in Minas Gerais, Brazil. Photo: tals of such minerals as quartz...phrase ‘‘gem quality’ to de- from Salinas, Minas Gerais, well as an ‘‘ornamental stone.’ Amethyst...and a jeweler might then speak of a ‘root’ as Brazil Length: 9 cm. K. Proctor collection, United States |  | | Journal (issue) | | SEPTEMBER–OCTOBER 2019 Articles The Golconda District, Minas Gerais, Brazil ..........................................TOURMALINE, 11.9 cm, from the Golconda I mine, Minas Gerais, Brazil Brice Gobin (Mineral Art) and Emanuele Marini...China, South Africa, Namibia, Chile, Peru, Bolivia, Brazil and Mexico. His first exchange of specimens with...September–October, 2019 The Golconda District Minas Gerais, Brazil Carlos Cornejo1 Andrea Bartorelli2 Wendell...important specimen-producing districts in all of Brazil. INTRODUCTION The Golconda Pegmatite Field is a |  | | Journal (issue) | | Well-formed crystals also occur in Peru, Bolivia, Chile, Brazil, Japan and Mexico. 'Sand dollars' are particularly...was the rose cut. The discovery of diamonds in Brazil in the early decades of the eighteenth century...diamond-cutting industry based on rough being imported from Brazil. Bauer39 also quotes Geneva as the source of cut... A kunzit e cat's-eye weig hing 113.32 ct from Brazil is described as are phosgenites from Morocco. Schungite...location, geology and mineralogy of gem tourmalines in Brazil SOLOMONOV, V.I., MIKHAILOV, S.G., OSIPOV, V.V. |  | | Journal (issue) | | Meta-Autunite, Sao Pedro mine, Malacacheta, Minas Gerais, Brazil, 2.0 x 2.1 x 1.5 cm, Mark Mauthner...mile northeast of Elwyn. Wissahickon gneiss: sillimanite, cyanite, staurolite. Crump’s Quarry, on the |  | | Journal (article/letter/editorial) | | The Pederneira Mine São José da Safira, Minas Gerais, Brazil Dedication This article is the culmination...Pederneira Mine ▲ ▲ São José da Safira, Minas Gerais, Brazil Daniel Trinchillo Fine Minerals International...Tallis). Introduction The Pederneira mine in Brazil qualifies as one of the world’s greatest tourmaline...specimen recently recovered at the Pederneira mine in Brazil. It was handed to me by long-time mineral dealer...parents’ home on his way back from a two-month tour of Brazil. The photo knocked my socks off! The dialog went |  | | Book (edition) | | Salinas, Peru, H Variscite, xx 5 mm, Iturnbiara, Brazil, H Rhodocbrosite, polished, 50 mm, Capillitas,... China, H Page 1: MuscO\ite. 45 mm, Linopolis, Brazil, H Page 2: Vivianite, I 00 mm, Huanzala, Bolivia...Ethiopia, G Page 12: Brazilianite, 35 mm, Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California...mine. Edwards. St. blue masses at Brumado Bahia, Brazil. At SchneeLawrenceco.. NewYork.andon LakeHarbour...Mts., Germany. ~n Au veins_at Mo1To Velho. Minas Gerais, Brazil. With tourmaline, muscovite-fuchsite,apatite |  | | Book | | gem minerals nephrite, kyanite, staurolite and sillimanite. Many of these minerals, too, are recovered from...indicating a carbonaceous material. Emeralds from Brazil are usually full of thin liquid films and there...noticed in a goshenite (colourless beryl) from Brazil and in the same crystal a manganese apatite and...always twinned according to two different laws: the Brazil twin in which left- and righthanded crystals interpenetrate...heat-treatment of some brownish material from Ouro Preto, Brazil; it contains sufficient chromium to show a red |  | | Book (edition) | | yellow-chocolate gems include Bronzite, Cats Eye Sillimanite, Cognac Quartz, Epidote, Idocrase, Kornerupine...Quartzite, Sard, Scheelite, Sillimanite, Star Diopside, Star Sillimanite, Star Sunstone, Unakite, Yellow...Rubellite MEXICO NIGERIA e— TAHITI Tahitian Pearl BRAZIL Agate TANZANIA Amethyst AAA Tanzanian Ruby AAA...Serpentine - = = = Sillimanite Cat's Eye Sillimanite - - - Star Sillimanite - - - - - - -...quality, which makes absolutely no sense to me. While Brazil, Burma, Madagascar, Mozambique, Sri Lanka, Tanzania |
|
