 | Chaves, Alexandre de Oliveira, Ernst, Richard E., Söderlund, Ulf, Wang, Xinping, Naeraa, Tomas (2019) The 920–900 Ma Bahia-Gangila LIP of the São Francisco and Congo cratons and link with Dashigou-Chulan LIP of North China craton: New insights from U-Pb geochronology and geochemistry. Precambrian Research, 329. 124-137 doi:10.1016/j.precamres.2018.08.023 | Journal (article/letter/editorial) | | of Geosciences – Federal University of Minas Gerais - Brazil. alochaves@yahoo.com.br 2 – Department of...analyses on baddeleyite grains) on the Santa Maria de Itabira gabbroic intrusion. These ages suggest membership...Francisco (SF) and Congo cratons, spanning eastern Brazil and formerly adjacent central Africa. The SF/Congo...Paleomagnetic data from coastal Bahia mafic dykes in Brazil places the SF/Congo craton in moderate to high...Rifting at 920 Ma is recognized for the Araçuaí (Brazil) and West Congo (Africa) regions (Trompette, 1994 |  | | Book | | 1982 Jules Roger Sauer ” 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. “Brazil, Paradise of Gemstones’, by Jules Roger Sauer,...Century. The book is a showcase ofthe best from Brazil and it makes a handsome evocation of what is beautiful |  | | 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...stronger pleochroism is observed in cordierite (iolite, figure 4))where the Fe2++Fe3+ charge transfer...This diagram shows the structure of cordierite (iolite), viewed down the c-axis, as i t relates to pleochroism |  | | 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,...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...Trade in Brazil: A Brief History and Current Status Aurélien Reys Coloured stones from Brazil have been |  | Moreira, Hugo, Cassino, Lucas, Lana, Cristiano, Storey, Craig, Albert, Capucine (2019) Insights into orogenic processes from drab schists and minor intrusions: Southern São Francisco Craton, Brazil. Lithos, 346. 105146 doi:10.1016/j.lithos.2019.07.013 | Journal (article/letter/editorial) | | minor intrusions: Southern São Francisco Craton, Brazil Hugo Moreira, Lucas Cassino, Cristiano Lana, Craig...minor intrusions: Southern São Francisco Craton, Brazil, LITHOS, https://doi.org/10.1016/j.lithos.2019...minor intrusions: Southern São Francisco Craton, Brazil Hugo Moreiraa, Lucas Cassinob, Cristiano Lanab...Geologia, Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, MG 35400-000, Brazil; c Department...Palaeoproterozoic southern São Francisco Craton (SSFC), Brazil using geological relationships and accessory mineral |  | | Journal (issue) | | Era, Minas Gerais, Brazil David Stanley Epstein NOTES AND NEW TECHNIQUES The Growth of Brazil-Twinned...Potential for Synthetic Amethyst Twinned on the Brazil Law John I. Koivula and Emmanuel Fritsch Thermal...LCCAdams, Orleans, MA; Luiz Angelo, Rio de Janeiro, Brazil; Trea Arendsen, Lansing, MI; Scott M. Azmus, Corvallis...Morris, Newark, CA; Francisco Muller Bastos, Minas Gerais, Brazil; Colleen Witthoeft Nayuki, Montreal, Que...Gem-Bearing Pegmatites: A Review Gem Pegmatites of Minas Gerais, Brazil: Exploration, Occurrence, and Aquamarine |  | | Journal (issue) | | Namibia, as well as Madagascar), South America (Brazil and Colombia), central and southern Asia (Sri Lanka...Pakistan; and pink to red tourmalines from Nigeria and Brazil. Diamond was mined in northern Canada for the first...benitoite, charoite, chrome diopside, feldspar, iolite, lapis lazuli, maw sit sit, red beryl, rhodochrosite...mining also continued at traditional sources in Brazil and Africa. Large quantities of Brazilian emeralds...the early ’90s, particularly from Goiás and Minas Gerais (primarily the Nova Era area). By the middle |  | | Journal (issue) | | unlikely for true sapphire but could be applicable to iolite, aquamarine, or topaz. He repeats his previous..."watersaphire" is certainly neither corundum nor iolite; under the above misnomer it has for many years...Angled growth structure in natural amethyst from Brazil; planes parallel to the positive rhombohedra r...in natural citrine (heattreated amethyst) from Brazil; adjacent planes parallel to the positive rhombohedron...the c-axis. 40x. Polysynthetic twinning of the Brazil law, which is also a characteristic feature of |  | Simon, Maurício Bulhões, Marques Bongiolo, Everton, Ávila, Ciro Alexandre, Oliveira, Elson Paiva, Teixeira, Wilson, Stohler, Rômulo Campos, Soares de Oliveira, Filipe Vidal (2018) Neoarchean reworking of TTG-like crust in the southernmost portion of the São Francisco Craton: U-Pb zircon dating and geochemical evidence from the São Tiago Batholith. Precambrian Research, 314. 353-376 doi:10.1016/j.precamres.2018.06.015 | Journal (article/letter/editorial) | | Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil 2 Instituto de Geociências, Universidade Federal...RJ, Brazil 3 Museu Nacional, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil 4 ...Campinas, SP, Brazil 5 Instituto de Geociências, Universidade de São Paulo, São Paulo, SP, Brazil 6 Petrobras...de Janeiro, RJ, Brazil 7 Petrobras, E&P-EXP/AFOE/ADGP, Rio de Janeiro, RJ, Brazil Abstract Field...last Archean magmatic pulse of the region. The Minas strata along the Jeceaba-Bom Sucesso lineament |  | | Journal (issue) | | Centre, Federal University of Ouro Preto, Minas Gerais, Brazil **University of Mainz, FRG 1. Introduction...been the most important emerald mining region in Brazil until the discovery of the Santa Terezinha occurrence...investigations carried out on request of the Secretaria das Minas e Energia, performed by the Companhia Baiana de...emeralds of different j Brazilian occurrences. * 1: Itabira/MG; Hänni, Schwarz and Fischer (1987) * 2: Taua/CE;...1987. The emeralds of the Belmont Mine, Minas Gerais, Brazil. J. Gemm., 20(7/ 8), 446-56. Inda, H.A.V |  | Cardoso, Carolina Dantas, Ávila, Ciro Alexandre, Neumann, Reiner, Oliveira, Elson Paiva, Valeriano, Claudio de Morisson, Dussin, Ivo Antônio (2019) A Rhyacian continental arc during the evolution of the Mineiro belt, Brazil: Constraints from the Rio Grande and Brumado metadiorites. Lithos, 326. 246-264 doi:10.1016/j.lithos.2018.12.025 | Journal (article/letter/editorial) | | continental arc during the evolution of the MINEIRO belt, Brazil: Constraints from the Rio Grande and BRUMADO METADIORITES...continental arc during the evolution of the MINEIRO belt, Brazil: Constraints from the Rio Grande and BRUMADO METADIORITES...CONTINENTAL ARC DURING THE EVOLUTION OF THE MINEIRO BELT, BRAZIL: CONSTRAINTS FROM THE RIO GRANDE AND BRUMADO METADIORITES... of Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil Department of Geology and Paleontology, National... NU b de Janeiro, Rio de Janeiro - UFRJ, RJ, Brazil Centre for Mineral Technology - CETEM, Division |  | | 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 (issue) | | iridescence observed in “rainbow” hematite from Minas Gerais, Brazil. 40 DNA Techniques Applied to the Identification...iridescence in metamorphic “rainbow” hematite from Brazil. The authors use electron microscopy, atomic force...colored by GR1 defects have been alluvial deposits in Brazil, Guyana, Venezuela, Zimbabwe, the Central African...never graded by GIA), and the 5.03 ct Aurora Green (Brazil), which sold at auction in 2016 for more than US...America has yielded a number of green diamonds from Brazil and Guyana (figure 7). Most show extensive surficial |  | | Journal (issue) | | Rossman The Indaia Sapphire Deposits of Minas Gerais, Brazil David S. Epstein, Warren Brennan, and Tulio...located in eastern Bolivia, near the border with Brazil [figure 2). The Anahi mine produces ametrine crystals...1986) described similar material purportedly from Brazil. There are also some accounts that the deposit...Anahi area and on importing the gem material into Brazil, early reports identified the source as being in...virtually impossible for gems mined in Bolivia to enter Brazil legally. To circumvent these restrictions, the |  | | Journal (issue) | | BANK, F.H., 1987. A new alexandrite deposit in Brazil. Goldschmiedezeitung, 9, 91-2. A find of alexandrite...been made at Era Nova, near Belo Horizonte, Minas Gerais, Brazil. Some stones show a colour change from green...M. BROWN, G., 1987. Iolite. Wahroongai News, 21, 5, 20-3.6 figs. Facts on iolite or cordierite, a gem...of fine quality topaz in the Brazilian state of Minas Gérais are described. M.O'D. CLUNAS, C., 1987. Jade...figs in colour. Alexandrite from a new find in Minas Gérais, colour change similar to fine Russian stones |  | | Journal (issue) | | geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production... Svisero, James E. Shigley, and Robert Weldon Brazil, which commanded global production in the 1700s...principally in the states of Minas Gerais and Mato Grosso, are presented. W hile Brazil is widely known for...Tijuco (later named Diamantina) in the state of Minas Gerais (Calógeras, 1904; Leonardos, 1959; Barbosa,...and Bartorelli, 2010). For the next 150 years, Minas Gerais was the world’s major supplier of gem diamonds |  | | Book | | cm Page 251: Calcite, Irai, Rio Grande do Sul, Brazil * 12.5 x 10 x 10.5 cm Page 252: Gypsum rosette...environment. solidified. In some basalts of India and Brazil, these cavities are large enough for a person...before it ABOVE: Imperial topaz, Ouro Preto, Minas Gerais, Brazil * 3.3 x 2.7 x 1.8 cm, 159.10 ct RIGHT: Round...Fluorapatite Topaz Topaz, Téofilo Otoni, Minas Gerais, Brazil - 14.5 x 14x 13.5 cm Hardness 6 Hardness...Bahia, Brazil + 5 x 3 x 0.6 cm Platy muscovite, José Pinto Mine, Jaguaragu, Minas Gerais, Brazil + 12 | | | Book | | cm Page 251: Calcite, Irai, Rio Grande do Sul, Brazil * 12.5 x 10 x 10.5 em Page 252: Gypsum rosette...environment. solidified. In some basalts of India and Brazil, these cavities are large enough for a person...before it ABOVE: Imperial topaz, Ouro Preto, Minas Gerais, Brazil ° 3.3 x 2.7 x 1.8 om, 159.10 ct RIGHT: Round...Bahia, Brazil * 5 x 3 x 0.6 cm Platy muscovite, José Pinto Mine, Jaguaracu, Minas Gerais, Brazil * 12...South Wales, Australia * 7 x 6 x 6 cm Epidote, Brazil * 7 x 75 x Reniform In this habit, minerals form |  | | Journal (issue) | | ARTICLES 260 An Update on “Paraíba” Tourmaline from Brazil James E. Shigley, Brian C. Cook, Brendan M. Laurs...from Madagascar • Iolite and corundum from Wyoming • Green kyanite from Bahia, Brazil • “Ruby Rock” cabochons...More recently, Brendan has visited Madagascar and Brazil to obtain first-hand knowledge of important gem...of gemological topics: “Paraíba” tourmaline from Brazil, spessartine garnet from California, Malaya garnet...2001 259 AN UPDATE ON “PARAÍBA” TOURMALINE FROM BRAZIL By James E. Shigley, Brian C. Cook, Brendan M. |  | | Journal (issue) | | from Brazil shows chatoyancy caused by flat hollow channels. Four-rayed star aquamarine from Brazil has...the c-axis. A tourmaline-quartz combination from Brazil has an iridescent chatoyancy Grey orthoclase moonstone...cat's-eye from Brazil A very unusual example of a cat's-eye was purchased in Brazil by the author in...measuring Figure 1: Chatoyant pale blue topaz from Brazil weighing 152.15 ct. Photo by J. Hyrsl. 32.94 x...described two topaz cat'seyes, one blue of 7.98 ct from Brazil and another colourless of 12.20 ct from Sri Lanka |  | | Journal (issue) | | The new type of haematite rock originating from Brazil has an Fe content of 69% Fe. Iron ores similar...Quadrilátero Ferrífero area near Ouro Preto, Minas Gerais, Brazil. INTRODUCTION In recent months cut and...polished section of high-grade haematite ore from Brazil. Greyish-white and light grey: haematite; dark...haematite type originates mainly from two mines in Brazil; however, the exact locations of the mines were...Quadrilâtero Ferrifero near Ouro Preto, Minas Gérais, Brazil. In this mining area, a massive type of |  | | 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...market for previously little-known gems, such as iolite, sunstone, and others. One such stone, sold almost...discovered in Paraíba and Rio Grande do Norte states in Brazil in 1989 (Fritsch et al., 1990) and became known |  | | Journal (issue) | | Santa Maria mine, Brazil; (2) 20.10-ct peridot, Burma; (3) 21.09-ct kunzite, Brazil; (4) 8.14-ct grossular... California; (6) 15.18-ct tourmaline, Paraiba, Brazil; (7) 10.42-ct tanzanite, Tanzania; (8) 6.09-ct...38-ct ruby, Burma; (17) 3.08ct tourmaline, Paraiba, Brazil; (18) 1.85-ct fancy purple-pink diamond, Argyle...number of new localities. Fine alexandrites from Brazil, sapphires from Southeast Asia and Australia, emeralds...pegmatite gemstones (tourmaline, aquamarine, etc.) from Brazil, Pakistan, Afghanistan, and several countries in |  | | Journal (issue) | | ........................................... 13 Brazil .................................................Lapidary, Hong Kong; CMP Asia, Hong Kong; GEA, Brazil; Emmanuel Piat, France; Israel Emerald Cutters...DIRECTORS Andrew Cody, Australia Sergio Martins, Brazil Emmanuel Piat, France Constantin Wild, Germany...to improve the color. Some kunzite buyers from Brazil also discovered that rough crystals they purchased... CY CMY K 2006 MINING REPORT C ompared to Brazil, its land-locked neighbor, Bolivia is a small country—it |  | | Journal (issue) | | (Miku) (Sandawana) (Mingora) Oxide la Ob 3c 4= Brazil (Salininha) 5c SiO, 62.23 63.84 65.0 A1203 15...Australia Poona Brazil Bahia Anag6 Brumado Carnaiba Salininha, Pilao Arcado Minas Gerais Unspecified localities...localities Itabira India Ajmer Colombia Burbar Chivor Muzo Mozambique Morrua (Melela) Norway Eidsvold...in synthetic emeralds grown by the flux method. IOLITE, An Unusual Cat's-eye The staff at the Santa Monica...examine an attractive, translucent, grayish blue oval iolite cabochon Figure 8. Specimen manufactured out of |
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Itabira, Minas Gerais, Brazil