 | | Journal (article/letter/editorial) | | SOC. AM., VOL. 57 FIGURE 1. BATATEIRAS, BAHIA Wall rock is sandstone. Note sandstone inclusion in vein...MINAS GERAIS Wall rock is decomposed Bambui shale. FIGURE 2. BATATEIRAS, BAHIA Wall rock is sandstone. ...FIGURE 4. SAO PEDRO MINE, CRISTALINA, GOIAZ Wall rock is sandstone. Photo by E. II. Payne. Fir.uHi-:...MINE, BAIIIA Outcrop Map of Onca-Pacu Crystal Mines Area, Sete Lag6aa, Minaa By H.K-5hearerfQeoloqt3t-...by quartz with terminations of inwardly growing crystal intergrown with those which grow from the opposite |  | | 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,...turquoise vein near the village of Casa Nova, in Bahia, later flooded by the waters of the Sobradinho dam |  | | Book | | take the collector or fossicker to the sites of crystal occurrences. Such detailed guidance is not possible...Occurrence: The Americas 63 USA 64 Mexico 72 Panama 75 Brazil 75 Canada 80 7 Occurrence: Rest of the world 81...QUARTZ Varieties Habit Pleochroism Occurrence Rock crystal (colourless), amethyst (violet-purple), citrine...quartzite (a whitish rock, fine-grained, opaque). Single crystal specimens of rock crystal, amethyst, citrine...in amethyst (blue, reddish-violet). In almost all rock types and in most countries. CHALCEDONY Agate (light |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...EDITING Courtesy of Ian McReath Spine photograph: Crystal of multicolored tourmaline (84 x 26 mm), Lavra...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 | | Modern emerald and beryl jewellery Chapter 4 67 Crystal structures and chemical composition The beryl structure...184 Argentina 184 Australia 185 Austria 187 179 Brazil 189 Colombia 195 India 197 Malagasy Republic Mexico...Morganite (pink) 1.586-—1.594 Chemical composition Crystal system Optical clarity Be3Al.(SiO3), Hexagonal...=Aquamarine; Brazil, India, Malagasy Republic, Namibia, USA, USSR. Bixbite; USA (rare) Emerald; Brazil, Colombia...Malagasy Republic, Brazil, USA (rare) Heliodor; Brazil, Malagasy Republic, Namibia Maxixe; Brazil (rare) Morganite; |  | | Book | | Rubellite Nephrite Thetis Hair Stone 187 Rock Crystal 235 235 210 210 211 211 212 Sunstone 212...avoided the need for costly excavation of hard rock; only simple, inexpensive processes that separated...materials Quartz crystals from Corinto, Minas Gerais, Brazil. Height: 15 cm. Sorbonne collection using gravity...adornment in a broader sense: a bud on a plant, a crystal in a metal vein, a precious stone worn by someone...Washing diamond-bearing gravel in Minas Gerais, Brazil. Photo: tals of such minerals as quartz, fluorite |  | | Book | | the structure, and of lore. Christian the crystal color. lan- signif- chemical optical properties...part is anywhere an beryl deposits, of fine crystal Sinkankas has in the literature, encyclopedic...90 Emerald Lore in Colombia and Peru, 5. 93 Crystal Structure Chemical Composition of and Beryl...Deviations 371 Bolivia, 377 332 Proportions Brazil, 378 Angles of Faceted Bulgaria, 399 333 Burma... Cajon, Schmetzer, Heidelberg, De Janeiro, Brazil; Geological ton, VA; seum, Marie and Germany; |
|
