 | | Book | | Professor Jacques P. Cassedanne Universidade Federal do Rio de Janeiro For his valuable participation in research...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, |  | Remus, M.V.D., Hartmann, L.A., McNaughton, N.J., Groves, D.I., Reischl, J.L. (2000) Distal Magmatic-Hydrothermal Origin for the Camaquã Cu (Au-Ag) and Santa Maria Pb, Zn (Cu-Ag) Deposits, Southern Brazil. Gondwana Research, 3 (2) 155-174 doi:10.1016/s1342-937x(05)70094-0 | Journal (article/letter/editorial) | | and Santa Maria Pb, Zn (Cu-Ag) Deposits, Southern Brazil M.V.D. Remusl, L.A. Hartmannl, N.J. McNaughton2...Geocie^ncias, Universidade Federal do Xi0 Grande do Sul, Porto Alegre, RS, Brazil 'Centre for Strategic Mineral... Australia 3Companhia Brasileira do Cobre, Porto Alegre, RS, Brazil (Manuscript received March 6, 1999;...an old crustal-basement source during the end of Dom Feliciano Collisional Orogeny, at 594 Ma, late in...above is critical for base-metal exploration in the Sul Riograndense Shield. Previous exploration methodologies |  | | Book | | Occurrence: The Americas 63 USA 64 Mexico 72 Panama 75 Brazil 75 Canada 80 7 Occurrence: Rest of the world 81...all rock types and in most countries. CHALCEDONY Agate (light to dark colours in concentric bands, translucent)...translucent), fire agate (dark agate with play of colour similar to that in opal, opaque), moss agate (pale yellow...quartz crystals come from the State of Minas Gerais, Brazil, and occur in vugs or pockets which are found in...the categories Silex or Kieselstein (including agate, flint opal), Petrosilex or Halleflinta (for jasper |  | | Book (edition) | | and macerals 17. Oil shale, Irati Formation, Dom Pedrito ^1^ 18. Chemistry of oil shales 19. Principal...be piled up against those already formed. Not only do the individual meanders migrate within the meander-belt...hydroxide, which are transported as colloidal solutions do not achieve such wide distribution, since they are...observed between successive horizons in the soil profile do not result solely from an increased maturity of weathering...tropics and subtropics. Well-known examples occur in Brazil, Jamaica, India and West Africa. The occurrence |
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