 | | Book | | community does not define mineral varieties so while quartz (a species) is defined and has established physica...names Among the cryptocrystalline varieties of quartz, are the chalcedonies and agates. Some authorities...definitely apply to a type of cryptocrystalline quartz, and is derived from Sardis. the capital of the...mistakenly called Piranha agates) from Rio Grande do Su l, Brazil, are such an agate. Fairburn agates derive...is called quartz. with the chem ical formula of SiO2• Chalcedony is a microcrystalline quartz made up of |  | | 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, |  | | Report (issue) | | United States of America PHOTO CREDITS Cover: Quartz variety amethyst, 10.5 cm tall Goboboseb Mountains...collection, Robert Weldon photo © 2009 GIA Page 2 Quartz variety amethyst, 3.5 cm tall Kakamunurle Mine...collection, Marie-Lan Nguyen photo Upper middle: Quartz variety amethyst (Japan-law twin), 1.6 cm tall...Zillertal Anton Watzl, Sr. photo, circa 2004 Bottom: Quartz variety amethyst, 6.7 cm tall Wattika Mine, Murzinka...the word "amethyst" refers to macrocrystalline quartz that is violet or purple and is derived from the |  | | | | community does not define mineral varieties so while quartz (a species) is defined and has established physical...names Among the cryptocrystalline varieties of quartz, are the chalcedonies and agates. Some authorities...definitely apply to a type of cryptocrystalline quartz, and is derived from Sardis, the capital of the...mistakenly called Piranha agates) from Rio Grande do Sul, Brazil, are such an agate. Fairburn agates derive...is called quartz, with the chemical formula of SiO,. Chalcedony is a microcrystalline quartz made up of |  | | 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,...(Figure 4b), spessartine (Figure 4c), almandine, quartz, zircon, apatite, topaz, sillimanite, fluorite...tourmaline (Figure 4d), aquamarine, spessartine, quartz, topaz, zircon and phenakite are mined. Tourmaline...Saint-Clair Fonseca Junior (BC Gemas do Brasil, Governador Valadares, Brazil), and heating to 500°C in air was |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...Crystal of multicolored tourmaline (84 x 26 mm), Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais...(Camara Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo...pedras preciosas do Brasil Bibliography 1. Gemology 2. Geology 3. Minerals - Brazil 4. Minerals- Classification... Mineralogy 6. Mineralogy - Brazil - History 7. Precious stones - Brazil I. Bartorelli, Andrea. II. Title |  | | Book | | natural, cultured and imitation Alexander E. Fam Quartz Michael O'Donoghue In preparation Amber H. Fraquet...Darragh Topaz D. B. Hoover Butterworths Gem Books Quartz Michael O'Donoghue Butterworths London Boston...O'Donoghue, Michael Quanz.-(Butterworths gem books) I. Quartz I. Title 553.8'7 QE391.Q2 ISBN 0-408-01462-8 Library...O'Donoghue, Michael Quartz (Bunerworths gem books) Bibliography: p. Includes indexes. 1. Quartz. I. Title. II... Preface Even without its gemstone application, quartz is a formidable mineral to survey in a book of |  | | Report (issue) | | Notable Opal Localities Map by Bruce Paul Gaber Do not use this map for navigation. 5 The Opal Enigma:...and possibly even rubellite (tourmaline), or rose quartz. When he used the term amethystos, 6 Pliny was...various varieties of quartz (e.g., prase, chrysoprase, plasma, green jasper), quartz stained with secondary...publicity, that the beads were actually crafted from quartz and feldspar; still, the myth of Leakey's opal...from a variety of materials including feldspar and quartz, but contrary to widespread reports, not a single |  | | Book | | rocks you in space. And life, in a way we still do not entirely understand, only see the eroded outside...observed in transmitted light. Polarization of the Whom do rocks and mountains not awe, who is not fascinated...interruptions. Crystals are omnipresent, although they do not always manifest These are appropriately called...of a golf ball, are found in black slates in the DO US This group of scalenohedric calcite crystals,...then have to be cleaved in a special way QUA T2 Quartz is the mineral silica (SiO,) in its crystalline |  | | Book | | Litchfield County, where good crystals were taken from quartz veins in a variety of metamorphic, plutonic and...Litchfield, where a mass of white quartz on a ridge had once been mined for quartz, and large ilmenite masses...ilmenite crystals to 7 .5 cm in matrix of massive quartz from these dumps-adding that, in his judgment,...incompletely characterized hydromicas-these nebulous species do not form visible crystals and in themselves are never...Watson, Trimble and Cowgill, 1977). LATINAMERICA BRAZIL Jacupiranga mine, Sao Paulo. Among the crystallized |  | | Book (chapter) | | de Venus = acicular rutile + grey Al+H±Li-rich quartz, Novitzky 148 (1951). Ca-bentonite = Ca-rich montmorillonite...cacium-larsenite = esperite, Clark 387 (1993). cacixenite quartz = quartz + acicular rutile, Bukanov 123 (2006). Ca-clinoamphibole...cacoxenite, Dana 6th, 848 (1892). cacoxenite quartz = quartz + fibrous goethite, Sinkankas 227 (1972). Ca-Cr...caesium-diaspodumene = spodumene + hypothetical CsAl[Si2O6] or quartz, MM 25, 626 (1940). Caesiumfeldspat = Cs-rich orthoclase...d'Alençon = transparent quartz, Egleston 60 (1892). caillou de Cayenne = transparent quartz, de Fourestier 56 |  | | Book | | bertrandite, galena, juonniite, orthoclase, pyrrhotite, quartz, tennantite, wolframite, zircon: V. N. Yakovenchuk...names. Since many old collections and references do not adequately distinguish between minerals and other...to maintain consistency. Chemical modifiers that do not denote a separate minerals and related substances...Vivianite, b) mixture of Variscite or Wardite and Quartz [Chalcedony] Ablygonite = a) Amblygonite, b) Montebrasite...[Oligoclose] Ab l 00 = Albite [Plogioclose] Abakusz-Ko = Quartz (Chalcedony] Absite = thorian Brannerite Absah-Gel |  | | Book (edition) | | Mexico D.F .. Milano New Delhi · New York • Paris - Rio de Janeiro. Stockholm. Tokyo. Toronto. Wien. Zurich...334 335 336 337 aim almandine. almandite alpha quartz alpha rays alteration bleke. SJ6kri ta almand1n...form of compressed air. With compressed air you can do almost any job. Faster, cheaper and safer than with...with any other form of power. And if air power can do itAtlas Copco has the right equipment: Everything...~ reg16n aslsm,ca porcenta1e en cenizas. conten,do en cenizas dep6sito de cenizas cen1za(s) p1edra labrada |
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