 | | 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...Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais. Collection of Alvaro Lucio. Photograph taken by...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 |  | | Report (issue) | | Colorado Beryl Collecting Mark I. Jacobson Page 14 Crystal Structure of Beryl and Pezzottaite William "Skip"...August Breithaupt had his seal carved into a beryl crystal. Breithaupt began his studies in 1811, during A...refer, rather than to a given species, to the crystal properties of clarity and luster. The French term...crystals from various alluvial deposits; the largest crystal is about 4 cm wide Collection Eckehard Petsch ...beryl is typically given as Be3 Al2 Si6O 18. The crystal structure consists of Si6O 18 rings, which are |  | | 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,...Collins, King’s College London; John L. Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel...as desirable for cutting gemstones, some fine crystal specimens were produced. Some of the Masisi tourmaline...Junior (BC Gemas do Brasil, Governador Valadares, Brazil), and heating to 500°C in air was successful in |  | | Journal (issue) | | from the Bortolan quarry, Poços de Caldas, Minas Gerais, Brazil . . . . . . . . . . . . . . . . . . . ....specimen known of any microlite-group species; 1.7-cm crystal in lepidolite, from Paprock, Afghanistan. Rob Lavinsky...Congratulations!” Dr. Peter Bancroft, author of Gem and Crystal Treasures I will have many specimens with me in...first, another superb old-time Russian aquamarine crystal about 15 cm long, then a series of old Cornish...occasion the “Duke’s Emerald”—a huge Brazilian crystal, once the largest known—and two amazing silver |  | | Book | | information b Book review c Crystal morphology information d Crystal drawing ff Continues on following...ALSTONITE An occurrence of alstonite at Cave-in-Rock, Illinois (by G. R. Rossman & R. L. Squires) 5:266-269...crandallite from the Alto Benedeto pegmatite, Parai'ba, Brazil (by J.P. Cassedanne & L. Barreto) 22: 183-185 ALTO...Burian goyazite from [Alto Bernardino, Paraiba,] Brazil (by J. S. White, Jr.) 12:379 ALUMOHYDROCALCITE...and muscovite from the Ze Pinto prospect, Minas Gerais, Brazil 21:405-408 --with J.P. Cassedanne: Crystallized |  | | Journal (issue) | | cubic system, the most symmetrical of the seven crystal systems into which all crystalline minerals are...'spear pyrites' describing the typical twinned crystal shapes. Marcasite can be altered to iron pyrite...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 |  | | 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...formula, allegiance to a mineral group, symmetry and crystal structure as well as the strongest X-ray powder...and opaque minerals. More attention is paid to crystal habit or aggregate development and their sizes |  | | Journal (issue) | | being trimmed tends to break through the largest crystal. 3. Untrained observers always wish to touch the...crystals are always found on the largest, hardest rock. 7. In the field, the greatest discoveries are always...down on a stone to rest. Happening to examine the rock, he saw that it was very rich silver ore, and he...separated from it by a rather thick bed of volcanic rock, is the second bed of limestone (Negro limestone)...1.5 cm in diameter bounded by poorly developed crystal faces. Native copper, occurring in the oxidized |  | | 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; |  | | Journal (issue) | | maximum brilliance and weight yield from the rough crystal. Further developments include the introduction...citrine. Figure 7: Early groove cut 17.58 ct rock crystal. Gonard was granted US Patent 946,939 for...carving ('cutting') operation such as that used by crystal glass cutters and engravers. If a series of depressions... is not produced commercially. In an article in Rock V Gem Magazine^ he shows several faceted gems of...Finlayson 7. Algar, C., 2001. Concave faceting. Rock 'n' Gem Magazine, Issue 16, 4-5 8. Personal communication |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | on a knowledge of physical properties such as crystal morphology, color, luster, hardness, cleavage,...edition, all of the interfacial angles from the crystal elements were recalculated, the Miller-Bravais...Mineralogy, Natural History Museum, London, England. Rock H. Currier: Jewel Tunnel Imports, Baldwin Park,...Connecticut. Luiz A. D. Menezes: Belo Horizonte, Minas Gerais, Brazil. William C. Metropolis: Mineralogical Museum...crystallographic data, including structure crystal crystal and powder diffraction results, the morphology |
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