 | | Book | | until he managed to reach the land of his dreams, Brazil. A specialist in the field of geology and mineralogy...Honoris Causa. Deeply convinced that every giant crystal is like a “stone book” carrying in it invaluable...collector's passion and his undying love for the crystal phenomena of minerals are the basic stimulus for...crystals and the remarkable mineral treasures of Brazil, as well as the incredible adventures and difficulties...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL Cyan Magenta Yellow Black 1 Delev Ilia Deleff |  | | Journal (issue) | | device|Melee Inspector| Presidium Synthetic Diamond Screener II|SYNTHdetect mounted diamond screening device|CIBJO...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...Gemmological Association of Great Britain ISSN: 1355-4565 ii Cert no. TT-COC-002454 Understanding Gems ™ The |  | | 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 | | 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,...Grande do Norte, in 1953, the precious opals of Pedro I] in Piaui, in 1960, and a turquoise vein near |  | | Report (issue) | | same name. It has been suggested that an irised rock crystal, that is one in which there is a crack that...turned to other projects. The outbreak of World War II delayed the publication of the Leakey's scientific...an amorphous substance, meaning that it lacks a crystal structure. As such, opal is properly termed a mineraloid...spectral display. Elements incorporated into the crystal lattice are the source of color in most minerals...deposited on fine-grained, clay-rich sedimentary rock layers of varying grain size from clay-size to conglomerates |  | | Book | | the Earth What is a mineral? Physical properties Crystal systems and habits What is a gem? Visual properties...and medicine Quartz Treasure chambers of Augustus II Surface lustre St George statuette Chalcedony Frederick...Andes Emerald Topkapi emerald dagger Beryl Dom Pedro Aquamarine Modern carving and engraving Danburite...300 302 304 306 308 309 310 312 314 316 318 319 ROCK GEMS AND ROCKS 320 Moldavite Obsidian Limestone...derived matter, such as Three rock types Minerals Bevelled, tabular crystal, typical of the mineral wulfenite |  | | Journal (issue) | | VOLUME 22 NUMBER SIX APRIL 1991 Cover Picture A crystal of emerald on calcite from Muzo, Colombia, from...Dr Campbell Smith on curatorial duties with the rock collections and continued his studies of Scottish...discovery of another new mineral, painite, found as a crystal by A.CD. Pain at Mogok in Burma and named in his...6 1991,22, 6 334 Gem thaumasite from the Black Rock Mine, South South Mrica Africa Ulrich Henn, Markus...growth-zoning growth-zoning in in a Black Black Rock Rock thaumasite. xlO. Fig. 3. 3. Distinct Distinct |  | | Journal (issue) | | element geochemistry of emerald and associated country-rock. A summary of certain aspects of this investigation...spectrographic analyses of the emeralds and enclosing country rock, are admirably recorded by Martin (1962). T h e...potential colouring elements are present in the host rock. (3) T h e alkali content of the emeralds is of...molecules, and so directly increase the density of the crystal as the unit cell size is not significantly increased...represents an increase over what is present in the host rock. Ideally, to obtain this information one should |  | | Book | | the Earth What is a mineral? Physical properties Crystal systems and habits What is a gem? Visual properties...and medicine Quartz Treasure chambers of Augustus II Surface luster St. George statuette Chalcedony Frederick...Andes Emerald Topkapi emerald dagger Beryl Dom Pedro Aquamarine Modern carving and engraving Danburite...300 302 304 306 308 309 310 312 314 316 318 319 ROCK GEMS AND ROCKS 320 Moldavite Obsidian Limestone...326 328 329 330 332 334 Color guide Mineral and rock directory Glossary Index Acknowledgments 338 348 |  | | Journal (issue) | | Emerald Business in Colombia Focus on Brazil 36 30 Booming Brazil – A Rising Star in the Jewelry Industry...Gemstones 52 Interesting New Gemological Finds in Brazil Mining 62 Andesine in Tibet – A Second Field...and secondary deposits (found in sedimentary, soft-rock, placers). The mineralogy of a gem dictates the...Oliveira (2005) describes cases in Campos Verdes, Brazil where inexpensive projects have resulted in concrete...Mining and Local Development: Three Case Studies in Brazil, 31pp. • Sarassin, B., 2006. The mining industry |  | | Book (edition) | | Gem Materials 3 40 Part II 3 4 5 6 7 8 9 10 11 12 13 14 Diamond I Diamond II Ruby and Sapphire Beryl...mantle lies the Earth’s crust, a ‘thin’ skin of rock, less dense than the mantle, and derived from it...wide range of simple to complex rock structures. This range of rock types and their inter-relationships...inorganic, with a specific chemical composition and crystal structure. Minerals with the qualities of beauty...mantle are so hot that parts may melt to form molten rock or magma. When magma cools, it forms igneous rocks |  | | 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 |  | | 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...mining also continued at traditional sources in Brazil and Africa. Large quantities of Brazilian emeralds...reserves and reduced demand. Emerald production in Brazil has since continued to decline. Several sources...especially a problem for emeralds from Colombia and Brazil, which led to greater market demand for African |  | | Journal (issue) | | mauve, violet, blue, blue-green and purple with crystal forms which have been magmatically magmatic ally...Ruby series crystal Figure Pale pink and ruby corundum Figure series corundum corundum crystal Figure 10:...radiating in in bunches, bunches, like like crystal crystal axes, axes, from from aa central central hexagonal...Da~c~ Ca 1000.00 10.00 ·' 00.00 (Fe2 OJ /Ti02) <II C . .. 10.00 - ~DO ell 0 o D 100.00 1000...from East Australia and Pailin, PaiIin, using Fe, Ii Ti concentrations, concentrations, however, is is |  | | Journal (issue) | | measure about 12.5 cm (5 inches) across; the tallest crystal is about 17.5 cm (7 inches) high. Courtesy of Pala...Janse's "A History of Diamond Sources in Africa: Part II." (Part I of Mr. Janse's article won third place...exploration, he has worked on projects in Australia, Brazil, Canada, India, and South Africa. He has a B.Sc...refraction), in rock density (gravity), in the thermal state of the Earth (heat flow), and in rock magnetism...resolution Gravity desnity Responds to vartiations in rock based on variations in desnity Mapping subsurface |  | | Book | | information b Book review c Crystal morphology information d Crystal drawing ff Continues on following...65-136 65-128 1-96 GOLD-II] 1-112 MMEE•] 25 I 1994 1-80 ARIZONA-I] ARIZONA-II] [ 129-200 201-272...177-256 185-280 169-248 [ 425-528 337--400 COLORADO-II] 321--400 337--400 ARIZONA-Ill] 337--400 257-336...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 |  | | Journal (issue) | | 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 |  | | Journal (issue) | | New Zealand to describe an ornamental greenish rock containing variable amounts of ruby and sapphire...of rubies does not coincide with the New Zealand rock, but at present the allusion remains elusive and...Bastos, F.M., 1969. Euclase from Minas Gerais, Brazil. Journal afGemmology, XI(8), 312-14 4. Hurlbut...tourmaline, kunzite, quartz varieties (e.g. rock crystal, amethyst, citrine, agate), feldspars (e.g....earlier or later high-grade metamorphic event in this rock unit, we conclude that this was also the time of |  | | Book (edition) | | recognition as objects of beauty and merit, and colorful crystal In the this Field clusters are now regarded as...some lawyers and insurance agents among the world's rock hounds who could develop some sort of insurance...responsible for the major part of the work on the crystal drawings,- to Eunice Robinson Miles, now a legend...Minerals and Where to Find Geographical Distribution Rock Classifications Igneous Rocks Them Sedimentary...Textures and Outlines of Aggregates 4 Crystal Classifications The Crystal Systems Other Forms and Phenomena |  | | Journal (issue) | | OCTOBER 1991 Cover Picture Cross section of ruby crystal with massive rutile inclusion. (Plate 5, 'The growth...phenomena. Were it not for fine, parallel acicular crystal inclusions in chrysoberyl, there would be no cat's-eye...reading taken on the apex of of the cap with a Duplex II refractometer refractometer revealed a value of of... the stone could have been a large tourmaline crystal, possibly red in colour and from Burma where in...Swedish like English. "Purple-coloured Mountain Crystal." Robals: rauwa, rawa; granater. "Small transparent |  | | Book | | and isomorphism The classification of minerals Crystal structure Properties of crystals Gem crystals ...imitation stones Crystal growth from solution Growth by flame-fusion Hydrothermal growth Crystal pulling Flux-melt...corundum precipitates out in star-like rays when the crystal is heated to approximately 1500°C (the melting...arbitrarily assigned as 12. birefringence a crystal with more than one refractive index is said to...there. defect an internal irregularity in a crystal. dendritic having a plant-like form. dislocations |  | | 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...80 Emerald and 140 Beryls, as Founda- Part II 86 87 Birthstones, Beryl in India, CHEMICAL AND...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 |  | | Book (edition) | | Sedimentary rocks Igneous rocks Met (ie BR hic rock atie Places) Plutonic rocks Digitized by the...PETERSON co1ranf (CR ® Oonds61 Od “= Sc ene Se aoe ii Saas) Vos SAQLVv Gc he iV} ese S 06 (eer irae...responsible for the major part of the work on the crystal drawings. Eunice Robinson Miles assisted with...Preface to the Fourth Edition About This Book IPAIRIE II An Introduction to the Study of Rocks and Minerals...and Where to Find Them Geographical Distribution Rock Classifications The Igneous Rocks Extrusive Igneous |  | | Journal (issue) | | Chrysocolla chalcedony from Spain|Rhodochrosite from Brazil|Tourmaline mining in the DRC|Colour-zoned Cr- and...Collins, King’s College London; John L. Emmett, Crystal Chemistry, Brush Prairie, Washington, USA; Emmanuel...Gemmological Association of Great Britain ISSN: 1355-4565 ii Cert no. TT-COC-002454 Understanding Gems ™ The...will ‘pass’ and require no further examination (type II stones are referred for further testing). It has...gemmologists that appeared in 2014 include tourmaline from Brazil, Tanzania and Nepal; gem-quality wurtzite and colour-change |  | | Book | | ucj1u« of Anmic.i. Ali, Gi,~ucl. Philipp< Gill«. Gene,ii,V, Gimud-Buulini,r. Eric Gon,hier. Michel Crtgoi«...d'hi~roi re n.1mrdle, Pari~. working on sampl~ of rock from the ulrra-deep ccrresmal manrle. C..arrier...Ac lefr, a mould of llle original rough diamond crystal. The heavily etched surface was che result of dissolution...l \r· c t't & H,,,i 1h 1,1) . Ont p rou v~ lllh:' Ii: I' .,11'91:lnL (c t'..:1 n 11t i•.11 1l' t~ u +...ell pre .J n.< .J 1.1 fli, p , kc c~~ · n H.•;,.•ii ,!~ i.:C'~ .\ ld!i,• .r . q ~IL" 11!'1 .1 11f'-••1U |
|
