 | | Journal (article/letter/editorial) | | Article 2 Near infrared signature of opal and chalcedony as a proxy for their structure and formation...MANGOLD 1 4 Abstract: Opal-A, opal-CT and chalcedony develop in various geological environments mainly...spectroscopic criteria distinguish opal-A, opal-CT and chalcedony: the apparent maximum of the absorption at 5200...28 29 30 31 32 33 34 35 36 37 38 39 Opals and chalcedony are different types of opaline silica found in...with fluid circulation, usually water. Opals and chalcedony, as hydrated minerals, record this involvement |  | | Book | | until he managed to reach the land of his dreams, Brazil. A specialist in the field of geology and mineralogy...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...UNIQUE MINERALS IN WORLD MUSEUMS GEM TREASURES OF BRAZIL SOFIA–MOSCOW 2004 3 Cyan Magenta Yellow Black...MINERAL TREASURES OF BRAZIL 76 85 AN OUTLINE OF THE MINERAL RESOURCES OF BRAZIL ORIGIN OF GIANT CRYSTALS |  | | Report (issue) | | turned to other projects. The outbreak of World War II delayed the publication of the Leakey's scientific...the beads are accurately described as agate, chalcedony, white and green quartz, steatite, and several...bear no resemblance to the Australian fields-and Brazil is producing opal that seems to be somewhat harder...after the days of Pliny the Elder-when Emperor Rudolf II issued a mining license for the deposit. The region's...thiefly actions." Prior to the reign of Emperor Joseph II, anyone could pursue mining activity by paying a |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...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...Landmann. CDD-549 Indexes for systematic catalog: 1. Brazil: Minerals and precious stones: Mineralogy and gemology |  | | 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 |  | | 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,...Gemmological Association of Great Britain ISSN: 1355-4565 ii Cert no. TT-COC-002454 Understanding Gems ™ The...Synthetic Diamond Screener II Released in September 2017, the Synthetic Diamond Screener II from Presidium uses |  | Ramos, Gilsijane V., de Castro, David L., Bezerra, Francisco H.R., Ferreira, Joaquim Mendes, do Nascimento, Aderson F., de Oliveira, Paulo H.S., Nogueira, Francisco C.C. (2021) Seismicity in the equatorial margin of Brazil reactivates the Precambrian basement fabric. Journal of South American Earth Sciences, 106. 103084pp. doi:10.1016/j.jsames.2020.103084 | Journal (article/letter/editorial) | | com/locate/jsames Seismicity in the equatorial margin of Brazil reactivates the Precambrian basement fabric Gilsijane...Federal do Rio Grande do Norte, 59078–970, Natal, RN, Brazil Instituto Nacional de Ciência e Tecnologia em...em Estudos Tectônicos – INCT-ET, CNPq, Brazil Instituto Nacional de Ciência e Tecnologia em Geofísica...Geofísica do Petróleo – INCT-GP, CNPq, Brazil d Escola de Ciências e Tecnologia, Universidade Federal do Rio...Rio Grande do Norte, 59078-970, Natal, RN, Brazil e Departamento de Engenharia de Petróleo – Universidade |  | | Journal (article/letter/editorial) | | classical gem opal localities: Australia, Mexico, or Brazil. In addition, some preliminary results on isotopic...crystallized at high temperature. Marcasite, chalcedony and all opal varieties formed at lower temperature...Slovakia Slovakia Pedro II, Piaui, Brazil Pedro II, Piaui, Brazil Pedro II, Piaui, Brazil Pedro II, Piaui, Brazil...typical gem opal localities of Mexico, Australia and Brazil are studied for comparison with Slovakian opals...Lightning Ridge, Australia (OP 246), and Piaui, Brazil (OP251). Note that the spectrum from Lightning |  | | Book | | Treasure chambers of Augustus II Surface lustre St George statuette Chalcedony Frederick the Great’s snuffbox...Andes Emerald Topkapi emerald dagger Beryl Dom Pedro Aquamarine Modern carving and engraving Danburite...iron and manganese oxide sometimes penetrate chalcedony to form dendritic agate. Acicular crystal form...resemble bunches of grapes in shape. Hematite, chalcedony, and malachite are minerals that are found in...QUARTZ AMETHYST CHRYSOBERYL APATITE RUBY CHALCEDONY AGATE AMBER LAZURITE COPAL Optical variations |  | | Journal (issue) | | illnesses begin. Sard is a brownish form of chalcedony, but Epiphanius's stone sounds more like cornelian...unless Epiphanius is referring to another type of chalcedony which is grey or greyish-blue, fibrous to crypto-crystalline...aluminium fluosilicate. Natural red stones from Brazil have been found occasionally and it is possible... Prasinus refers to prase, a dark leek-green chalcedony or, possibly, to quartz coloured by actinolite..."wine-faced", was supposed to be similar. There is a chalcedony quite like it which is found in the same place |  | | Book | | Treasure chambers of Augustus II Surface luster St. George statuette Chalcedony Frederick the Great’s snuffbox...Andes Emerald Topkapi emerald dagger Beryl Dom Pedro Aquamarine Modern carving and engraving Danburite...iron and manganese oxide sometimes penetrate chalcedony to form dendritic agate. Acicular crystal form...resemble bunches of grapes in shape. Hematite, chalcedony, and malachite are minerals that are found in...QUARTZ AMETHYST CHRYSOBERYL APATITE RUBY CHALCEDONY AGATE AMBER LAZURITE COPAL Optical variations |  | | Journal (issue) | | Manganese? S.W. S.W. I L.W. " " " « « «s I :: II :: Inert ABSP. ABSP. " Hint M;\I MN Hint MN...Inert Dull Yellow" Bright Yellow Bright Apricot D~iI Yello~' Deep Brown/Red n'~ep Br~wn/Red Bright...1·7415 1'742 1'746 1'750 1'740 1'7405 ___I £ 5 --II. Colour Colourless Colourless Pale Yellow £ ^...TJ ^ ^ c3 J2 5 v SH S g .a .a | KffiK* II II II *' < Z 10 J. Gemm, 1976, XV, 1 specific gravity...know he means " I s it a sherry-colour topaz from Brazil?" Again, if a customer, speaking of his diamond |  | | Journal (issue) | | in Russia each weighing approximately 1 ct. Table II. The spectrum of the ordinary ray (o) is characterized...! 500 700 800 1 600 Wavelength (ran) Table II: UV/VIS absorption maxima and assignments Absorption...alkali ions and the weaker band is caused by type-II water molecules which are bound to alkali ions. ...the XXI International Gemmological Conference, Brazil 1987 Dillon, S., 1981. Gem news: synthetic red...inclusions in Nacken synthetic emeralds 495481 In ~ I ii ~ ~~ B B 49 6 B b B c I I I I I I |  | | Book | | designated a “strategic material” during World War II, not just for its excellence in bomb making, but...percent of this in Colombia, followed by Zambia, then Brazil, Pakistan, Zimbabwe; much smaller amounts are found...Zimbabwe, and the Santa Terezinha de Goiás mine in Brazil, the same places that produce the more highly included...and six-rayed star emeralds have been found in Brazil, and more recently, in the case of the cat’s eye...Mozambique, Russia, and Nigeria, in addition to Brazil. These emeralds may also have a small amount of |  | | 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...Smith gave valuable information on the new chrome chalcedony found in Rhodesia. The staff of both western...ft) thick at Urubu, near Araçuai, Minas Gerais, Brazil. Fine pink and green gem-quality tourmaline has...acid members of the volcanic province in southern Brazil and Uruguay, and the fire opals occurring in small...amethyst from volcanic rocks in Rio Grande do Sul, Brazil. The amethyst crystals are more strongly coloured |  | | Journal (issue) | | 472 Gem Notes Chrysocolla chalcedony from Spain|Rhodochrosite from Brazil|Tourmaline mining in the DRC|Colour-zoned...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...volcanic and chemical jaspers, ‘thunder eggs’, chalcedony, banded agate, lace agate and natural glasses...gemmologists that appeared in 2014 include tourmaline from Brazil, Tanzania and Nepal; gem-quality wurtzite and colour-change |  | | Journal (issue) | | Well-formed crystals also occur in Peru, Bolivia, Chile, Brazil, Japan and Mexico. 'Sand dollars' are particularly...refers to a carved head of iron pyrites with chalcedony eyes in the United States National Museum, Washington...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...J.F., 1962. The art of the gunmaker. Volume I and II. Barrie and Rockliff, London 19. Caire, A., 1833 |  | | Journal (volume) | | Paul Cooper, program B. The Bromeliaceae of Brazil. 290 pp., 128 figs. (Publ. 4184.) L. The archeological...^utilications! in JBotanp THE BROMELIACEAE OF BRAZIL By LYMAN B. Department of Botany, U. With S...years of study in the United States, Europe, and Brazil. Much of the paper has been derived from an unpublished...has been limited to that strictly essential in Brazil and descriptions have been eliminated in favor...FIGURES Map Fig. : Distribution of Bromeliaceae in Brazil 7 I. Puya 2. Encholirium bradeanum Encholirium |  | | Journal (article/letter/editorial) | | com/loi/tigr20 Geology and Mineral Resources of Brazil: A Review a a Inacio De Medeiros Delgado , Augusto...Pesquisa de Recursos Minerals, Scdvador, Bahia, Brazil b US. Geological Survey, Denver, CO, 80225 Version...Thorman (1994): Geology and Mineral Resources of Brazil: A Review, International Geology Review, 36:6,...rights reserved. Geology and Mineral Resources of Brazil: A Review INACIO DE MEDEIROS DELGADO, AUGUSTO J...Pesquisa de Recursos Minerals, Scdvador, Bahia, Brazil AND CHARLES H. THORMAN US. Geological Survey, Denver |  | | Journal (issue) | | MARKETS Figure 9. Near Nova Era in Minas Gerais, Brazil, the Belmont mine operates using sophisticated...other mines in the area slowed (Weldon, 2006). Brazil witnessed a sustained slump in overall gemstone...in places like the United Arab Emirates, Russia, Brazil, India, and China—locations that would not have...discovered in Paraíba and Rio Grande do Norte states in Brazil in 1989 (Fritsch et al., 1990) and became known...plummeted, mining operations in key centers such as Brazil and Zambia curtailed or ceased production, though |  | | 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 (article/letter/editorial) | | OF THE GEOLOGY, MINERALOGY, AND PALEONTOLOGY OF BRAZIL* BY JO H N C. BRANNER ( Presented by title before...No comprehensive bibliography of the geology of Brazil has hitherto been attempted. M. de Margerie, in...pretense of being a bibliography of the geology of Brazil. In 1881 the Bibliotheca Nacional, at Rio de Janeiro...important Catalogo da Exposigao da Historia do Brazil in two large volumes. One of these volumes contains...Bibliotheca Nacional that relate to the geology of Brazil, and included in this are many titles of works |  | | Journal (issue) | | D. M. (1960). The geochemistry of Scapolite. Part II, Trace elements, Petrology, and General Geochemistry...Selsk. Skrifter, Naturvidensk. Math. Afd. 9 Raekke, II, 2, p.233-325. Crowningshield, R. 1977. Gems & Gemology...M. and Yonge, C. M. (ed.) Physiology of Mollusca II, Academic Press, New York, pp.249-250. Gregoire,...transparent blue, green and blue-green dumortierite from Brazil.) Id., 205-6, bibl., 1979. (a) Describes transparent...cut, blue, green and blue-green dumortierite from Brazil. Dumortierite is usually translucent (not transparent) |  | | Journal (issue) | | Bortolan quarry, Poços de Caldas, Minas Gerais, Brazil . . . . . . . . . . . . . . . . . . . . . . . ...line with the beginning of the entry, is the word “Brazil.” As a clincher, the entry for Lot 2265 is exactly...been given to the 6th Duke by Emperor Dom Pedro I of Brazil in 1831, though there is no original documentary...unknown. Why Dom Pedro disposed of it remains an equal mystery. He had become Emperor of Brazil in 1822 after...Uruguay, he abdicated, made his 5year-old son Dom Pedro II Emperor in his place, and returned to Europe, |  | | Journal (issue) | | reading taken on the apex of of the cap with a Duplex II refractometer refractometer revealed a value of of...1991, 22, 8 the epoxy and not of the underlying chalcedony. In the authors' experience, this reading is...Electrically Gems& & Gemology, 22, 4, 246. Treated Chalcedony. Gems Nassau, K., 1983. Gemstone Enhancement...2 translated and vols. John John Murray, London. II, p.254-6. [Manuscript received 14 March March 199...presented in the first part (Kiefert & Schmetzer, 1991a). II. Natural sapphires from alkaline rocks In connection |
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