 | | Journal (issue) | | Pearl Testing 36 Emeralds from South America – Brazil and Colombia 48 Clinohumite – The Mountain Fire...rise of new economies such as China, India, and Brazil. The challenges have been numerous as these new...every ICA member, I would like to thank the IBGM in Brazil along with every company, individual, and government...Opening a Tsavorite Mine T anzaniteOne Limited is working towards opening a tsavorite mine not far from its...Tanzania, about 20 kilometers from its tanzanite mine. The project has a total indicated resource of 1 |  | | 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,...turquoise vein near the village of Casa Nova, in Bahia, later flooded by the waters of the Sobradinho dam |  | | Journal (article/letter/editorial) | | ©Springer-Verlag 1990 Origin of emerald deposits of Brazil G. Giuliani 1. 2 , L. J. H. D. Silva 3 and P. Couto...Couto 4 1 2 3 4 ORSTOM, Universidade de Brasilia, Brazil c.R.P.G., 15 Rue N.D. des Pauvres, BP 20, 54501...Metais Ltda, Bahia, Brazil Secretaria das Minas e Energia, C.P.R.M./SGM, Bahia, Brazil Abstract. Precambrian...Precambrian emerald deposits of Brazil are found in a typical geologic setting with Archean basement and...Emerald mineralization belongs to the classic biotite-schist deposit, which formed by the reaction of |  | | Journal (article/letter/editorial) | | emerald mines in Colombia are becoming depleted. Brazil currently accounts for approximately 10% of world...samples from the Lened occurrence in Canada, the Muzo mine in Colombia, the Mohmand district in Pakistan, and...export values of emerald rough (Zwaan et al., 2005). Brazil currently accounts for approximately 10% of world...characterized by the development of albite, muscovite, biotite, tourmaline, and pyrite. Fluid inclusions in the...to 0.02% were of gem-quality. 89 Since then the mine has been re-opened and closed several times (Walton |  | Ribeiro-Althoff, A. M., Cheilletz, A., Giuliani, G., Féraud, G., Camacho, G. Barbosa, Zimmermann, J. L. (1997) 40Ar/39Ar and K-Ar Geochronological Evidence for Two Periods (∼2 Ga and 650 to 500 Ma) of Emerald Formation in Brazil. International Geology Review, 39 (10) 924-937 doi:10.1080/00206819709465310 | Journal (article/letter/editorial) | | (∼2 Ga and 650 to 500 Ma) of Emerald Formation in Brazil a a a b A. M. Ribeiro-Althoff , A. Cheilletz...(∼2 Ga and 650 to 500 Ma) of Emerald Formation in Brazil, International Geology Review, 39:10, 924-937 To...ages have been obtained on the emerald deposits of Brazil. These include: Socotó (2104 ± 41 Ma), Carnaíba...consistent with two periods of emerald formation in Brazil—~2 Ga and between 650 and 500 Ma. The age of the...Nivel Superior (CAPES), C. P. 1055, Brasilia DF, Brazil. 3 Also affiliated with Ecole Nationale Superieure |  | | Report (issue) | | trapiche emerald Rupert Hochleitner Brazil: Minas Gerais, Bahia, Ceara, Goias and Tocantins . . . . ...Asia: Pakistan, Afghanistan and India .......6 0 Old Mine Emeralds . . . . . . . . . . . . . . . . . . . ...Maharajahs and Maharanis held large emeralds (see "Old Mine Emeralds" page 62). The Color of Islam Emerald...quality. It was the gift of Emperor Dom Pedro I of Brazil to the 6 th Duke of Devon- shire. Also housed...some of the most productive emerald localities in Brazil, for example, more than 77 percent of the emerald |  | | Journal (issue) | | Heinrich, E.W. (1946) Studies in the mica group; the biotite-phlogopite series. Am. J. Sci., 244, 836-48. [Manuscript..., 1983, XVIII, 6 FIG. 4. Sorting apparatus at mine location. (Photo by Laura J. Ramsey) The colour-distribution...produced some years ago by heating Brazil's Montezuma Mine stones. (We proposed the name 'peridine' for this...Africa, Cobra Mine, Transvaal South Africa, Cobra Mine, Transvaal South Africa, Cobra Mine, Transvaal South...Africa, Cobra Mine, Transvaal South Africa, Cobra Mine, Transvaal South Africa, Cobra Mine, Transvaal South |  | | Book | | 184 Argentina 184 Australia 185 Austria 187 179 Brazil 189 Colombia 195 India 197 Malagasy Republic Mexico...=Aquamarine; Brazil, India, Malagasy Republic, Namibia, USA, USSR. Bixbite; USA (rare) Emerald; Brazil, Colombia...Malagasy Republic, Brazil, USA (rare) Heliodor; Brazil, Malagasy Republic, Namibia Maxixe; Brazil (rare) Morganite;...Morganite; Brazil, Malagasy Republic, Namibia, USA Xill —_ = 7 - Pease iS ean, 2a al + =a? 860)...was one of the first to make a serious attempt to mine the Habachtal emerald deposit. It is reported that |  | | Book | | Antarctica 184 Argentina 184 Australia 185 Austria 187 Brazil 189 Colombia 195 India 197 Malagasy Republic 198...Aquamarine; Brazil, India, Malagasy Republic, Namibia, USA, USSR. Bixbite; USA (rare) Emerald; Brazil, Colombia...Malagasy Republic, Brazil, USA (rare) Heliodor; Brazil, Malagasy Republic, Namibia Maxixe; Brazil (rare) Morganite;...Morganite; Brazil, Malagasy Republic, Namibia, USA xiii Chapter 1 Emerald and beryl in antiquity Although...as one of the first to make a serious attempt to mine the Habachtal emerald deposit. It is reported that |  | | Journal (issue) | | the International Gemmological Conference held in Brazil in September/October 1987, the author was given...cavities on the basal pinacoid of an aquamarine from Brazil. The c-axis is perpendicular to the image. Nomarski...Madagascar, sample (d) from Sta, Terezinba de Goias, Brazil, and sample (e) from Miku, Zambia, representing...vanadiumbearing, chromium-free green beryl is known (Salininha, Bahia, Brazil), and some samples of a similar type were...Sandawana, Zimbabwe; Lake Manyara, Tanzania; Itabira, Brazil or Ural Mountains, USSR, reveal the presence of |  | | Journal (issue) | | feldspar, biotite and pyrope-rich garnet. The granulite complex contains as fine stripes garnet-biotite gneisses...gneisses, garnet-cordierite gneisses, biotite-plagioclase gneisses, quartzite and hypersthene gneisses....these gems, in the rough, at the sources—whether in Brazil or Colombia, Africa or Sri Lanka, Australia or...enough to take part in them. Go to the source. Visit Brazil, Africa. Palpate with your own hands the bare facts...synthetic opal is being offered as natural opal at mine sites. Mr Ball subsequently received a sand-coated |  | | Journal (issue) | | Near Kianjavato, in the so-called Ankadilalana mine, blue-green emeralds of faceting quality are found...originating from the Morafeno region, near Mananjary. The mine extends over an area of about one square kilometre...with those for emeralds coming from occurrences in Brazil, Australia, Norway and of some African African...for the Brazilian emeralds from Pirenopolis/GO, Salininha/BA, and I taberailGO and also those for the African...concentrations of 5 analysed samples from Cobra Mine/Transvaal (Fillmann, 1987) c = mean concentrations |  | | Journal (issue) | | Near Kianjavato, in the so-called Ankadilalana mine, blue-green emeralds of faceting quality are found...originating from the Morafeno region, near Mananjary. The mine extends over an area of about one square kilometre...with those for emeralds coming from occurrences in Brazil, Australia, Norway and of some African African...for the Brazilian emeralds from Pirenopolis/GO, Salininha/BA, and I taberailGO and also those for the African...concentrations of 5 analysed samples from Cobra Mine/Transvaal (Fillmann, 1987) c = mean concentrations |  | | Journal (issue) | | 'unroofed' and superficially eroded intrusions of biotite-granite. Although cassiterite is not a gemstone...can invariably be correlated here with Younger biotite-Granites and the richest tin mineralization is...and quartz stringers in the roof zones of the biotite-granite intrusions, and has been retained within...relatively relatively little little quartz, quartz, biotite biotite and and partly muscovite. Lepidolite Lepidolite...1989. Beryl gem nodules from the Bananal Mine, Minas Gerais, Brazil. Gems and Gemology, Gemology, 25,25-9 |  | | Journal (issue) | | agesofofemeralds emeraldsfrom from Precambrian Shields (Brazil, and the of the taking of small samples from aa...activation analysis EMERALDS FROM PRECAMBRIAN ROCKS (Brazil, (NAA), for Madagascar, Zambia) have significantly...7 30.1 0.45 1.59 1.55 0.038 n.d. n.d. Origin Brazil em. 1* em.2* Santa Terezinha em. 1 em.2 sch em...calcite, and those from Santa Terezinha (Goias State, Brazil) are in equilibrium with their hostrock. Rubidium...to Table I results (Socoto, Bahia State; Itaberai, Goias State - Brazil). Acknowledgements The authors |  | | Journal (issue) | | in 1917 the deep blue beryls from the Maxixe mine in Brazil have been a source of fascination both for...oriented younger metasedimentary belts composed of biotite schists and amphibolites. The pegmatites occur...are three main granite types: hornblende biotite granite; biotite granite and alkali granite with Na-Fe...metasomatism are only well documented for the biotite granites. Each hydrothermal process is characterized...addition to quartz and microcline, contain both biotite and muscovite and in many cases considerable amounts |  | | Journal (issue) | | 1-594. T h e owner said they were from a new mine in Brazil but would not vouchsafe its actual location... D R A P E R (T.). A new source of emeralds in Brazil. Gems and Gemology, 1963/4, X I , 4, pp. 111-113...Fazenda Sao Thiago, near Salininha, Municipality of Pilao Arcado, in the State of Bahia. I n 1950 he tried...was not until 1962 that any attempt was made to mine the stones. T h e locality may be the one Coutinho...finding and exploitation. Other sources of emerald in Brazil are also mentioned. R.W. OSTWALD ( J.). On the |  | | 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...NATIONAL MUSEUM IN SOFIA 66 OTHER COLLECTIONS OF MINE IN BULGARIA 71 COLLECTIONS IN OTHER CITIES AROUND |  | | Journal (issue) | | compound; figure 2 shows the view of Swat Valley from Mine 1. GEOLOGY The emerald-bearing rocks overlie a dark...the Swal Valley from one of the dumps of emerald mine no. 1. The mountains in the background are the eastern...a problem at the mines; the present system uses mine-carts that are loaded manually. If production is...(Sandawana) (Mingora) Oxide la Ob 3c 4= Brazil (Salininha) 5c SiO, 62.23 63.84 65.0 A1203 15.41 18...samples Australia Poona Brazil Bahia Anag6 Brumado Carnaiba Salininha, Pilao Arcado Minas Gerais Unspecified |  | | Journal (issue) | | 20 ct round brilliant-cut, both from the Argyle mine in western Australia. They represent typical examples...these three round brilliant-cuts from the Panna mine in India ranging from 0.30 to 0.33 ct, are also...series of three white diamonds is from the Panna mine, India (Figure 3). This sampling includes 31 stones...known to come from the Argyle mine in north-west Australia. This mine became fully operational only in...hydrogen-rich diamonds have been reported from the Jwaneng mine in Botswana, where commercial recovery of diamonds |  | | Journal (issue) | | Brazilian emeralds and their occurrences: Carnaiba, Bahia Dr Dietmar Schwarz* and Thomas Eidt, Dipl.Geol...Federal University of Ouro Preto, Minas Gerais, Brazil **University of Mainz, FRG 1. Introduction The...occurrences of Carnaiba and Socoto in the state of Bahia are located at a distance of about 40 kilometres...centre for the gemstones mined in the state of Bahia (besides emerald, others include amethyst, citrine...been the most important emerald mining region in Brazil until the discovery of the Santa Terezinha occurrence |  | | Journal (issue) | | large rubellite crystals were found in the pegmatite mine at Sakangyi. Furthermore, Bauer (Spencer transi...Angled growth structure in natural amethyst from Brazil; planes parallel to the positive rhombohedra r...in natural citrine (heattreated amethyst) from Brazil; adjacent planes parallel to the positive rhombohedron...the c-axis. 40x. Polysynthetic twinning of the Brazil law, which is also a characteristic feature of...in natural citrine (heattreated amethyst) from Brazil; opposite planes parallel to the positive rhombohedron |  | | Journal (issue) | | been reported as coming from South Africa and from Brazil. No exact locations are given. T h e colour is...coloured by chromium and natural green beryls from Salininha, which were claimed to be emeralds but contained...have emanated mainly from certain localities in Brazil. Some analytical data on them have been published...published by Wood and Nassau (11) . T h e stones from Salininha, which they call Chrome-Free Emeralds, all contain...0*001%. An analysis of a chromefree emerald from Bahia is similar. From a scientific point of view it would |  | | Report (issue) | | crystal weighed 455 kilograms. 2m: The Queen Anne mine in Zimbabwe has produced crystals up to 2 meters...some pegmatites. This specimen, from Minas Gerais, Brazil, is housed in the Deutsches Edelstein Museum in...crystals are found in soils and stream gravels in Brazil. On the other hand, at high temperatures and pressures...associated with quartz, microcline, albite, muscovite, biotite, ferrocolumbite, and phosphates (such as triphylite)...surprise. In 1997, Gary and Mary Freeman began to mine the Orchard pit, a then insignificant pegmatite |  | | 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 |
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