 | | Journal (issue) | | Award Alice S. Keller FEAW ARTICLES The Anahi Ametrine Mine, Bolivia Paulo M. Vasconcelos, Hans-Rudolf...Rossman The Indaia Sapphire Deposits of Minas Gerais, Brazil David S. Epstein, Warren Brennan, and Tulio...4-23 Q 7994 GemokgicalInstitute ofAmerica Anahi Ametrine Mine 0 ne of the most interesting gem materials...r i i ~ ebicolored , amethyst, bolivianite, or ametrine* (figure 1).Although this material was well received...the 1970s, the natural or artificial origin of ametrine has been the subject of much controversy over |  | de Miranda Pinto, Luiz Carlos B., Righi, Ariete, Lameiras, Fernando Soares, da Silva Araujo, Fernando Gabriel, Krambrock, Klaus (2011) Origin of the color in cobalt-doped quartz. Physics and Chemistry of Minerals, 38 (8) 623-629 doi:10.1007/s00269-011-0434-3 | Journal (article/letter/editorial) | | autoclaves at the Technological Center of Minas Gerais (CETEC), Brazil. The quartz samples, originally yellow...B. de Miranda Pinto Technological Center of Minas Gerais (CETEC) and REDEMAT, Av. José Cândido da Silveira...Silveira, 2000, Belo Horizonte 31170-000, Brazil A. Righi · K. Krambrock (&) Departamento de Física, Universidade...Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil e-mail: klaus@fisica.ufmg.br F...Development Center (CDTN) and REDEMAT, Belo Horizonte, Brazil F. G. da Silva Araujo Department of Physics and |  | | Book | | across 81 Twinned Chrysoberyl 82 Espirito Santo, Brazil 8 cm (3'/a 1n ) across Spine) on Rock Matrix...across Brazilian ite Conselheira Pena, Minas Gera1s, Brazil 10 cm (4 in.) across 117 118 Fluorap11ti... 119 120 Fluorapatite Lavra da llha, Minas Gerais, Brazil 4 cm (1 Yi in.) across Pyrornorphite Bunker...long Hydroxylherderite Virgem da Lapa, Minas Gerais, Brazil 10 cm (4 in ) across 125 Hydroxylherderite...Largest Topaz Crystal Fazenda do Fun1I, Minas GeraJS, Brazil 154 271 kg (596 lb.) Topaz with Quartz |  | | Journal (article/letter/editorial) | | years and is the source of some of the finest ametrine, unusually large African quartz crystals, and...giant quartz crystals, and gold in Minas Gerais, Brazil; amethyst, ametrine, phosphophyllite, and cassiterite |  | | Journal (issue) | | to the drawing to the right, are: (1) 41.62 ct ametrine, (2) 7.71 ct green jadeite, (3) 7.81 ct violet...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...the early ’90s, particularly from Goiás and Minas Gerais (primarily the Nova Era area). By the middle |  | | Journal (article/letter/editorial) | | years and is the source of some of the finest ametrine, unusually large African quartz crystals, and...giant quartz crystals, and gold in Minas Gerais, Brazil; amethyst, ametrine, phosphophyllite, and cassiterite |  | | Journal (issue) | | geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production...pg. 106 102 G&G Micro-World Optical dishes in ametrine • Astrophyllite in bastnäsite • Flashes and flames... Svisero, James E. Shigley, and Robert Weldon Brazil, which commanded global production in the 1700s...principally in the states of Minas Gerais and Mato Grosso, are presented. W hile Brazil is widely known for...Tijuco (later named Diamantina) in the state of Minas Gerais (Calógeras, 1904; Leonardos, 1959; Barbosa, |  | | Journal (issue) | | County, Virginia, Virginia, Minas Minas Gerais, Gerais, Brazil, Brazil, Madagascar, Madagascar, Sri...1.802(3) Taita Hills, Kenya 2 1.795-1.809 Minas Gerais, Brazil3 1.803-1.805 4 Composition Garnets...Brazil:chemical chemicalcharacter characterand and Brazil: thermal behaviour behaviour thermal 1 1 2 2 3...Ouro Preto, MG, Brazil Universidade Federal dede Ouro Preto, 35400, Ouro Preto, MG, Brazil ABSTRACT: Imperial...town Ouro Preto, Minas Gerais, Brazil. town of of Ouro Preto, Minas Gerais, Brazil. Thetwo twomost mostimportant |  | | Journal (article/letter/editorial) | | through the crystal as with the quartz (variety ametrine) in figure 6. One exceptional case where the full...Kiikuni photo. Figure 6 (above). Quartz, variety ametrine, Anahi mine, Bolivia. The upper image is a complete...surface of apatite from the Golconda mine, Minas Gerais, Brazil. Right: A reflected light image (differential |  | | Journal (issue) | | Gemstone Knowledge Hub 468 Gem Notes Amethyst from Brazil|Beryllonite from Pakistan|Apache Blue Stone from...Tanzania|Alluvial diamond mining in South Africa| Quartz from Brazil with hematite/goethite, pyrite and rhodochrosite...microscopically distinguishing natural from synthetic ametrine is described on pp. 506–529 of this issue. Shown...Articles 506 Distinction of Natural and Synthetic Ametrine by Microscopic Examination—A Practical Approach...gem-producing nations, including Afghanistan, Australia, Brazil, Madagascar, Nigeria, Sri Lanka and Tanzania. Visit |  | | Journal (issue) | | ARTICLES 260 An Update on “Paraíba” Tourmaline from Brazil James E. Shigley, Brian C. Cook, Brendan M. Laurs...Afghanistan • Update on amethyst, citrine, and ametrine from the Anahí mine, Bolivia • “Copal” resin from...corundum from Wyoming • Green kyanite from Bahia, Brazil • “Ruby Rock” cabochons • Tourmaline from Warner...More recently, Brendan has visited Madagascar and Brazil to obtain first-hand knowledge of important gem...of gemological topics: “Paraíba” tourmaline from Brazil, spessartine garnet from California, Malaya garnet |  | | Journal (issue) | | from Brazil shows chatoyancy caused by flat hollow channels. Four-rayed star aquamarine from Brazil has...the c-axis. A tourmaline-quartz combination from Brazil has an iridescent chatoyancy Grey orthoclase moonstone...cat's-eye from Brazil A very unusual example of a cat's-eye was purchased in Brazil by the author in...measuring Figure 1: Chatoyant pale blue topaz from Brazil weighing 152.15 ct. Photo by J. Hyrsl. 32.94 x...described two topaz cat'seyes, one blue of 7.98 ct from Brazil and another colourless of 12.20 ct from Sri Lanka |  | | Journal (issue) | | ........................................... 13 Brazil .................................................Lapidary, Hong Kong; CMP Asia, Hong Kong; GEA, Brazil; Emmanuel Piat, France; Israel Emerald Cutters...DIRECTORS Andrew Cody, Australia Sergio Martins, Brazil Emmanuel Piat, France Constantin Wild, Germany...to improve the color. Some kunzite buyers from Brazil also discovered that rough crystals they purchased... CY CMY K 2006 MINING REPORT C ompared to Brazil, its land-locked neighbor, Bolivia is a small country—it |  | | Report (issue) | | influence on the world amethyst market emerged in Brazil (see page 66), where the discovery of rich deposits...foreigners (non Portuguese) doing business in Brazil influenced the availability, and therefore the...362-carat cushion-cut gem from the Jacobea Mine, Bahia, Brazil, that is housed in the Smithsonian. Another, a...that resulted from the influx of material from Brazil. When it was made it cost £2,000 (about $10,000);...sedimentary fluids short prismatic Ametista do Sul, Brazil Artigas, Uruguay Cavities in sedimentary rocks |  | | Book (edition) | | trigonal Agate Achroite Amethyst Amethyst Quartz Ametrine Ankerite Aventurine Bloodstone Blue Quartz Brucite...Clinohumite Clinozoisite Humite Hureaulite Amber Ametrine Analcime Anatase Ancerite Andalusite Andesine...star made of golden-yellow rutile needles; Minas Gerais/Brazil. 58 Natural emerald with oil residues...south and southeast Asia, the Urals, Australia, Brazil, and the mountainous zones of the United States...have been limited advances in ore processing. In Brazil at some places hydraulic mining is used for the |  | | Journal (issue) | | Santa Maria mine, Brazil; (2) 20.10-ct peridot, Burma; (3) 21.09-ct kunzite, Brazil; (4) 8.14-ct grossular... California; (6) 15.18-ct tourmaline, Paraiba, Brazil; (7) 10.42-ct tanzanite, Tanzania; (8) 6.09-ct...38-ct ruby, Burma; (17) 3.08ct tourmaline, Paraiba, Brazil; (18) 1.85-ct fancy purple-pink diamond, Argyle...number of new localities. Fine alexandrites from Brazil, sapphires from Southeast Asia and Australia, emeralds...pegmatite gemstones (tourmaline, aquamarine, etc.) from Brazil, Pakistan, Afghanistan, and several countries in |  | | Journal (issue) | | VOL. 49 NO. 12 • DECEMBER 2019 40 SPODUMENE 10 AMETRINE Bi-Colored Quartz Brilliance A Colorful Lithium...offers. Non-transferrable. RG12/19 FREE ADMISS Ametrine with amethyst and citrine quartz, also referred...quantities of ametrine has been mined in Bolivia. GETTYIMAGES 10 ROCKNGEM.COM AMETRINE BI-COLORED QUARTZ...BRILLIANCE Story by Bob Jones W hen the first ametrine crystals reached America from Bolivia, a vigorous...Today both arguments are correct. The original ametrine crystals are natural and come from quartz veins |  | | Catalog/List | | Compared to the output of place such as Afghanistan or Brazil, the production from Elba is relatively small....semi-precious gem market has become enamored with Ametrine - the combination of Amethyst and Citrine in the...59 BRAZIL 73060 TOPAZ var. IMPERIAL TOPAZ Ouro Preto, Iron Quadrangle, Minas Gerais, Brazil This specimen...var. ROSE QUARTZ Galiléia, Doce Valley, Minas Gerais, Brazil Here is a cockscomb arrangement of Rose...Itatiaia mine, Conselheiro Pena, Doce Valley, Minas Gerais, Brazil This rather sizable, pale blue-green Aquamarine |  | | Book (edition) | | trigonal Agate Achroite Amethyst Amethyst Quartz Ametrine Ankerite Aventurine Bloodstone Blue Quartz Brucite...Coral Cordierite Corundum Creedite Howlite Amber Ametrine Analcime Anatase Andalusite Andesine Andradite...star made of golden-yellow rutile needles; Minas Gerais/Brazil. 58 Natural emerald with oil residues...south and southeast Asia, the Urals, Australia, Brazil, and the mountainous zones of the United States...have been limited advances in ore processing. In Brazil at some places hydraulic mining is used for the |  | | Journal (issue) | | and Mineral Society, Inc. Fallbrook, California Ametrine from the Anahí Mine, Bolivia November Program...Lithosphere Lithosphere Information Cover Image - Ametrine from the Anahí Mine, Bolivia courtesy Caltech... G.G. presents From the Andes to the Amazon: Ametrine and the people who mine it, cut it, and love it...fascinating visit of the world's one and only source of Ametrine. Robert Weldon, G.G. is the Manager of Photographic...contacts for our forays into Rio Grande do Sul, Minas Gerais and Ceara. Sr. Estafano was discriminating in |  | | Book (edition) | | Prehnite. Multicoloured Gems yy Alexandrite ‘ Ametrine Bi Colour Fluorite ae Bi Colour Tanzanite ...Rubellite MEXICO NIGERIA e— TAHITI Tahitian Pearl BRAZIL Agate TANZANIA Amethyst AAA Tanzanian Ruby AAA...Chrysoberyl Citrine Emerald Fire Opal ZAMBIA BOLIVIA Ametrine i : AAA Emerald AAA Aquamarine Amethyst Aquamarine...Green Amethyst Rose de France Amethyst Ametrine Sunburst Ametrine Bi Colour Quartz Blueberry Quartz Blue...quality, which makes absolutely no sense to me. While Brazil, Burma, Madagascar, Mozambique, Sri Lanka, Tanzania |  | | Catalog/List | | open-work obelisk, supporting 64 amethyst and ametrine carved flowers, each set with 18K yellow gold stamens...further decorated with forty-four amethyst and ametrine flowers, is formed as a three-tiered arrangement...AGATE GEODE DEPICTING A CRANE ON ROOTWOOD BASE Brazil A geode slab measuring nearly 1 inch in thickness...ALBITE VAR. CLEAVELANDITE WITH MUSCOVITE MICA Minas Gerais, Brazil Cleavelandite was named in 1823 in honor... AND MINERALS | 33 2059 GREEN BERYL NECKLACE Brazil Comprising 25 polished beryl beads of both green |  | | Book | | Diopside 126 99 Dioptase 126 99 Fluorite 127 Ametrine 100 Hematite 127 Aventurine Ouartz 101 Iolite...turquoise, white topaz. Midpriced ($100-$200): Ametrine, blue sapphire, chrysoprase, danburite, fire...zoning, which refers to stones that the bicolored ametrine and the bicolored or tricolored watermelon tourmaline...in the delicate rain forests and other parts of Brazil and beyond, legislation. that country (like...most desired ones originate in Brazil, in the mining region of Minas Gerais. Other important sources include |  | | Journal (issue) | | points or druses. Bahia and Rio Grande do Sul, Brazil, are by far the most well known localities for...be the presence Amethyst with included goethite Brazil of minute amounts of aluminum along with natuDenise...citrine. Citrine localities include Brazil, Russia, and Madagascar. Ametrine is an unusual variety. It contains...well-documented locality is the Anahi mine, Bolivia. Ametrine has occurred at Amethyst Hill in the Central Hill...they are known in Newry, Maine, USA and Minas Gerais, Brazil. 9 THE BACKBENDER'S GAZETTE JUNE 2007 |  | | Book | | Darts 70 Andalusite 128 Jadeite Corundum Ametrine 128 Grossular Horn 84 Cordierite (lolite)...materials Quartz crystals from Corinto, Minas Gerais, Brazil. Height: 15 cm. Sorbonne collection using...crys- Washing diamond-bearing gravel in Minas Gerais, Brazil. Photo: tals of such minerals as quartz...phrase ‘‘gem quality’ to de- from Salinas, Minas Gerais, well as an ‘‘ornamental stone.’ Amethyst...and a jeweler might then speak of a ‘root’ as Brazil Length: 9 cm. K. Proctor collection, United States |
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