 | Giuliani, Gaston, Fallick, Anthony E., Feneyrol, Julien, Ohnenstetter, Daniel, Pardieu, Vincent, Saul, Mark (2011) 18O/16O and V/Cr ratios in gem tsavorites from the Neoproterozoic Mozambique metamorphic belt: a clue towards their origins?. Mineralium Deposita, 46 (7) 671-676 doi:10.1007/s00126-011-0355-6 | Journal (article/letter/editorial) | | from northern and southern Tanzania, Kenya, and Madagascar. Three consistent sets of ÎŽ18O values between...Neoproterozic metasedimentary series. The ÎŽ18O value of tsavorite is a good tracer of the environment of its formation;...formation; the ÎŽ18O of the fluid in equilibrium with tsavorite was buffered by the host rock during metamorphism...step in characterizing the geochemistry of gem tsavorite from most of the deposits and occurrences worldwide...worldwide. Keywords Mozambique Metamorphic Belt . Tsavorite . Oxygen isotopes . V/Cr ratio . Mn . Geographic |  | Feneyrol, Julien, Giuliani, Gaston, Ohnenstetter, Daniel, Rondeau, Benjamin, Fritsch, Emmanuel, Fallick, Anthony E., Ichang'i, Daniel, Omito, Edward, Rakotondrazafy, Michel, Ranatsenho, Madison, Lallier, Florent (2014) New typology and origin of tsavorite based on trace-element chemistry. European Journal of Mineralogy, 26 (2) 293-308 doi:10.1127/0935-1221/2014/0026-2367 | Journal (article/letter/editorial) | | Fast Track Article New typology and origin of tsavorite based on trace-element chemistry oo f JULIEN...UniversiteÌ dâAntananarivo, Antananarivo 101, Madagascar rre ct Abstract: New electron-microprobe analyses...the ultravioletâvisibleânear infrared. Type 1 tsavorite spectra show a total absorption below 430 nm due...Type 2 tsavorite spectra present the classical absorption bands of V. Types 3 and 4 tsavorite spectra... whereas spectra of Cr-bearing types 4 and 5 tsavorite show the two additional bands of Cr3ĂŸ at 697 and |  | | Journal (article/letter/editorial) | | Washington, DC 20013 pohwatp@si.edu GROSSULAR Jeffrey Mine, Asbestos, Les Sources MunicipalitĂ© RĂ©gional de...Figure 1. Grossular, 7 Ă 8 cm, from the Jeffrey mine, Asbestos, Les Sources MunicipalitĂ©, RĂ©gional de...grossular dodecahedra is commonly observed on Jeffrey mine specimens. This particular specimen is one of the...modified single crystal of grossular from the Jeffrey mine, Asbestos, QuĂ©bec, Canada. The Arkenstone specimen...12-cm-high group of grossular crystals from the Jeffrey mine, QuĂ©bec, Canada. Formerly in the Charles Key collection |  | | Journal (article/letter/editorial) | | brucec@uj.ac.za TSAVORITE The Green Gem Variety of Grossular Merelani Hills, Manyara District, Tanzania ...hibschite, hydrogrossular (Transvaal jade), and tsavorite, the emerald-green grossular. Variably colored...colored grossular specimens from the Jeffrey mine in Canada have previously been featured as a Connoisseurâs...depth and intensity of color to be considered tsavorite?â The answer is not straightforward but depends...superseded by the accepted name tsavorite (Bridges 1974). The term tsavorite is used here where the appropriate |  | | Journal (article/letter/editorial) | | GREEN GIANT VANADIUMGRAPHITE DEPOSIT, SOUTHWEST MADAGASCAR VERONICA E. DI CECCO§ AND KIMBERLY T. TAIT...oxide minerals have been previously identified in graphite-bearing quartzo-feldspathic gneisses derived from...from the Green Giant vanadium-graphite property in southwest Madagascar. The vanadium-rich oxides include...identified together in the Sludyanka, Lake Baikal area. Green Giant is the second occurrence worldwide...from the Lake Baikal area. Keywords: vanadium, vanadium oxides, Madagascar, graphite, oxyvanite, Green |  | Giuliani, Gaston, Dubessy, Jean, Ohnenstetter, Daniel, Banks, David, Branquet, Yannick, Feneyrol, Julien, Fallick, Anthony E., Martelat, Jean-Emmanuel (2018) The role of evaporites in the formation of gems during metamorphism of carbonate platforms: a review. Mineralium Deposita, 53 (1) 1-20 doi:10.1007/s00126-017-0738-4 | Journal (article/letter/editorial) | | interactions, or sulphurous fluids (ruby, garnet tsavorite, zoisite tanzanite and lapis-lazuli) or molten...i.e. tsavorite, and vanadium-rich zoisite, called tanzanite, from Tanzania, Kenya and Madagascar, and...Afghan emeralds, Asian ruby-bearing marbles, tsavorite and tanzanite in East Africa (Groat 2014) and...(Fig. 2b). The brecciated rock unit in the Chivor area, which is in excess of 10 km long and 10 m thick...Minh Tien mine, Luc Yen mining district, Vietnam, 2 Ă 1 cm. e Nodule, rough and cut of tsavorite from the |  | | Book | | chromian diopside crystals on large, well-formed grey graphite crystals, field of view 3 cm - Philip Hitge specimen...particularly Orogenic Belt - which runs from Madagascar through Tanzania, Kenya, Ethiopia and into the...father, Campbell Bridges, was the discoverer of tsavorite in both countries, and the first person to bring...the national gemstones of Kenya and Tanzania (tsavorite and tanzanite, respectively) occur within a 160-kilometre...commercial quantities only in East Africa. While tsavorite and tanzanite are the most renowned gemstones |  | Feneyrol, J., Ohnenstetter, D., Giuliani, G., Fallick, A. E., Rollion-Bard, C., Robert, J.-L., Malisa, E. P. (2012) EVIDENCE OF EVAPORITES IN THE GENESIS OF THE VANADIAN GROSSULAR 'TSAVORITE' DEPOSIT IN NAMALULU, TANZANIA. The Canadian Mineralogist, 50 (3) 745-769 doi:10.3749/canmin.50.3.745 | Journal (article/letter/editorial) | | EVAPORITES IN THE GENESIS OF THE VANADIAN GROSSULAR âTSAVORITEâ DEPOSIT IN NAMALULU, TANZANIA Julien FENEYROL...Dar-es-Salaam, Tanzania Abstract The Namalulu tsavorite (vanadian grossular up to 0.80 wt.% V2O3) deposit...V2O3), V-bearing rutile (up to 1.9 wt.% V2O3), and graphite. This rock is affected by calcic metasomatism...precipitating calcite and mobilizing the elements for tsavorite crystallization in quartz-calcite veins. The dolomitic...(lens I) and a calcite-scapolite-diopside-sulfides-graphite lens (lens II). This last unit is characterized |  | Jacob, J.-B., Martelat, J.-E., Goncalves, P., Giuliani, G., Devidal, J.-L., Feneyrol, J., Omito, E., Ichang'I, D. (2018) New P-T-X conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) Lithos, 320. 250-264 doi:10.1016/j.lithos.2018.09.010 | Journal (article/letter/editorial) | | conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) J.-B. Jacob...conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya). Lithos (2018)...conditions for the formation of gem tsavorite garnet in the Voi area (southwestern Kenya) J-B. Jacoba,*...(J-E. Martelat ) ACCEPTED MANUSCRIPT Abstract Tsavorite nodules-bearing deposits from southwestern Kenya...Ma. The T main goal of this work is to link tsavorite formation to the metamorphic evolution of the |  | | Thesis/Dissertation | | ............. 22 2.5.3.1.2.5. Antetezambato, Madagascar ............................................................................. 25 2.5.4.1. Tsavorite ............................................................................ 27 2.5.4.1.1.3. Madagascar ............................................................................. 28 2.5.4.1.2. Tsavorite geochemistry ....................................................... 40 2.5.9.1.1.2. Bekily, Madagascar ............................................ |  | | Book | | 200 known here-holds the productive Mwadui diamond mine, known for Yeryfine, rare, pink diamonds. Emerald...lusciously nch greener-than-emerald tsavorite. Unique geochemistry in the area holds out the possi~ility of...garnet, a 28.41-carat tanzanite, a 9. 73-carat tsavorite garnet, and a 22.69-carat chrome tourmaline. Courtesy...Africa 73 Rh.odolite of the Lindi District, Tanzania 76 Tsavorite Garnets 76 The Pyrope-Spessartine-Almandine...Tanzania 96 Red Dravite Tourmaline from the Narok District, Kenya 99 Uvite-Dravite Chrome Tourmaline 99 |  | | Journal (article/letter/editorial) | | deposits in Myanmar (Burma), Sri Lanka, Tanzania and Madagascar. The gravels in each deposit include gem-forming...muscovite, across a stream from a gem tourmaline mine, Minas Gerais, Brazil. Photo: J. Saul. (Figure...gems are commonly exceedingly friable: the best âtsavoriteâ (a trade name for V- and Cr-green grossular;...grossular; Feneyrol et al. 2010) from the Scorpion Mine (Mgama Ridge, southeast Kenya) could be mined with a teaspoon...communications) and the best rubies at the John Saul Ruby Mine in Tsavo West National Park, Kenya, came from what |  | | Catalog/List | | locality, Earth makes her own crystals; or the mine where a mineral was discovered, is akin to its ...Start- Further west, on the island nation of Madagascar ing in the east African nation of Tanzania,...DrĂąa-Tafilalet Region of Morocco, tsavorite. Traveling west to the storied Tsumeb Mine is one of the very finest...Dioptase Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia 13 cm tall x 14 cm wide Africa The mine we now call...Africa 11 Tsavorite Garnet Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region |  | | Journal (issue) | | Geologyofofthe theYellow Yellow Mine Mine (Taita-Taveta (Taita-TavetaDistrict, District,Kenya) Kenya) and andother...Yellow YellowMine Minein inthetheMangare Mangarearea area(southern (southernKenya) Kenya)is isdescribed. described...pegmatite fromthethe John also JohnSaul SaulMine Mine(southern (southernKenya) Kenya)is is alsogiven....Mg - Ca Mg series). uvite (Na Mg - Ca Mg series). area areastretching stretchingfrom fromthetheTaita TaitaHills...JohnSaul Saul coming where is isanan Ruby Mine, in in thethe Mangare Area of ofsouthern comingusually usuallyfrom |  | | Journal (issue) | | Tanzania|Rainbow moonstone from Malawi|News from the Oceanview mine, Pala, California|Scheelite from Inner Mongolia|Aging...Atichat 230 The Discoverer of TsavoriteâCampbell Bridgesâand His Scorpion Mine By Bruce Bridges and Jim Walker...Montepuez Area (Mozambique)â can be accessed at www.gia.edu/gia-rubies-from-montepuez-area, and âBlue...in the inclusion scene. The haze across the dark area is created by the out-of-focus series of negative...the road leading to the Spitzkoppe beryl and topaz area in west-central Namibia. At first glance the material |  | | Journal (article/letter/editorial) | | gem-quality tanzanite, to date, is the Merelani area of northeastern Tanzania, a structurally complex...green grossular garnets, known as tsavorite, are also found in the area, as well as a variety of other rare...values of tanzanite, tremolite, tsavorite and kyanite from the Merelani area are all high (average of 19...derived fluids. The whole-rock ÎŽ18O values of graphite-bearing gneisses that host the tanzanite range...0â°). Graphite-free garnet-bearing gneisses from the Telele Hills, ~33 km south of the mining area, have |  | Giuliani, G., Ohnenstetter, D., Palhol, F., Feneyrol, J., Boutroy, E., De Boissezon, H., Lhomme, T. (2008) KARELIANITE AND VANADIAN PHLOGOPITE FROM THE MERELANI HILLS GEM ZOISITE DEPOSITS, TANZANIA. The Canadian Mineralogist, 46 (5) 1183-1194 doi:10.3749/canmin.46.5.1183 | Journal (article/letter/editorial) | | gem-bearing assemblage consists of quartz, sulfides, graphite and âtanzaniteâ occurring in hydrothermal veins...V-bearing pyrrhotite lenses, which are cross-cut by graphiteââtanzaniteâ-bearing quartz veins. Karelianite...mineralization is a black shale; the hydrothermal graphite has a d13C equal to â24.0â°, which indicates a...est formĂ©e par des veines de quartz Ă sulfures, graphite et âtanzaniteâ qui recoupent les gneiss graphiteux...vanadifĂšre, et recoupĂ©es par des veines Ă quartzâgraphite et âtanzaniteâ. La karĂ©lianite, avec une composition |  | | Journal (article/letter/editorial) | | significance of the 867 cmâ 1 out-of-plane Raman mode in graphite associated with V-bearing green grossular Rainer...producer of green vanadium grossular gemstones (tsavorite). Samples from one of the mines near Mwatate,...remarkable new insights into the genesis of tsavorite. Graphite is intimately associated with V-grossular...found five different types of graphite. Surprisingly, in one graphite type the âRaman-forbiddenâ and...quality tsavorite crystals, since we propose that the anomalous spectroscopic behavior of the graphite is |  | Giuliani, Gaston, Fallick, Anthony E., Boyce, Adrian J., Pardieu, Vincent, Pham, Van Long (2017) Pink and Red Spinels In Marble: Trace Elements, Oxygen Isotopes, and Sources. The Canadian Mineralogist, 55 (4) 743-761 doi:10.3749/canmin.1700009 | Journal (article/letter/editorial) | | 1. (A) General view of the spinel mine of Cong Troi, Luc Yen area, Vietnam. (B) Spinel (Sp) associated...Luc Yen, Vietnam. (D) Pale spinel from the Luc Yen area, Vietnam. (E) Spinel (Spl) in forsterite (forsterite...phlogopite (Phl) and mackinawite (Mk) from the Kuh-i-Lal mine, Tajikistan. Sample ENSMP n830851 Ecole des Mines...spinels (Pardieu & Hughes 2008). The historical mine of Kuh-i-Lal, exploited since the 7th century and...all the cited countries and also at Ilakaka in Madagascar and Sri Lanka. Up until now, the mineralogical |  | | Journal (article/letter/editorial) | | Zoisite BRUCE CAIRNCROSS Merelani Hills, Simanjiro District Manyara Region, Tanzania Department of Geology...artisanal workings at Merelani Hills. Some small mine headframes are visible in the middle of the scene...diamonds. The most famous diamond mine in East Africa, the Williamson mine, exploits the Mwadui kimberlite...bubble-gum-pink diamonds, and records show that in 1954 the mine produced 105 carats of bright pink diamonds per...almandine, grossular varieties hessonite and tsavorite, rhodolite, pyrope, and spessartine), corundum |  | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | | magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding to xenocrysts...rubies from the recently discovered Didy mine in Madagascar also command high prices [19]. A set of eight...Ambohimandrosoa, Antsirabe area, cm2.1 Ă 1.3 andcm 1.7Ăcm 1 cm Ă 11.7cm) Antsirabe area, Madagascar. Collection: Madagascar...Madagascar. Collection: L. Thomas; Photo: Louis-Dominique Bayle © le RĂšgne MinĂ©ral; (C) rubies L. Thomas;...MinĂ©ral; (C) rubies from the Montepuez mine, from the Montepuez mine, Mozambique. Vincent Pardieu © Gemmological |  | | Journal (issue) | | paragraph on page 249, that it should be the Helam mine near Swartsruggens, and Sierra Leone is better described...ct crystal collected in situ from the wall of a mine at Muzo, Colombia, by GIAâs Bill Boyajian. We also...with Baker cedarwood oil (in red); note that this area of the spectrum also contains small emerald features...spectral information only comes from the near-surface area, other filler substances deeper in the stone would...Umba locality, the geologically similar Kalalani area hosts deposits of gem-quality sapphire (reddish |  | Jaszczak, John A., Trinchillo, Daniel (2013) Miracle at Merelani A Remarkable Occurrence of Graphite, Diopside, and Associated Minerals from the Karo Mine, Block D, Merelani Hills, Arusha Region, Tanzania. Rocks & Minerals, 88 (2) 154-165 doi:10.1080/00357529.2013.763671 | Journal (article/letter/editorial) | | Remarkable Occurrence of Graphite, Diopside, and Associated Minerals from the Karo Mine, Block D, Merelani...crystals of the mint-green grossular known as tsavorite and lustrous green prismatic crystals of diopside...crystals of graphite, perhaps the finest in the world, was discovered at Merelaniâs Karo mine in December...and beauty, the graphite crystals are covered by a secondary overgrowth of graphite that contains rare...rare stellate graphite dendrites. Figure 1. The Karo mine area in Block D of the Merelani mining complex |  | | Report (issue) | | pocket in the McEarl Ridge mine near Jessieville, also called the James Zigras mine, because that worthy collector...Quartz, 14.7 cm, from the Zigras (McEarl Ridge) mine, Jessieville, Arkansas. The Arkenstone specimen...attributed to a mine named, aptly enough, the Green Fluorite mine, Manaoshan Mountain, Suxian district, Chenzhou...6 cm, from the Green Fluorite mine, Manaoshan Mountain, Suxian district, Chenzhou Prefecture, Hunan, China...handler, to a discovery in summer 2015 in the âDongpo mine,â Chenzhou, Hunan: see the photo on page 84 of the |  | | Journal (issue) | | moving products from mine to consumer. The main cover image was taken at the AnahĂ mine in Bolivia, a major...courtesy of Rio Tinto; (4) an 11.16 ct sapphire from Madagascar, GIA Collection no. 31618; (5) a 1.01 ct yellow...competitive rough diamond market. Political problems in Madagascar and a ban on gem exports from Myanmar disrupted...2. Small-scale artisanal miners, such as this tsavorite miner near Voi, in Kenya, are estimated to supply...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS |
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