 | | Journal (article/letter/editorial) | | Gem Variety of Zoisite Merelani Hills, Simanjiro District Manyara Region, Tanzania T anzanite is one of...geological environment in one small geographic region on one continent: Africa. Added to this uniqueness...restricted occurrence, tanzanite from the Merelani Hills in Tanzania is the mineral featured in this Connoisseur’s...used for various colored zoisite crystals from Tanzania other than blue-purple-violet, and this should...minor graphite, 10 cm, Merelani Hills, Lelatema Mountains, Simanjiro district, Manyara region, Tanzania |  | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...chromian diopside crystals on large, well-formed grey graphite crystals, field of view 3 cm - Philip Hitge specimen...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to |  | | Journal (article/letter/editorial) | | ineral N ames Merelaniite Merelani (Mererani) Manyara Region Tanzania JOHN A. JASZCZAK Department...of merelaniite (0.73 mm long) associated with graphite and possible tremolite. Not shown are also associated...village of Merelani “in honor of the local miners, past and present, living and working in the region” (Jaszczak...from the tanzanite mines in Tanzania, eastern Africa. Merelaniite from Tanzania was actually first noted...chabazite, tremolite, diopside, quartz, calcite, graphite, alabandite, and wurtzite. Similar but incompletely |  | | Journal (article/letter/editorial) | | Zoisite BRUCE CAIRNCROSS Merelani Hills, Simanjiro District Manyara Region, Tanzania Department of Geology...South Africa brucec@uj.ac.za Figure 1. Map of Tanzania, prepared by William Besse. Tanzanite is mined...desirable is undoubtedly the variety tanzanite, from Tanzania (fig. 1). Mindat.org lists more than one thousand...Figure 3. General view of artisanal workings at Merelani Hills. Some small mine headframes are visible in...zoisite (not tanzanite) from Tanzania was not from the now-famous Merelani Hills deposit (fig. 3), but from |  | | Journal (article/letter/editorial) | | the Stannite Group from the Gem Mines near Merelani, Tanzania Luca Bindi 1 1 2 * and John A. Jaszczak...gem mines near Merelani, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania. Associated minerals...minerals also include graphite, diopside, and Ge,Ga-rich wurtzite. It is brittle, dark gray in color...stannite group; gallium; sulfide; Merelani tanzanite deposit; Tanzania Minerals 2020, 10, 467; doi:10...the region, the gem mines near Merelani, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania |  | | Journal (article/letter/editorial) | | Green Gem Variety of Grossular Merelani Hills, Manyara District, Tanzania G rossular, Ca3Al2(SiO4)3,...for this column (fig. 1) are from the Merelani Hills, Tanzania. From the standpoint of this article,...formation. They concluded that the metamorphism in the region occurred from 620 to 580 ma, coincidental with... back center specimen 2.6 cm, Merelani Hills, Manyara region, Tanzania. Patrick Meyer specimens, Jeff...of tsavorite is the Lemshuku mining district, northeast Tanzania (Bridges 1974). However, tsavorite was |  | | Book | | gemological wealth of East Africa. This unique region encompasses ·what may be the world's richest gem...gemologist and geologist, Dr. Peter Keller. Kenya and Tanzania are revealed in their full mineralogical splendor...chrome tourmaline are widely identified with the region. ( continuedon backflap) ♦ ♦ ♦ ♦ ♦ ~...Conclusion 11 Chapter 2. Diamond Deposits of Tanzania 15 Location 16 Geology 18 Mining 20 Properties...Northern Province, Tanzania 28 Ruby and Sapphire from Umba, Tanga Province, Tanzania 32 Sapphire from Kenya |  | | Report (issue) | | X-ray Powder Pattern: Merelani Hills, Lelatema Mountains, Manyara Region, Tanzania. 2.965 (100), 5.94 (60)...56 25.77 . 99.99 (1) Merelani Hills, Lelatema Mountains, Manyara Region, Tanzania; average of 13 electron...associated with masses of loosely aggregated graphite crystals. In a region of granulite-facies metamorphism of...calcite, graphite, alabandite, wurtzite. Distribution: From the tanzanite gem mines, Merelani Hills, near...near Arusha, Lelatema Mountains, Manyara Region, Tanzania. Name: Honors the local miners, past and present |  | | Journal (article/letter/editorial) | | characteristics of inclusions (calcite, anatase, graphite etc.) between natural and heat-treated tanzanite...weakened in the heat-treated T7 sample. The black graphite inclusions are often scattered or have a dotted...Raman peak of graphite, thus representing the order and structural incompleteness of graphite. In addition...called tanzanite. Until now, the Merelani area in northeastern Tanzania is the only producer of gem-quality...Antarctica to East Africa, and enters the Arabian–Nubian region, which was formed by a series of tectonic and metamorphic |  | | Journal (article/letter/editorial) | | ” 5.6 cm tall, Alchori, Shigar Valley, Skardu district, GilgitBaltistan, Pakistan. Private collection...syenite pegmatites in the Imilchil area, High Altas Mountains, Morocco (Jahn et al. 2003); the Alpine clefts...Rural City, Victoria Aberfoyle mine, Rossarden district, Tasmania Complex metamorphosed sedimentary exhalative...Paraíba: e.g., Sapo mine, Ferruginha; Golconda district, Governador Valadares; Linópolis, Divino das...Sebastopol Township Rapid Creek, Dawson mining district, Yukon Territory Sceptre claims, Emerald Lake |  | Jaszczak, John, Rumsey, Michael, Bindi, Luca, Hackney, Stephen, Wise, Michael, Stanley, Chris, Spratt, John (2016) Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania. Minerals, 6 (4) 115 doi:10.3390/min6040115 | Journal (article/letter/editorial) | | Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania John A. Jaszczak...gem mines near Merelani, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania. It occurs sporadically...chabazite, tremolite, diopside, quartz, calcite, graphite, alabandite, and wurtzite. In reflected polarized...cylindrite group; molybdenum; lead; Merelani tanzanite deposit; Tanzania Minerals 2016, 6, 115; doi:10.3390/min6040115...of 19 1. Introduction Merelaniite, from Merelani, Tanzania, was first identified unknowingly in 2012 |  | | Catalog/List | | Minerals 5 AT L A S Mibladen, MOR Manyara, TZ Merelani Hills Tsumeb, NA Anjanbonoina, MG This catalog...Madagascar ing in the east African nation of Tanzania, which we find the uncommon form of tourmaline...rarer gem species And north, in the Drâa-Tafilalet Region of Morocco, tsavorite. Traveling west to the storied... Calcite on Dioptase Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia 13 cm tall x 14 cm wide Africa The mine... Drâa-Tafilalet Region, Morocco 12.7 cm tall x 14 cm wide The Drâa-Tafilalet Region of Morocco, best |  | 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) | | VANADIAN PHLOGOPITE FROM THE MERELANI HILLS GEM ZOISITE DEPOSITS, TANZANIA Gaston GIULIANI§ IRD (Institut...Abstract The Merelani deposits of gem-quality vanadian zoisite (“tanzanite”) in Tanzania occur in Proterozoic...gem-bearing assemblage consists of quartz, sulfides, graphite and “tanzanite” occurring in hydrothermal veins...V-bearing pyrrhotite lenses, which are cross-cut by graphite–“tanzanite”-bearing quartz veins. Karelianite...mineralization is a black shale; the hydrothermal graphite has a d13C equal to –24.0‰, which indicates a |  | 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) | | 23 August 2013 Miracle AT Merelani A Remarkable Occurrence of Graphite, Diopside, and Associated Minerals...Block D, Merelani Hills Arusha Region, Tanzania T he gem mines of the Merelani Hills, Arusha Region, Tanzania...mining methods at TanzaniteOne Mining Ltd. (Arusha, Tanzania) expand in Block C, and as more primitive mining...com A pocket of exceptionally fine crystals of graphite, perhaps the finest in the world, was discovered...and beauty, the graphite crystals are covered by a secondary overgrowth of graphite that contains rare |  | | Journal (article/letter/editorial) | | DC 20013 pohwatp@si.edu Diopside MERELANI, ARUSHA REGION, TANZANIA Most silicates . . . are drab and...Diopside associated with graphite, 6 cm high, from Merelani Hills, Arusha Region, Tanzania. Steve Smale specimen...cut of diopside from the Kunlan Mountains, Xinjiang Autonomous Region, China. The rays of light are an...Baicheng, Kunlun Mountains, Akesu Prefecture, 168 ROCKS & MINERALS Xinjiang Autonomous Region. These are...deposit, Baise Prefecture, Guangxi Zhuang Autonomous Region, in small, dark crystals, associated with vesuvianite |  | 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) | | main productive areas from northern and southern Tanzania, Kenya, and Madagascar. Three consistent sets...Saul Swala Gem Traders, Sokoine Road, Arusha, Tanzania deposits hosted in graphitic gneisses related...discovered by Bridges in 1967, in northeastern Tanzania, is among the most successful recent gemstones...significant tsavorite deposits are found in Kenya, Tanzania, and Madagascar. The geology of the deposits has...partly in the Voi region in Kenya (Pohl and Niedermayr 1978) and Merelani mines in Tanzania (Malisa 1987; |  | | Journal (article/letter/editorial) | | and zoisite (variety tanzanite). Spectacular graphite crystals form the matrix to specimens of many...oCCuRRENCE oF GRAphitE AND ASSoCiAtED miNERAlS, KARo pit, BloCK D, mERElANi hillS, tANzANiA. J. M. Long1...Biochemistry, miami university oxford, oh 45056. The Merelani Hills deposit is best known as the exclusive locality...discovered in the Karo pit, Block D, of the Merelani Hills that contained the following mineral assemblage:...assemblage: axinite-(Mg), chabazite, diopside, graphite (three generations), fluorapatite, gypsum, laumontite |  | | Report (issue) | | Green Fluorite mine, Manaoshan Mountain, Suxian district, Chenzhou Prefecture, Hunan Province. And I will...Green Fluorite mine, Manaoshan Mountain, Suxian district, Chenzhou Prefecture, Hunan, China. The Arkenstone...material hails from somewhere in the Merelani Hills, Manyara, Tanzania, and only two of the nine specimens...variety tsavorite, 3 cm, from the Merelani Hills, Manyara, Tanzania. Marin Mineral Company specimen and...tsavorite) and pyrite, 2.5 cm, from the Merelani Hills, Manyara, Tanzania. Marin Mineral Company specimen and |  | Pring, Allan, Wade, Benjamin, McFadden, Aoife, Lenehan, Claire E., Cook, Nigel J. (2020) Coupled Substitutions of Minor and Trace Elements in Co-Existing Sphalerite and Wurtzite. Minerals, 10 (2) 147 doi:10.3390/min10020147 | Journal (article/letter/editorial) | | sphalerite component, while the sample from Merelani Hills, Tanzania, is Mn-rich with mean Mn levels in wurztite-4H...within the two coexisting polytypes. In the Merelani Hills sample the Cu+ + Ga3+ = 2Zn2+ substitution...of Cu and Ga to above 2000 ppm in the sphalerite region. The 2Ag+ + Sn4+ = 3Zn2+ coupled substitution does...sphalerite; trace element substitution; Animas; Merelani Hills 1. Introduction Sphalerite, the cubic close...from the Animas-Chocaya Mine complex, Quechisla district, Bolivia (SAM G33739; henceforth denoted “Animas”) |  | 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) | | VANADIAN GROSSULAR ‘TSAVORITE’ DEPOSIT IN NAMALULU, TANZANIA Julien FENEYROL and Daniel OHNENSTETTER§ Université...Dar-es-Salaam, P.O. Box 35052, Dar-es-Salaam, Tanzania Abstract The Namalulu tsavorite (vanadian grossular...up to 0.80 wt.% V2O3) deposit in northeastern Tanzania occurs in metasomatized graphitic gneiss overlain...V2O3), V-bearing rutile (up to 1.9 wt.% V2O3), and graphite. This rock is affected by calcic metasomatism...(lens I) and a calcite-scapolite-diopside-sulfides-graphite lens (lens II). This last unit is characterized |  | | Journal (article/letter/editorial) | | AND ASSOCIATED GEMSTONE MINERALIZATION AT MERELANI, TANZANIA C. HARRIS Department of Geological Sciences...to date, is the Merelani area of northeastern Tanzania, a structurally complex region consisting of granulite...tanzanite, tremolite, tsavorite and kyanite from the Merelani area are all high (average of 19.1, 19.5, 18.5...derived fluids. The whole-rock δ18O values of graphite-bearing gneisses that host the tanzanite range...values (24.0 and 25.0‰). Graphite-free garnet-bearing gneisses from the Telele Hills, ~33 km south of the |  | | Journal (issue) | | You, Donors FEATURE ARTICLE 80 Gem Wealth of Tanzania Dona M. Dirlam, Elise B. Misiorowski, Rosemary...ABOUT THE COVER: Over the last three decades, Tanzania-the subject of the lead article in this issue-has...of gem-quaLity diamonds, rubies, and sapphires, Tanzania is perhaps best known for its production of the...of zoisite, tanzunite, which occurs in the Merelani Hills. The superb transparent tanzanite crystal shown...nation of Tanzania has great gem wealth. First known by Westerners for its diamonds, Tanzania emerged in |  | | Journal (article/letter/editorial) | | the specimen probably originated in the Wah Wah Mountains, which are close to Milford. Zoned dodecahedral...cm on edge have been found in the Santa Rosa Mountains, Riverside County. Grossular found near Bishop...Kimitoön, Western Finland Province, Finland Proper region, Finland, where lusterless dodecahedra of the iron-rich...edge have been found at Žulová, Jesenik district, Olomouc region, Czech Republic. Similar specimens have...have come from Černá Voda, Jesenik district, Olomouc region. Brown grossular to 1 cm on edge, in a massive |  | | Journal (article/letter/editorial) | | a new mineral from the Tintic District, Utah, and the Masonic District, California, USA. Canadian Mineralogist...mines: Carisa, Boss Tweed, or Red Rose), Tintic district, Juab Co., Utah, U.S.A. It was later also discovered...the town of Bodie in the Bodie Hills volcanic field, Masonic district, Mono Co., California, U.S.A. The...for its type locality. The mines of the Tintic district exploited polymetallic (Au-Ag-Cu-Pb) vein deposits...3 groups). All spectra were featureless in the region from 4000 to 1200 indicating no evidence of OH– |  | 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) | | geographic provenance of economic tsavorite from Kenya, Tanzania and Madagascar. Key-words: tsavorite, green grossular...mined in placers from Sri Lanka, Madagascar and Tanzania (Giuliani et al., 2012). In other cases, such...northeastern Tanzania (Bridges, 1974). The economic deposits are located in Kenya, Tanzania and Madagascar...described tsavorite in nodules from the Sør Rondane mountains in Antarctica. The vanadium contents of garnet...Feneyrol, 2012), northeastern and southeastern Tanzania (Bridges, 1974; Malisa, 1987; Malisa & Muhongo |
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Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania