 | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...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...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | 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...graphite, 10 cm, Merelani Hills, Lelatema Mountains, Simanjiro district, Manyara region, Tanzania. Marcus Budil |  | | Journal (article/letter/editorial) | | ineral N ames Merelaniite Merelani (Mererani) Manyara Region Tanzania JOHN A. JASZCZAK Department...mm long) associated with graphite and possible tremolite. Not shown are also associated prehnite, chabazite...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...include zoisite, prehnite, stilbite, chabazite, tremolite, diopside, quartz, calcite, graphite, alabandite |  | | 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 |  | | 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...masses of loosely aggregated graphite crystals. In a region of granulite-facies metamorphism of organic-rich...(variety tanzanite), prehnite, stilbite, chabazite, tremolite, diopside, quartz, calcite, graphite, alabandite...tanzanite gem mines, Merelani Hills, near Arusha, Lelatema Mountains, Manyara Region, Tanzania. Name: Honors |  | 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...(variety tanzanite), prehnite, stilbite, chabazite, tremolite, diopside, quartz, calcite, graphite, alabandite...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 |  | | Journal (article/letter/editorial) | | 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...etc. Sometimes, other inclusions such as green tremolite, xenotime, rutile, and hematite can be found [13–15]...variety of Zoisite, Merelani Hills, Simanjiro District, Manyara Region, Tanzania. Rocks Miner. 2020,...Geology and Petrology of the Merelani-Tanzanite Deposit, Northeast Tanzania. Ph.D. Thesis, University of |  | 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) | | Technology] at 07:05 23 August 2013 Miracle AT Merelani A Remarkable Occurrence of Graphite, Diopside...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...produced gem-quality diopside, fluorapatite, and tremolite crystals. Adding to their uniqueness and beauty...Figure 1. The Karo mine area in Block D of the Merelani mining complex, with the TanzaniteOne (Block C) |  | | Journal (issue) | | (5) Chrysoberyl, 2.3 cm, from Takovaya, Ural Mountains, Russia. (6) Chalcocite, 2.5 cm, from Cornwall...Miask, Ural Mountains, Russia. (8) Pyrargyrite, 1.8 cm, from St. Andreasberg, Harz Mountains, Germany....Dyscrasite twin, 1.9 cm, from St. Andreasberg, Harz Mountains, Germany. (3) Glaucodot twin, 2.5 cm, from Håkansboda...Harz Mountains, Germany. (5) Elbaite, 2.5 cm, from Sarapulka, 12 km from Mursinka, Ural Mountains, Russia...Aquamarine beryl, 2.4 cm, from Slieve Corra, Mourne Mountains, County Down, Ireland. Gem-crystal thumbnails |  | | Journal (article/letter/editorial) | | DC 20013 pohwatp@si.edu Diopside MERELANI, ARUSHA REGION, TANZANIA Most silicates . . . are drab and...with graphite, 6 cm high, from Merelani Hills, Arusha Region, Tanzania. Steve Smale specimen, James Elliott...cut of diopside from the Kunlan Mountains, Xinjiang Autonomous Region, China. The rays of light are an...clinohumite, wollastonite, grossular, vesuvianite, tremolite, scapolitegroup minerals, calcite, and quartz...Baicheng, Kunlun Mountains, Akesu Prefecture, 168 ROCKS & MINERALS Xinjiang Autonomous Region. These are |  | | 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...and tremolite). The δ18O values of tanzanite, tremolite, tsavorite and kyanite from the Merelani area...Graphite-free garnet-bearing gneisses from the Telele Hills, ~33 km south of the mining area, have much lower...protolith. The average δD value of the tanzanite and tremolite is -77 and -27‰, respectively, which is consistent |  | 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...characterized by the presence of F-bearing minerals (tremolite, phlogopite, tainiolite, titanite), with up to...present in tainiolite, as well as in F-bearing tremolite. This is the first description of metamorphic |  | | Journal (article/letter/editorial) | | Rochester Mineralogical Symposium siderite, tremolite, and zoisite (variety tanzanite). Spectacular...ASSoCiAtED miNERAlS, KARo pit, BloCK D, mERElANi hillS, tANzANiA. J. M. Long1, J. F. Rakovan2, J. Jaszczak3...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:...localities: The Merelani tanzanite nines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record |  | | Journal (article/letter/editorial) | | wollastonite, scapolite, vesuvianite, diopside, and tremolite (Anthony et al. 1995). It is now time to “tour”...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 |  | | 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– |  | | Journal (article/letter/editorial) | | pargasite, diopside, and tremolite, there is a newly discovered site for tremolite as large, sharp, tran...specimen 40928. 164 ROCKS & MINERALS Figure 2. Tremolite and talc, 13 cm, O’Brien farm annex, North Russell...crystallized, white to tan, massive material hosting tremolite crystals. Bullock Prospect, southwest of Russell...the nearby French property is a new site for tremolite as unusual sharp green (2.9 weight percent FeO)...coarsely crystallized, tan, massive material hosting tremolite and dravite crystals. MORE THAN MEETS THE EYE: |  | | Journal (article/letter/editorial) | | silicate rock at the type locality Merelani Hills, south of Arusha, Tanzania (Jobbins et al. 1975); albite...Institute of Chemical Technology, Praha in the spectral region from 400 to 4000 cm –1 in a KBr tablet. Results...Bli ná (Novák – unpubl. data) and from Merelani Hills, Tanzania (Jobbins et al. 1975), respectively, but...Disregarding magnesioaxinite from the type locality Merelani Hills with Mg = 1.92, Fe = 0.00 and Mn = 0.07 apfu...localities to date. It is associated with: calcite, tremolite, titanite and quartz in albite – epidote hornfels |  | | Report (issue) | | wollastonite, scapolite, vesuvianite, diopside, tremolite, quartz. Distribution: Many localities, even for...Coahuila. Gems from the Merelani Hills, southeast of Arusha, Tanzania. In the Taita Hills, near Voi, Kenya. |  | | Journal (issue) | | of Aurora Gems; (6) a 9.15 ct ruby from Winza, Tanzania, courtesy of Hakimi & Sons; (7) a 14.80 ct “golden”...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS...Africa, and its interest in the Williamson mine of Tanzania. Soon after the Cullinan deal went though (July...Weldon, 2009). One new source of corundum, Winza in Tanzania, began yielding some fine-quality ruby in 2007...with the opening of a new mine in the Nova Era region and technological developments at established mines |  | | Journal (article/letter/editorial) | | anisotropy in band structures in the O-H vibrational region that clinopyroxene can exhibit (e.g., Johnson et...This study U.S.A. (dehydrated) CIT17210 Merelani Hills, Tanzania 3.273(5) 78(2) 71(11) 182(9) 331(14) 48(5)...250(30) 185(18) Boyd et al. (1984)§ JLM77 Merelani Hills, Tanzania 3.277(7) 731(22) 438(22) 1403(28) 2572(42)...217(20) Fritz et al. (2007)§ 95ADK1A Adirondack Mountains, 3.295 577(29) 756(23) 128(13) 1461(39) 208(19)...MOSENFELDER AND ROSSMAN: H AND F IN CLINOPYROXENE region were used to confirm polarization directions, and |  | | Journal (article/letter/editorial) | | niigataite for the type locality, in the Itoigawa-Ohmi district, Niigata Prefecture, in central Japan (Miyajima...in a sample of pumpellyite rock from the Wakasa district, Tottori Prefecture, Japan. The host rock consisted...Tashelga River, Gornaya Shoria, in the Kemerovo district of southwest Siberia, Russia (Shepel’ and Karpenko...Island, Quebec, Canada; the Kyshtymsk district, Ural Mountains, Russia; and at Bastnaes and at the Ostanmossa...Ontario, Canada; several localities in the Eifel Mountains, Rhineland-Palati- nate, Germany; Wilmot Pass |  | | Journal (issue) | | 142 Well-Formed Tsavorite Gem Crystals from Tanzania Robert E. Kane, A n t h o n y R. I...nickel (depending on the color desired) into a region that extends just below the surface of the otherwise...permitted microprobe analysis of both the near-surface region affected by the diffusion treatment process, as...colorless part (spectrum a), and i n the outer blue region (spectrum b), of a diffusion-treated blue sapphire...LOCATION, AND ACCESS When the Spaniards arrived in the region that is now Guatemala (about 1519), Mayan chiefs |  | | Journal (issue) | | official name. Until 1991, zoisite occurred in Tanzania in only two vari01 9 9 2 0 8 m d ~ ~ t i I v t...zoisite has been discovered in the Merelani Hills of mineral-rich Tanzania. The geinological properties are...tanzanites, fist forlnd in the Merelani Hills gem-mining region of Tanzania in early 1991. The stones range...and Bank, 1978-79). The other gem zoisite from Tanzania is a lnassive opaque green variety, colored by...area, several hundred kilo~netersnorthwest of Merelani. This aggregate of zoisite and hornblende is called |  | | Journal (article/letter/editorial) | | underground in 1903 on the Veta Madre, Guanajuato district, Guanajuato. Philadelpia Museum photo. veins...(Kessler 1977). Fluorites from throughout this region are readily recognized by abundant petroleum inclusions...the fluorite deposits of the Illinois fluorite district (Heyl 1982; Goldstein 1997; Lillie and Goldstein...Hicks Dome, which hosts the Illinois fluorite district (Heyl 1982), so the differences may be less than...with associated fluorite. The eastern part of this region was the world’s principal producer of celestine |
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D-Block Mine, Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region, Tanzania