 | | 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 |  | | Report (issue) | | mine, Moulay Bouazza, KhĂ©nifra, MeknĂšs-Tafilalt region: Joan writes a bit mysteriously that âThey come...mine, Moulay Bouazza, KhĂ©nifra, MeknĂšs-Tafilalet region, Morocco. Rosell Minerals specimen and photo. ...Oumjrane mining area, Er Rachidia, MeknĂšs-Tafilalet region, Morocco. Fabre Minerals specimen and photo. Morocco...Alnif in Er Rachidia Province, MeknĂšs-Tafilalt regionâsee, in the January-February 2011 issue, my report...Oumjrane mining area, Er Rachidia, MeknĂšs-Tafilalet region, Morocco. Spirifer Minerals specimen and photo |  | | Journal (article/letter/editorial) | | ïŹuor-uvite samples from East Africa (Landanai, Arusha Region, Tanzania) with 0.45 ± 0.04 apfu [4]Al; MacDonald...Mössbauer and structural parameters in elbaite-schorl-dravite tourmalines. Am. Mineral., 93, 658â666. Berryman...crystal structure: Investigation of synthetic K-dravite, dravite, oxy-uvite, and magnesio-foitite using SREF...Linking structure and chemistry in the schorl-dravite series. Am. Mineral., 84, 922â928. Bosi, F. & Lucchesi...crystal chemistry of tourmalines of the schorl-dravite series. Acta Univ. Carol. Geol., 3, 223â264. Prowatke |  | | Catalog/List | | Ammoniotinsleyite xls Punta de Lobos, 90 km south of Iquique, I Region, Tarapaca / Chile; Pinkish crystals of up to 1...(xls) Arakawa, Minamiboso City, Chiba Pref., Kanto Region, Honshu Island / Japan / TYP; The extremely rare...Pegmatite, Mererani, Simanjiro District, Manyara Region / Tanzania; The rare and new mineral of the tourmaline...tourmaline crystals. These are mixed crystals from Dravite (brown), Elbaite (light green) and Darrellhenryite...(xls) Tsumeb Mine, Tsumeb, Otavi Mts., Otjikoto Region / Namibia; Ore-microscopic and via REM-EDX visible |  | | Journal (issue) | | 501-505 Pxy-vanadium-dravite : crystal structure and redefinition of the "vanadium-dravite" tourmaline 506-511...Microminerals of the Bellerberg volcanics, Eifel region, Germany 191-198 HaĂŒy crystal models at the University...Medrelani, Arusha region, Tanzania 179-183 Fluorapatite from the Karo Pit, Merelani Hills, Arusha region, Tanzania..."tanzaniet" van Merelani Hills, Lelatema Mts, Arusha-gebied, Tanzania 4. Vivianiet van Huanuni, Dalence Province |  | | Journal (article/letter/editorial) | | ASSOCIATED GEMSTONE MINERALIZATION AT MERELANI, TANZANIA C. HARRIS Department of Geological Sciences, University...Merelani area of northeastern Tanzania, a structurally complex region consisting of granulite facies...rare minerals and gemstones (such as axinite, dravite, fluorapatite, prehnite and tremolite). The ÎŽ18O...unique to the area around Merelani in northeastern Tanzania. The tanzanite deposits, mined along strike distance...ASSOCIATED GEMSTONE MINERALIZATION AT MERELANI, TANZANIA Figure 1. (a). Sketch map of the Lelatema antiform |  | | Catalog/List | | the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on the back of...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Pseudomorph after Azurite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the...Epimorph on Cerussite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia The multiple stages of mineralizing fluids |  | | Journal (issue) | | market such as blue sapphires from Madagascar or Tanzania, inclusion and chemical information may be insufficient...pleochroism in twinned alexandrite from Lake Manyara, Tanzania; the twin boundary separates a first individual...Brazil, Sri Lanka, Madagascar, Zimbabwe, India and Tanzania, are being compiled and, in combination with trace...Figure 21: Alexandrite trilling from Lake Manyara, Tanzania. Top: view parallel to the a-axis; the three individuals...transitions between them occur in the microwave region. The EPR spectrometer registers the microwave absorption |  | | Book | | (length-slow), in staurolite schist; Snake Creek, Mt.Isa region, Queensland, Australia. The staurolite (Fig. 1...quartzo-feldspathic metavolcanic rock; Nisserdal region, Telemark, Norway. 77 Yell.-brn. or brown (1...quartzo-feldspathic metavolcanic rock; Nisserdal region, Telemark, Norway. 87 XPL Fluorite (arrowed)...quartzo-feldspathic metavolcanic rock; Nisserdal region, Telemark, Norway. x100 88 Non-isotropic16...pleochroism. PPL Arfvedsonite in syenite; Oslo region, Norway. 59 124 ARFVEDSONITE(âź) x50 60 A |  | | Journal (issue) | | of Aurora Gems; (6) a 9.15 ct ruby from Winza, Tanzania, courtesy of Hakimi & Sons; (7) a 14.80 ct âgoldenâ...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...licensed to mine tanzanite at Block C in Merelani, Tanzania. This high-security screen enclosure (designed |  | | Journal (issue) | | compositions. For example, species ranging from oxy-dravite to povondraite are typically found in saline, oxidizing...that the alkali species of tourmalineâelbaite, dravite, and schorlâform in fluids with greater than 0...top is the full spectrum of a blue spinel from Tanzania, followed by the sum of the three individual components...spinel from Vietnam, Sri Lanka, Madagascar, and Tanzania, we have isolated three unique and consistent...can be 0.7 0.6 0.5 Blue spinel from Tunduru, Tanzania 0.4 0.3 SUM Fe3+ IV 0.2 VI Co2+ 0.1 Fe2+ |  | | Catalog/List | | $3,500 - 4,500 32 | BONHAMS 2069 2071 2071 DRAVITE (ORANGE TOURMALINE) This attractive oval-cut tourmaline...having the green sheen for which amber from this region is noted. Graduating in size from 21.6 to 16.6...iron oxide layers, diffract the Sonoran Desert region, stretching from southwest United States and allow...France Those familiar with specimens from this region will comprehend how rare it is to obtain a cut...these garnets are found on both sides of the Kenya/Tanzania border. They are usually found as crystalline |  | | Journal (issue) | | Quarz. Breite 5,6 cm. Alle Stufen kommen aus der Region Pasto Bueno. Sammlung und Fotos J. Hyrsl. MundoNuevo...dieses Vorkommens Graphit in Quarz aus Merelani, Tanzania. Breite s,2 cm. Sammlung und Foto J. Hyrsl. enthalten...mm dicke scheibchenförmige Gebilde im in dieser Region liegenden bedeutenden Vorkommen von Little Falls...Turmalinen in einem Quarz-Cabochon (28 197 et), Region Chapada Diamantina, Bahia, Brasilien. 5. Pseudomorphosen...Quarz orientiert. Mn-reicher Epidot in Quarz aus Tanzania. Gewicht bis 61,06 et. Foto R. Weldon; mit Genehmigung |  | | Report (issue) | | blue/yellow-green crystals from Merelani Hills, Tanzania; Slyudyanka, Russia; Mogok, Myanmar. Color Change...of the ion' s intense absorp tion in the visible region. Op tical absorp tion sp ectrafrom ap atite colored...broad absorp tion p eak in the 640 nanometer (nm) region (grap h right) . Ribeiro et al. (2005) found that...area and p egmatite ap atites from the Ambilobe region, both in Madagascar) also changes the samp les...uora patite, 2.2 cm tal l Karo Pit, Merelani, Tanzania The color is a green-blue when viewed perpendicular |  | | Journal (issue) | | of a huge industry in this arid, inhospitable region. Later, diamonds were also discovered and mined...to 90 m above sea level. In South Africa, in the region between the Orange River and Port Nolloth, diamonds...Jadeite of Guatemala Tsavorite Gem Crystals from Tanzania Diamond Grit-Impregnated Tweezers Fall 1990 Majorica...reportedly had been recovered recently from the same region of the Urals where the historic deposits were mined...Figure 5. A mine i n the Lelatema Hills of northern Tanzania was the source of this 1.18-ct diopside. Photo |  | | Book (edition) | | NIGERIA eâ TAHITI Tahitian Pearl BRAZIL Agate TANZANIA Amethyst AAA Tanzanian Ruby AAA Tanzanite Alexandrite...Tourmaline - „ Rubellite Shimoyo Rubellite - Dravite Chrome Tourmaline - - Unakite - - - - ...their change colours vary depending on origin, Tanzania is currently the main producer of Colour Change...from Tanzania (Songea), while âblue to purpleâ Colour Change Sapphires are also found in Tanzania (Tunduru)...Brazil, Burma, Madagascar, Mozambique, Sri Lanka, Tanzania and Zimbabwe have all produced small quantities |  | | Report (issue) | | nothing more of interest seemed to come out of the region until November 2002, when people from around Mandrosonoro...Madagascar to study some pegmatites in the Betafo region. Observing the exceptional tourmaline rough arriving...pegmatite vugs in Heftetjern near T0rdal in the Oslo region of Norway; in Kazakhstan; and in Mount Antero,...identified as bazzite until 1939. Fibbia in the Gotthard region in the canton of Tessin is a long known locality...Capranica in Viterbo Province in Italy's Latium region. Ignimbrite C sometimes contains a lot of volcanic |  | | Book | | localities for good ilmenite crystals exist in the region (Brunet, I 977b ). NEW YORK Amity, Orange County...in Switzerland, it is only in the Maderanertal region of east-central Canton Uri that clefts bearing...clefts are found fairly commonly throughout this region, such that only a handful of notable finds during...about 20 other quartz mines are operated in the region of the Subpolar Urals, northwest of Saranpaul,...collected intermittently from pegmatites of the region, associated with crystals of corundum, rutile, |  | | Catalog/List | | ..........................................130 Tanzania ..........................................................................................140 Tanzania ................................................coloration - very diagnostic of material from the region. Overall Measurements: 6.9 x 3.9 x 3.7 inches (17...purple Fluorite characteristic of specimens from the region. Overall Measurements: 13.8 x 7.3 x 5.7 inches...Tsumeb Lunch Box Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia Ever the collector of the weird, outrĂ© |  | | Book (volume) | | cm1 is called the fingerprint region. Usually IR spectrum in this region contains very complicated series...overlapping bands. The importance of the fingerprint region is that each mineral species produces a different...500 to 800 cm1 can be considered as âfingerprint regionâ sensitive to the composition and the topological...see Fig. 1.9), but generally IR spectrum in this region is characteristic of all these minerals. In IR...vibrations of a large number of atoms within the region of coherent vibrations. However, in real periodic |
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Arusha Region, Tanzania