 | | 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 (chapter) | | have resulted from later regional mapping by the Tanzania Geological Survey, together with radiometric dating...shield volcanoes (Elanairobi, Olmoti, Loolmalasin, Ngorongoro, Oldeani, Gelai, Ketumbeine, Tarosero, Monduli...Kilimanjaro). Some of these basaltic volcanoes, Ngorongoro, Olmoti, Elanairobi (collectively termed the... 1972) but there is no equivalent in northern Tanzania of the earlier Kenyan flood phonolites, dated...identifications by the petrographic laboratory of the Tanzania Geological Survey, or on whole-rock chemistry |  | | Journal (article/letter/editorial) | | calculations of varicoloured kyanites from Loliondo, Tanzania Manfred Wildner & Anton Beran & Friedrich...varieties of kyanite, ideally Al 2 SiO 5 , from Loliondo, Tanzania, have been characterised by electron microprobe...kyanites of gem-quality from the Tanzanian locality Loliondo appeared at the mineral market and great attention...deep blue colour, reported to occur in the same region, were provided for a comparative investigation...Crystal slabs of the varicoloured kyanites from Loliondo, Tanzania, as prepared for the spectroscopic investigations |  | | Journal (article/letter/editorial) | | eruption of the carbonatite volcano Oldoinyo Lengai, Tanzania: mineralogy of the ash and implications for formation...e with minor amounts of K-Fe-sulphide and Mn-magnetite in a sparse matrix of alkali carbonate. The absence...nepheline, combeite, melilite, Oldoinyo Lengai, Tanzania. Introduction O LDOINYO L ENGAI , the world’s...volcano, lies in the Gregory Rift Valley in northern Tanzania, eastern Africa (2.764ºS, 35.914ºE). First observed...was as far as Seronera, 130 km to the west, and Loliondo, 72 km to the north-west (Dawson et al., 1968) |  | | Journal (article/letter/editorial) | | Metamorphic Terrane of the Mozambique Belt in Tanzania E. MALISA and S. MUHONGO Department of Geology...of Dares Salaam, P.O. Box 35052, Dares Salaam (Tanzania) Abstract Malisa, E. and Muhongo, S., 1990. Tectonic...metamorphic terrane of the Mozambique Belt in Tanzania. Precambrian Res., 46: 167-176. The Proterozoic...lithostratigraphic units of the Mozambique Belt in Tanzania constitute the multiply deformed and polymetamorphic...mineralizations of these metamorphic terranes in Tanzania are formed either by metamorphic-hydrothermal |  | | Book (volume) | | 58 Cumengite Amelia Mine, Santa Rosalía, Boleo District, Baja California Sur, Mexico, 61 Diaspore Amatolia...Dioptase Omaue Mine, Kaokoveld Plateau, Kunene region, Namiba, 53 Emerald Consorsio Mine, La Pita Dist...53 Ludlamite Huanuni, Oruro Dept, Bolivia, 21 Magnetite (with Peridot) Naran-Kagan Valley, Kohistan Dist...Shattuckite), Omaue Mine, Kaokoveld Plateau, Kunene region, Namibia, 13 Morganite Mawi, Laghman, Nuristan...Nuristan Prov., Afghanistan, 2,3 Peridot (on Magnetite) Naran-Kagan Valley, Kohistan Dist,, Pakistan, 51 Phosphophyllite |  | | Journal (article/letter/editorial) | | Mineral Resources Division, P. O. Box 903, Dodoma, Tanzania. 55 Geologische Rundschau, Bd. 57 ~ Aufs~itze...volcanoes in the Neogene volcanic province of northern Tanzania, is situated in the Gregory Rift Valley of East...September, 1965, Mr. H. Cameron of Loljoro, Arusha, Tanzania, flew over the mountain, and a photograph...Seronera, 80 miles to the west of the volcano, at Loliondo, 45 miles to the north-west, and at Shombole,...pyroxene. Minor apatite, sphene, wollastonite, magnetite, and occasional grains of pyrite and calcite are |  | Tarantola, , Voudouris, , Eglinger, , Scheffer, , Trebus, , Bitte, , Rondeau, , Mavrogonatos, , Graham, , Etienne, , Peiffert, (2019) Metamorphic and Metasomatic Kyanite-Bearing Mineral Assemblages of Thassos Island (Rhodope, Greece) Minerals, 9 (4) 252 doi:10.3390/min9040252 | Journal (article/letter/editorial) | | Ti-hematite, titanite, rutile and apatite (Figure 6b). Magnetite with hematite exsolution was noticed. The mineralogy...localities are very rare on Earth. The Loliondo deposit (Tanzania) is characterized by elevated MnO content...analyses) remain far below that of orange kyanite from Tanzania. This is consistent with an orange color less...less intense in kyanite from Trikorfo than from Loliondo. All kyanite samples show Zn in a significant amount...(Germany, Belgium, Japan, Australia, Brazil and Tanzania) usually provide small or altered crystals [16 |  | | Journal (issue) | | feldspar crystals. INTRODUCTION The South American region known as Patagonia, a barren tableland between...the spectacular pseudomorphs of hematite after magnetite from the Altiplano de Payun Matru near Malargue...called “the Pampas”—a very rugged and windswept region which nevertheless is home to various flora and...in 1985 in order to maintain possession of the region and its tourism income. In the summer months the...potentially lethal enterprise. The strong winds in this region reach around 150 kph (90 mph) and over. We made |  | | 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 (issue) | | crystals found include titanite, clintonite, magnetite as rosettes, and goethite pseudomorphs after pyrite...specimens from the Red Cloud mine in the Silver District of La Paz County, Arizona are widely regarded...were esteemed by the early Native Americans of the region. Arkansas quartz crystals have been responsible...Larson The Himalaya dike system in the Mesa Grande district of San Diego County, California consists of several...these occurrences are not in the famous Mother Lode region, but rather are located in either the East Belt |  | | 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 |  | | Journal (issue) | | scalenohedral calcite crystals. The Terlingua mercury district, with a few smaller, adjacent districts in Texas...cutting coarse-grained reddish granites of the hilly region thereabouts, known geologically as the Llano Uplift... 15 cm, from the Wagholi quarry complex, Pune District, Maharashtra, India. Don and Laura Aaron photo...Liubao, Wuzhou Prefecture, Guangxi Zhuang Autonomous Region, China. Don and Laura Aaron photo. Drusy quartz...Almagro, EI Salado, Chaiiaral Province, Atacama Region, Chile. Don and Laura Aaron photo. Calcite, 3 |  | | Journal (issue) | | Central Madagascar | Spessartine from Engare Naibor, Tanzania | Update on Colourless HPHT-grown Synthetic Diamonds...emerald deposit was discovered in 2021 in the Chitral region of north-western Pakistan. Following an earlier...Shaokui Pan Comparison of Emeralds from the Chitral District, Pakistan, with other Pakistani and Afghan Emeralds...the past decade, the Numbi area in the South Kivu region of the Democratic Republic of the Congo (DRC) has...Athiliwewa) in Sri Lanka, Umba and Tunduru in Tanzania, and Bekily in Madagascar (Schmetzer & Bernhardt |  | | Report (issue) | | carats from localities around the world, including Tanzania, Nigeria, and Russia, show some of the many colors...Mountains, Khenifra Province, Meknes-Tajilalet Region, Morocco; the large, central crystal is 4 mm wide...uranium-vanadium deposit of the Sandy Mine in the Laguna District, New Mexico, is the type locality for goldmanite...include Cambrian black shales in China and a magnetite skarn in Tashelginskaya, Russia. A manganese-rich...of the Kao Kimberlite Pipe in the Butha-Buthe district of the landlocked African Kingdom of Lesotho. |  | | Journal (issue) | | Nanocut Plasma-Etched Diamonds Chrysoprase from Tanzania Demantoid from Italy THE QUARTERLY JOURNAL OF...Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and Nathan...the Kagem mine, Zambia • Yellow grossular from Tanzania • An unusual blister pearl • Myanmar report •...Kashmir (in what is now the Indian part of the region) in 1881 after a landslide revealed the blue gems...(Atkinson and Kothavala, 1983). Although the Kashmir district has been at the center of a hostile border dispute |  | | Book | | Carbonatites - Tanzania - Oldoinyo Lengai Region - Congresses. ism - Tanzania - Oldoinyo Lengai Region - Congresses...Congresses. 3. Oldoinyo Lengai (Tanzania) I. Bell, Keith, 1938- . II. Keller, J. (J6rg), 1938III. Series...the East African rift in northern Tanzania near the Kenya-Tanzania border, south of Lake Natron, and...of the Neogene-Quaternary volcanoes in northern Tanzania (Fig. 1). It is one of a group of nephelinite...the last major phase of faulting at 1.2Ma in the Tanzania sector of the Gregory Rift Valley (Dawson 1992) |  | | Journal (issue) | | 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John M. Saul...“D-TO-Z” DIAMONDS diamonds from the Cape of Good Hope region, and “Jager” for colorless diamonds with strong...of color in a diamond. In the New York jewelry district on Maiden Lane, neighboring buildings were painted...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note |  | | Journal (issue) | | 2023 Articles The Bairendaba Deposit, Keshiketen District, Inner Mongolia, China..........................363 by C. J. Stefano The Nakhlak Mine, Anarak District, Esfahan Province, Iran.........................50 years of collecting in the Cobalt, Ontario, District; being a true collector personality, he has also...on the minerals of the Val Graveglia manganese district in Italy; and Renato and Wendell Wilson received...4047940 The Bairendaba Deposit Keshiketen District Inner Mongolia, China Wendell Wilson1 Robert Lavinsky2 |  | | Journal (issue) | | Transbaikalia (label says "AdunChilon, Nerchinsky district; Siberia"), Russia. GMKFU #5753. 26. Beryl (emerald)...(Laksmanovskoe) deposit (Akhtaragda), Mirninsky region, Western Yakutia, Russia. GMKFU # 12163. 33. Andradite...12 x7 cm. Vilui deposit (Akhtaragda), Mirninsky region, Western Yakutia, Russia. GMKFU #4882, delivered...Mussin-Pushkin (1795-1862), trustee of schools in the Kazan district in 1827-1844, one of the first donators to Museum...signature and notes: "Siberia, Adun-Tchilon, Nerchisky district". Another old specimen is a group of topaz crystals |  | | Book | | Element Characteristics of Danburite from Mexico, Tanzania, and Vietnam Reprinted from: Minerals 2018, 8...Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights...as a late magmatic accessory phase from Mexico, Tanzania, and Vietnam. Differences in the rare earth elements...on another occurrence of sapphires in the same region of the South Urals occurring in anorthosites (kyshtymites)...evolution of alluvial sapphires from the Orosmayo region (Jujuy Province, NW Argentina) and importantly |  | | Book | | nice scorodite from Hemerdon Mine near Plympton, magnetite from Hayter Mine on Dartmoor, autunite from Merrivale...Austell. This was my first trip to the china clay district. Looks just like a moonscape. We got permission...and campylite etc. We then drove up to the Lake District to the Caldbeck Fells and went first to Dick's...England specimens we had collected from the Lake District in May. After our meal we went over to Babbacombe...out the specimens that we collected in the Lake District recently. We tossed a coin and I picked out a |  | | Thesis/Dissertation | | .............................. 18 2.5.2.1.1. Tanzania ............................................................................. 27 2.5.4.1.1.2. Tanzania ............................................................................. 40 2.5.9.1.1.1. Tanzania and Kenya ................................................................... 42 2.5.9.2.2.1. Tanzania ................................................term was first used for alexandrite from the Urals region in Russia. The stone appears green in daylight |  | | Book | | localities for good ilmenite crystals exist in the region (Brunet, I 977b ). NEW YORK Amity, Orange County...Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...assemblage of the vein-dike consists of ilmenite. magnetite, anatase, biotite, microcline and minor fluorapatite...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 |  | | Catalog/List | | and Mail) Heritage Auction Galleries Design District Annex 1518 Slocum St. • Dallas, Texas 75207 Thursday...Oak Lawn Ave. #606 • Dallas, Texas 75207 Design District Annex • 1518 Slocum Street • Dallas, Texas 75207...Heritage Natural History Annex 2. Heritage Design District Annex 17094 Natural History Specialist Steve...RUTILATED QUARTZ GROUP Novo Horizonte, Bahia, Northeast Region, Brazil Two large, water-clear prisms of Quartz...REPLACED LAUMONITE Bombay Quarry, Mumbai District (Bombay District), Maharashtra, India A large aggregate |
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