 | | 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) | | are from Namibia, South Africa, Zimbabwe, and Tanzania. All the fluorescent images were taken using a...Blue willemite and white dolomite, 6.5 cm, Tsumeb mine. The blue willemite fluoresces bright yellow, and...the UV source; Tsumeb mine. Field of view is 2.2 cm. Figure 3. The Skorpion mine is located close to the...with permission Figure 4. The Okorusu fluorite mine in Namibia was arguably the source of the country’s...country’s finest fluorite specimens. Over the years the mine produced a plethora of multicolored, often-zoned |  | | 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...productive Mwadui diamond mine, known for Yeryfine, rare, pink diamonds. Emerald, alexandrite, garnet, and tourmaline...chrome tourmaline are widely identified with the region. ( continuedon backflap) ♦ ♦ ♦ ♦ ♦ ~...~OSCIENCE 'l'RESS, INC. TbPattiFor sunrises over Lake Turkana, champagne in the Serengeti, and Norfolk |  | | Catalog/List | | it collected when the Tsumeb Mine (as well as other mines of the region) were still in production in...engineering work took him to the Tsumeb Mine in Namibia. This mine is renowned for producing what are arguably...MINERALS 57001 Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the Tsumeb Mine were |  | | Journal (issue) | | schist or dolomitic marble. Chrysoberyl var. alexandrite, locality unknown. Photo: Bob Cooke. is rare...requires unusual environments anyway. To form alexandrite, chromium is needed, and chromium is more prevalent...pegmatites that usually host chrysoberyl. So alexandrite forms only if the geologic conditions are right...conditions must be right to form a gem-quality alexandrite big enough for faceting. Since chrysoberyl is...coveted and therefore valuable is alexandrite, which is also rare. Alexandrite changes color, turning from |  | | Journal (issue) | | emerald occurrences (geographic situation) in the region ChivorlSomondoco-GachahL Chivor/Somondoco-Gachalâ...not only for samples coming from the same mining region, but also for the (mean) concentrations in emeralds...a certain mining field or a certain geographic region. our With regard to to magnesium and and sodium...MgO) were observed in the the emeralds the mining region of Gachahi. Gachalâ. The The highest from the 1%...participation of the he evaporites present in the whole region) are more »re than probable locally restricted |  | | Report (issue) | | must know not only in which direction a particular mine opening should be extended to continue in an ore...utilization of the manganese deposits in the Nikopol region, U.S.S.R., described in the chapter on "Manganese...changing as the advance of technology permits us to mine or process minerals that were once too low in grade...technologic advances will make it profitable to mine resources that would be much too costly to produce...are at least a few prematurely deserted mills and mine installations built on the expectation of finding |  | | Book | | weathering. Sedimentary deposits are enerated on sea, lake, river and marsh bottoms with formation of stratified...sediments of seas and oceans as well as in river or lake sediments and on valley slopes. U, Cu, native sulfur...and geological structure are isolated in the ore region territory. Ore fields consist of ore deposits enclosing...are called native, while ores produced from river, lake, sea and ocean sands are called placer. Ore structure...end of the 19th century the most of the runof mine copper ore contained 58 % of copper, but this figure |  | | Book | | prospect for mineral deposits. In places, ancient mine workings have survived to our time (Fig. 1). Of...Petersburg for further study. In 1763 he appealed to the mine owners asking them “ to supply specimens of various...Observing daily the behaviour of ores in mine workings, the mine geologist grasps better than anybody else...exception to this are those deeper parts pene trated by mine openings and oil wells. At the Witwatersrand gold... when freshly extracted from deep horizons of a mine, is perfectly colourless, transparent, and has a |
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Magara mine, Lake Manyara, Arusha Region, Tanzania