 | | 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...greener-than-emerald tsavorite. Unique geochemistry in the area holds out the possi~ility of additional new finds...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 |  | | Journal (issue) | | Nanocut Plasma-Etched Diamonds Chrysoprase from Tanzania Demantoid from Italy THE QUARTERLY JOURNAL OF... 271 Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs, and...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...the Paddar area west of Srinagar (Atkinson and Kothavala, 1983). Although the Kashmir district has been |  | | Journal (issue) | | brealzdown of dolomite, for CO,] within the peridotite area of stability in the mantle, resulting in the selfdestruction...13. Inspection of this figure will show a shaded area in the narrow range of - 2 to - 9 813C, with a peak...peak between - 5 and - 6 613C. This is the area in which almost all peridotitic diamonds will plot. Although...peridotitic rock origins is illustrated here. The shaded region, wilh 613C val~resof - 2 to -9, is the ronge for...plate being moved downward (subduction) into a region of higher pressures and temperatures below a craton |
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