 | | 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...pg. 267 271 Chrysoprase and Prase Opal from Haneti, Central Tanzania James E. Shigley, Brendan M. Laurs...characteristics of Tanzanian chrysoprase and green prase opal are revealed. 280 Demantoid from Val Malenco...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 |
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| WINTER 2011 PAGES 259–336 Dyed Purple Ethiopian Opal Garnet Composition from Gem Properties Symmetry...Purple Hydrophane Opal Nathan Renfro and Shane F. McClure Evidence indicates that opal with a vivid purple...phosphorescence • Clarity-enhanced opal with artificial matrix • Ethiopian black opal • Coated bead-cultured freshwater...Chondrodite from Tanzania • Blue dolomite from Colombia • Fluorite from Namibia • Common opal from Western...Western Australia • A bicolor, bi-pattern hydrophane opal • Chatoyant quartz with cinnabar inclusions • Quartz |
 | | Journal (issue) |
| for this study were purchased at two Los Angeles-area lapidary supply shops (figure 2). A number of dealers...breaking table surface appears iridescent in one area No additional change No additional change No additional...Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic...resulted from the limited mining that continued in the region. Today, though, there appear to be large quantities...Malysheva, situated in the old Talzovaya River mining area. Apparently, the Malysheva mine has been exploited |
