 | | Journal (article/letter/editorial) | | are known from the Rubikon mine in the Karibib district of the Erongo region. The GIA collection has two...cat’s-eye, from left 11.40, 8.02, and 9.60 carats, Sri Lanka, India, and Myanmar (Burma). No polarizer. GIA...greenish-yellow—coming from Mwami in the Karoi (Urungwe) district of Mashonaland West. Asia India Although transparent...carats and 10.51 carats, Mwami, Karoi (Urungwe) district, Mashonaland West, Zimbabwe. GIA Gübelin collection;...dramatic yellow to blue pleochroism. Sri Lanka Like India, Sri Lanka is a notable producer of cat’s-eye |  | | Journal (article/letter/editorial) | | of Beryllium and Fluorine in the Gem Fields of Sri Lanka M. S. Rupasinghe 1, A. Banerjee 1, j. Pense 1...Peradeniya, Sri Lanka Abstract. A study of the abundance of Be in the gem sediments of Sri Lanka shows that...pegmatites of the Highland and Southwest Groups of Sri Lanka, very little decomposition of the Be-bearing minerals...granites and pegmatites of the Precambrian of Sri Lanka are presumed to have been formed due to the magmatic...rocks abundant in the main gem bearing areas of Sri Lanka. Fluorine is found in the range of 400-2,000 ppm |  | | Journal (issue) | | Sapphire from the Tan Huong–Truc Lau Area, Yen Bai Province, Northern Vietnam Nguyen Ngoc Khoi, Chakkaphan...Nhung Although not as well known as the Luc Yen district, this area is an important source of ruby and...and zircon from Ethiopia • Sapphire mining in Sri Lanka • Green cat’s-eye spodumene from Brazil • Color-zoned...characteristics of r uby and sapphire from Yen Ba i Province, in nor thern V ietnam. There is an ar ticle by...SAPPHIRE FROM THE TAN HUONG–TRUC LAU AREA, YEN BAI PROVINCE, NORTHERN VIETNAM Nguyen Ngoc Khoi, Chakkaphan |  | | Journal (article/letter/editorial) | | consignment weighing several pounds from the Matale district (Anderson and Payne, 1940). Rapid sorting was...sodium-light on the Tully, Rayner, and Special Rayner (spinel and diamond) direct-reading refractometers, and |  | | Book | | 198 200 Republic of South Africa Namibia 202 Sri Lanka 203 Tanzania 203 201 171 Contents USSR 203...across the narrow straits separating the island of Sri Lanka from the Indian mainland, the gravels of that...Aquamarine is regularly found in the gem gravels of Sri Lanka, and its transport to India many centuries ago...Red Sea which passed through the emerald mine district, and it could have been a trading centre for these...Probably these mines, in the Wadi and Gebel Sikait district, correspond to those labelled ‘Ethiopian’ by Pliny |  | | Book | | 200 Republic of South Africa 201 Namibia 202 Sri Lanka 203 Tanzania 203 171 Contents USSR 203 United...across the narrow straits separating the island of Sri Lanka from the Indian mainland, the gravels of that...Aquamarine is regularly found in the gem gravels of Sri Lanka, and its transport to India many centuries ago...Red Sea which passed through the emerald mine district, and it could have been a trading centre for these...Probably these mines, in the Wadi and Gebel Sikait district, correspond to those labelled 'Ethiopian' by Pliny |  | | Book | | Mineral Ruby and Sapphire Chrysoberyl, Topaz and Spinel Beryl The Garnet Group Tourmaline and Zircon Quartz...gravel C. Corundum group D. Chrysoberyl and spinel E. Beryl group F. Garnet group G. Topaz and...for hydrostatic weighing 11(1). Derivation of ‘spinel’ contact twin (‘made’) in diamond 116 123 17(1)...the trade and the pubUc in general. Red spinel and blue spinel, for instance, would probably be more in...‘balas ruby’ which have been used in the past for spinel varieties are obviously not acceptable since they |
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