 | | Journal (issue) | | Colombian Emeralds Ron Ringsmd The Elahera Gem Field in Central Sri Lanka Mahinda Gunawardene and Mahinda...COLOMBIAN EMERALDS By Ron Ringsrud The Muzo emerald district, i n Boyacd, Colombia, contains several mines...used to describe the best. Yet Colombia's Muzo district actually encompasses several mines, of which two...emeralds mined in Colombia come from the Muzo district, and the Coscuez mine has grown to become the...Colombian emeralds among the local Indians as far north as Mexico and as far south as Peru and northern |  | | Journal (issue) | | Number 2 TABLE OF CONTENTS FEATURE ARTICLES 62 Sri Lanka: The Gem Island Peter C. Zwnan The Identification...a n y fine gemstones found on the island o f Sri Lanka, the subject of Peter Zwaan's article i n this...this issue. This fine 9.57-ct cabochon from Sri Lanka is pictured here against a 19th century lithograph...not of the publishers. SRI LANKA: THE GEM ISLAND By Peter C. Zwaan Sri Lanka, formerly Ceylon, remains...mined by primitive methods. In many instances, the Sri Lankan origin of the gemstone can be determined by |  | | Journal (issue) | | Spinels of Mogok β A Brief Overview Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search...Responsibility 94 Book Review Discovering the Gems of Sri Lanka 98 100 108 113 Members 14 Saurabh Bansal Damien...Shirley Xue Li Zhang, Hong Kong E. Gamini Zoysa, Sri Lanka Advisors Jean Claude Michelou, Colombia Ruben...countries, as well as Ilakaka in Madagascar and Sri Lanka (Langerwey, 1974; Gorghinian et al., 2013). Until...Myanmar with the Mogok mining districts in the north-central part of the country. Spinel is occasionally |  | | Book | | nucleation initiation of crystal growth. nucleus the central portion of an atom, positively charged and containing...anatase in rock crystal β’ apatite in garnet, kornerupine, corundum and spinel β’ chromite in emerald β’...spinel in ruby zircon in garnet, corundum and kornerupine Many of these minerals also occur syngenetically...pyrochlore) and zircon crystals are common in Sri Lanka gemstones. The more important syngenetic mineral...biotite mica in andalusite, chrysoberyl, kornerupine and Sri Lanka sapphire β’ calcite in Burmese ruby and |  | | Journal (issue) | | spinel samples. The marbles were analyzed by the Central Analytical Laboratory and the Polevskaia Laboratory...that has been called the "Uralian ruby-bearing province" (Kissin, 1990a). To date, approximately 100-150...approximately 50,000); Chelyabinslz-about 120 lzm to the north-is the largest city (population: about 1.2 million)...(structural)features: (I) Western Uralian fold belt; (11) Central Uraliun Uplift; (111) Tagilo-Magi~itogorosliii...Light-colored calcite marble in Kootchinskoye quarry's north wall is representative of material i n which ruby |
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