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| April2000 2000 April ' SriLankan Lankan 'f^ ^ < Sri gemdeposits deposits ; . gem LW NwwTN » ., GEPOL...deposits in in the the Okkampitiya Okkampitiya gem gem field, field, Sri Sri Lanka Lanka 1 1 2 V. V.Mathavan...University University ofofPeradeniya, Peradeniya,Sri SriLanka Lanka 2.2.Institutfur Institut für Geowissenschaften...discovered recently recently in inthe theOkkampitiya Okkampitiya gem gem field field which which isissituated...situated in in south-eastern south-eastern Sri Sri Lanka. Lanka. These These are are (1) (1) the the gem-bearing |
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| THE ORIGIN OF GEMSTONES TISSA MUNASINGHE OF SRI LANKA AND C. B. DISSANAYAKE Department of Geology...Geology, University of Peradeniya,Peradeniya,Sri Lanka Sri Lanka is well known throughout the world for its...1217 (1972a), the origin of the gemstonesof Sri Lanka has not been considered in any detail. It is the...recent views on the geologic evolution of Sri 81' Lanka. Lithologic Setting o 4/estern Vijoyon Highland...Lithologic divisions and chief gem mining areas of Sri Lanka. Gem-bearingareas outlined by dashes.Darkened |
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| Spinels of Mogok – 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...in Sri Lanka for which the nature of the primary deposits is still unknown. Except for Sri Lanka, Image |
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| iridescent chatoyancy Grey orthoclase moonstone from Sri Lanka has a unique combination of a cat's-eye and a...Brazil and another colourless of 12.20 ct from Sri Lanka, but this specimen is considerably larger. Two...Moonstone with a star and cat'seye combination from Sri Lanka Sunstone cat's-eye from Russia A stone described...purchased in Germany and probably comes from Sri Lanka, where a similar one was offered to the author...located 31.5 km south of the city of Wroclaw in the province of Dolny Slask (Lower southwest Poland (Figure |
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| te calc–silicate granulites from Maligawila, Sri Lanka: evidence for high-temperature isobaric cooling...Geology, University of Peradeniya, Peradeniya, Sri Lanka Institut für Geowissenschaften, Johannes Gutenberg-Universität...overthrusted rocks of the Highland Complex of Sri Lanka, preserve a number of spectacular coronas and...textures; Isobaric cooling, Highland Complex of Sri Lanka Abbreviations: Alm, almandine; An, anorthite;...Geology, University of Peradeniya, Paradeniya, Sri Lanka. Tel.: +94-8-389150; fax: +94-1-883086. E-mail |
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| 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 |
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| ...................... 21 2.5.3.1.2.3. Kerman Province, Iran and Kaghan Valley, Pakistan ........................ 22 2.5.3.1.2.4. Erongo Province, Namibia .................................................................................. 29 2.5.4.2. Hessonite.............................................................................. 117 4.3.1.4. Hessonite.............................................................................. 147 5.9.2.4. Hessonite.............................................. |
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| Laboratory', but many gemmologists make the journey to Sri Lanka or Thailand at least once in their lives, if not...observations on brown tourmalines from Elahera, Sri Lanka Ulrich Henn and Martin Schramm Institut für...description of brown tourmalines from Elahera, Sri Lanka. They were classified as uvite and dravite as...known deposits are located in the Uva region, in the Ratnapura district and in the Tissamaharma area (Dunn...(1977) classified the brown tourmalines from Sri Lanka as uvite and dravite: Results For the analyses |
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| Mongolia|Aging silver-treated cultured pearl|Dyed hessonite imitating ruby|The Mirasety ring Cover Photo:...supplier, the fluorite was mined from Cao Bang Province, northeast of Yen Bai. The crystal surfaces were...29.05 ct fluorite is reportedly from Cao Bang Province in northern Vietnam. Photo by Bilal Mahmood. ...yellow-green grossular from Kambanga, Taita-Taveta District, Voi, Kenya, is notable for having a significantly...at the Tourmaline Queen mine, also in the Pala District (e.g. Larson, 2012). So far, approximately three |
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| instrumentation such as LA-ICPMS—once primarily the province of academia—became a fixture in many gemological...were combined under the jurisdiction of the U.S. District Court of New Jersey 168 PRODUCTION AND MARKETS...addition to the traditional spinel sources of Sri Lanka, Pakistan, and Myanmar (spinel, if polished elsewhere...start operations at the Kagem mine in the Kafubu District, historically Zambia’s largest source of emeralds...ultimately decided in eBay’s favor when the U.S. District Court of New York determined that the burden of |
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| North-West Branch: S. Hill, F.G.A. South Yurkshire & District Branch: J. L Reynolds, F.G.A. Examiners: E. A...with lavas and there is only one major volcanic province - that of Thailand and Kampuchea (Cambodia) -...Garnet rough Garnet, hessonite Fire opal Quartz, smoky Cornelian Topaz Kenya Sri Lanka Mexico Switzerland...Beryl Peridot Brazil Linde, USA Sri Lanka Sri Lanka Mexico Sri Lanka Madagascar Zabargad 1.76 8.65 5... .inde, USA Unknown Unknown Cambodia Unknown Sri Lanka Tanzania Unknown 1.35 10.00 3.77 0.67 8.92 1 |
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| in Colorless, Yellow, and Blue Sapphires from Sri Lanka Kcirl Scl~metzerand Olaf Medenbach REGULAR FEATURES...Banjarmasin-Martapura area of southeastern Kalimantan (the province of Kalimantan Selatan). The gemological characteristics...map shows the two major areas (left the Landak district of western Kali= man tan, below = the Bmjarn~asin-Maitapura...000 guilders worth of diamonds from the Landak district in what is now western Kalimantan. The 367-ct...Banjarmasin, the capital city of Kalimantan Selatan province. In GEMS & GEMOLOGY Summer 1988 this area |
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| extensive fields in the prophetically named Kimberley district of Western Australia promise to be of world importance...cause raised eyebrows, and even more so with ‘Sri Lanka rubies and sapphires’ in place of ‘Ceylon rubies...intermediate and acid members of the volcanic province in southern Brazil and Uruguay, and the fire opals...is in such old river courses in countries like Sri Lanka and Thailand that the water-worn pebbles of many...particularly in the Yun Yang deposit in Hubei Province, China. For many years on the basis of experimental |
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| occur in the John Saul ruby mine, Taita-Taveta District, Kenya (Simonet, 2000) which is located just north...change to green by heating of red corundum from Sri Lanka, and reversion to red by cooling. Thermochromy...of four green tourmalines from the Taita-Taveta District, Kenya. For the present study, the contents of...2000. Geology of the Yellow Mine (TaitaTaveta District, Kenya) and other yellow tourmaline deposits in...the Isalo area of Madagascar, from Ratnapura, Sri Lanka and from Mogok, Myanmar, a nearly complete overlap |
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| field trip to the world-famous Pala pegmatite district in San Diego County will take place August 25...“roiled-effect” growth structures are characteristic of hessonite. When such internal features are present, no further...chromium-pyroxene in diamonds and apatite and calcite in hessonite. Also consider quartz, which Dr. Gübelin once...sapphires from metamorphic rocks (e.g., from Sri Lanka) is completely different from that in sapphires...almandine with fibrous sillimanite from Okkampitiya, Sri Lanka; andalusite with sillimanite fibers from |
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| crystals of apatite so often found in corundum and hessonite garnet are recognized by their well-formed appearance...pyrochlore) and zircon crystals are common in Sri Lanka gemstones. The more important syngenetic mineral...mica in andalusite, chrysoberyl, kornerupine and Sri Lanka sapphire • calcite in Burmese ruby and spinel;...andalusite • sphene in ruby and spinel • uraninite in Sri Lanka sapphire • zircon in corundum. Apatite is a characteristic...distribution of colour such as can be seen in hessonite, garnet, corundum and emerald also ranks as a |
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| crystals of apatite so often found in corundum and hessonite garnet are recognized by their well-formed appearance...pyrochlore) and zircon crystals are common in Sri Lanka gemstones. The more important syngenetic mineral...mica in andalusite, chrysoberyl, kornerupine and Sri Lanka sapphire • calcite in Burmese ruby and spinel;...andalusite • sphene in ruby and spinel • uraninite in Sri Lanka sapphire • zircon in corundum. Apatite is a characteristic...distribution of colour such as can be seen in hessonite, garnet, corundum and emerald also ranks as a |
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| Major sources: Burma, Thailand, Cambodia, Sri Lanka, India, Australia, Kenya, Tanzania, Montana and...Stone Tract in Upper Burma to the gem gravels of Sri Lanka, we find the historical occurrences of rubies...Burma 67 Sapphire - Burma 75 Ruby and sapphire - Sri Lanka 77 Ruby - Thailand and Cambodia 80 Sapphire -...273 Sri Lanka (Ceylon) 273 History 273 Mining areas 276 Mining methods 278 The market in Sri Lanka 280...a polished sword, the Bhramara {the black bee), Sri Krishna (a Hindu God represented as beautiful gray) |
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| following: a clear, pinkish red gem spinel (Ratnapura, Sri Lanka), three almandines (from Garibpet and Rajmahal...Anuradhapura, Sri Lanka; no. 23 in Schüssler et al. 2001), a grossular (Kamburupitiya, Sri Lanka) and two...graphite samples (crystalline from Kahatagaha, Sri Lanka, and disordered from Saskatchewan, Canada). As...Ca-rich almandine-rich pyrope from Anuradhapura, Sri Lanka (i.e. ‘cluster H’, a designation that is still...from Gilg & Gast 2012); and (h) a hessonite from Kamburupitiya, Sri Lanka. Spectra are offset vertically |
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| Drosdov and A.P. Turinge 331 Gems deposits of Sri Lanka E. Gaminee Zoysa 343 Precious and semi-precious...formation were found in Mimecha-Kotui carbonatite province. This deposits are not mining yet for their difficult...modern quartz sand from iron in Pinar-del-Rio province, Cuba. Quartz sand places on the lowland derived...operation in Khingan brucite =magnesite= bearing province, Khabarovsk Territory, USSR. There are small brucitite...part in the Khingan brucite =magnesite= bearing province within Bureinskii old massif . The Amurskaya (presumably |
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| 108 Sapphire and Garnet from Kalalani, Tanga Province, Tanzania Antonin V. Seifert and Jaroslav Hyrsl...107 SAPPHIRE AND GARNET FROM K ALALANI, TANGA PROVINCE, TANZANIA By Antonin V. Seifert and Jaroslav Hyrsl...Although the traditional padparadscha sapphire from Sri Lanka shows more pink and less orange, some reddish...of Science (IEM RAS), in Chernogolovka, Moscow District, Russia. Dr. Lu is a research scientist, Dr. Shigley...Material Synthesis (VNIISIMS) in Alexandrov, Vladimir District, Russia. Please see acknowledgments at the end |
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| finest star ruby on public display. A product of Sri Lanka's gem gravels, today it resides at the Smithsonian...origin is uncertain, but probably emanates from Sri Lanka. Today it rests in New York's Amer1can Museum...473 History 474 Luc Yen 474 Quy Chau (Bu Khang District) 475 Other Vietnam corundu.n1 localities 478 Mining...History 390 Ruby & sapphire variecies 395 Origin of Sri Lanka's corundum deposits 395 Mining areas 396 Mining...marker in Sri Lanka 399 Characteristics of Sri Lanka.n corundLm1s 402 Bibliography- Sri Lanka 405 C Ruby |
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| yellow to brown and bluish white sapphire from Sri Lanka, known as geuda, could be transformed to a fine...concentration of iron. The 1.40 ct heat-treated Sri Lankan sapphire on the right is colored by Mg2+-trapped-hole...like Mg2+. The heat-treated yellow sapphires of Sri Lanka and the natural-color or heattreated yellow portions...colorless sapphire that results from heat treating some Sri Lankan geuda. In such stones, we have the condition...cases of Montana alluvial sapphire, Sri Lankan sapphire, and Sri Lankan geuda, there are many stones |
