 | | 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) | | 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...deposits are located in the Uva region, in the Ratnapura district and in the Tissamaharma area (Dunn, 1977...(1977) classified the brown tourmalines from Sri Lanka as uvite and dravite: Results For the analyses |  | | 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) | | Namibia|Colourchange axinite-(Mn) from Tanzania|Green fluorite from Pakistan and Vietnam|Bicoloured grossular... Mineralogical Record, 39(2), 131–135. Green Fluorite from Stak Nala, Pakistan Pegmatites at Stak Nala...tricolour tourmaline with white albite and green fluorite. According to gem dealer Dudley Blauwet, there...been sporadic production of small amounts of gem fluorite from Stak Nala since 1982. In June 2013, he obtained...4 3.3 400 of broken fragments of Stak Nala fluorite while visiting Skardu, Pakistan. He sent the 12 |  | | Report (issue) | | (2) 1.3 Total 100.25 100.67 (1) Balangoda, Sri Lanka. (2) Axel Heiberg Island, Canadian Arctic Archipelago;...Brazil); fluorite, nepheline, pyrochlore, allanite (Monte Somma, Italy). Distribution: At Rakwana and Balangoda...Balangoda, Sri Lanka. From Monte Somma, Campania, Italy. In Russia, large crystals from the Kovdor massif...Co., Montana, USA. In the Bingo deposit, Kivu Province, Congo (Zaire). From Catanda, Angola. At Benfontein...Joseph Baddeley, who first called attention to the Sri Lankan material. Type Material: The Natural History |  | | Journal (issue) | | (Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia, and China)...come from a number of sources, but predominantly Sri Lanka. Accented with smaller diamonds, the 129 gem corundums...Boehm, March 1993. the alluvial gem fields of Sri Lanka and the pegmatite districts of Brazil. Efforts...Asia (Thailand, Cambodia, Myanmar, Vietnam, and Sri Lanka; again, see figure 1). Although mining continued...high-quality blue and pink sapphire came from Sri Lanka and, more recently, Madagascar (Suwa, 1999). In |  | | Book | | notable example in this category is the Nuristan District of Afghanistan, which over the past 10 years has...Saijo, Iyo Province, Ehime Prefecture, Island of Shikoku Ashio Mine, Shimotsuke Province, Tochigi Prefecture...Arakawa Mines, Ugo Province, Akita Prefecture, Honshu The Obira Mine, Bungo Province, Oita Prefecture,... Hyuga Province, Miyazaki Prefecture, Kyushu Otome Mine, Suisho Pass, Kurobera, Kai Province, Yamanashi...Prefecture, Honshu Mino Province, Gifu Prefecture, Honshu; and Omi Province, Shiga Prefecture, Honshu |  | | Journal (issue) | | hematite coating; these are from Leichang. Guangdong Province. C hina. There also were some dark red- purple...imen because it had a few small dark bright green fluorite crystals associated. Aquamarines from Namibia...with quartz from Uchucchacua Mine, Dos de Mayo Province, Lima Departmet Peru. There were a few speci mens...quartz from Darya Pech area, Nuristan, Kunnar Province, Afghanistan. A Cabinet piece had a I l/2 x 2...new find in Sare Saug. Kokccha Valley, Badakshau Province, Afghanistan . These were some of the best quality |  | | Journal (issue) | | 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 |  | | Journal (issue) | | Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe Two Treated-Color...of metamorphic origin (from localities such as Sri Lanka, Myanmar, Please see LETTERS, p. 226 Figure B...society, were Bahrain in the Persian Gulf, Ceylon (now Sri Lanlza), and Australia. Freshwater pearls came from...sapphires were coming from Kashmir (figure 71, Ceylon (Sri Lanlza), Australia, and the U.S. The American ' N...Gemstone Resources of China The Changma Diamond District, China Gemstone Carving in China: Winds ol Change |  | | Book | | chrysocolla, Majdanpek, Serbia ¢ tixex7 cm LEFT: Fluorite, Taihang Shan Mountains, Hebei, China * (Sexes...A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...be just a few crystals, as with celestine and fluorite, or the cavity may become lined with inwardly...they may have grown one after the other, as in fluorite growth on celestine. Delicate crystals can be...x 6 x 83cm Hardness 1 Hardness 4 Talc Fluorite Fluorite, Madoc, Ontario, Canada « 55 x 7x6cm MINERALS: |  | | Journal (issue) | | described the AE in chrysoberyl, garnet, corundum and fluorite. Bank and Henn (1988) mentioned that such colour...alexandrite, garnet, corundum, spinel, zircon, fluorite, kyanite and diaspore. Bernstein (1982) described...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 |  | | Journal (issue) | | not changed colour. The other stones are from Sri Lanka and are not treated; they weigh 9.85 ct (green)...mine, Kha district Looi mine, Kha district Looi mine, Kha district Looi mine, Kha district Notes Natural...mine, Kha district Finest. Only white after initial heating 6 7 Various, Champasak district Various...Champasak district 8 9 Various, Champasak district Pailin district 10 11 12 Looi mine, Kha district Looi...Looi mine, Kha district Various, Champasak district White stones after full heating Pre-heated to facilitate |  | | Journal (issue) | | from Guyana Surface Features of Ekanite from Sri Lanka A Study of Gems from Napoleon III’s Crown A New...EDITORIAL 137 Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More... Duncan...characteristics of ekanite from secondary deposits in Sri Lanka. 168 A Gemological and Spectroscopic Study with...“Boomerang” in topaz • Quarterly Crystal: Cinnabar in fluorite p. 226 234 Colored Stones Unearthed A look...0016-626X Diamonds from Guyana, Ekanite from Sri Lanka, a New Amber Source in Vietnam, and More... Welcome |  | | Book | | California, USA Foliated aggregates are found in Sri Lanka (Radegara, Galle region). Accumulations in Buckingham...\vith galena, pyrite, chalcopyrite, marcasite, fluorite, barite, quartz and other minerals. Beautiful...to 150 mm (6 in) long, associated with putple fluorite crystals, barite and calcite, occurred in Kadamdzhai...up to 30 mm ( P/16in) across, come from Hunan province, China_ Application: As ore. Gudmundite FeSbS...Norway; large crystals also occur in the Temiskaming district, Quebec, Canada; tabular crystals up to 120 mm |  | | Journal (issue) | | North-West Branch: R. Perrett, FGA South Yorkshire & District Branch: G. A. Massie, FGA Examiners: A. J. Allnutt...(Lond.), DIC, Ph.D. (Lond.), and S.I. Perera, (Sri Lanka), M.Phil. (Hong Kong) B.Sc. Ceylon Institute...Research, P.O. Box 787, Colombo, Sri Lanka. Abstract It is well known that Sri Lankan corundum with the milky...some corundum based stones (Gunaratne, 1981). Sri Lanka has large reserves of corundum stones showing...folkways in Sri Lanka M.M.M. Mahroof Colombo, Sri Lanka It is well known in gemmology that Sri Lanka* was |  | | Book | | 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;...chromite in peridot • olivine in diamond • pyrite in fluorite, sapphire and emerald • pyrrhotite in corundum...andalusite • sphene in ruby and spinel • uraninite in Sri Lanka sapphire • zircon in corundum. Apatite is a characteristic...and even hydrocarbons such as oil (e.g. in some fluorite from Illinois, USA). Among the large number of |  | | Book | | California. USA Foliated aggregates are found in Sri Lanka (Radegara, Galle region). Accumulations in Buckingham...with galena, pyrite. chalcopyrite, marcasite, fluorite. barite, quartz and other minerals. Beautiful...to 150 mm (6 in) long, associated with purple fluorite crystals, barite and calcite, occurred in Kadamdzhai...associated with pyrite, pyrrhotite, galena, sphalerite, fluorite, dolomite and calcite. Hydrothermal crystals and...crystals up to 30 mm (1V» in) across, come from Hunan province, China. Application: As ore. Gudmundite FeSbS |  | | Book (edition) | | simple twins Bustamite lamellar Rhodonite yes Fluorite polysynthetic Baddeleyite lamellar and complex...Descriptions Molybdenite in Graphite; Bogala Mine, Sri Lanka 51 Copper, native Synonym(s): Cuivre, Kupfer...internal reflections); Madenköy Mine, Çayeli, Rize Province, Black Sea Region, Turkey (sample: Halbach); XPL...grey; arg); Monte Narba Mine, San Vito, Cagliari Province, Sardinia, Italy; PPL B Same sample as above:...grey); Himmelsfürst Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Sachsen, Germany (sample: Seifert); |  | | Journal (issue) | | Franks, B.Sc., Ph.D., F.G.A. South Yorkshire & District Branch: J. L Platts, F.G.A. Examiners: E. A. Jobbins...emm., 1984. XIX, 3 SAPPHIRES FROM KANCHANABURI PROVINCE, THAILAND By MAHINDA GUNAWARDENE, F.G.A., D. Gem...An occurrence of sapphires in the Kanchanaburi province, Thailand, is dealt with here. Detailed descriptions...geological investigations of the Kanchanaburi province are reported and compared with the well-known...Figure 1. A sketch-map showing the Kanchanaburi Province and its surroundings. 14°00' J.Gemm., 1984 |  | | Journal (issue) | | from the the Kolonne Kolonne area, area, Sri Sri Lanka Lanka R. R. R. Harding* H arding* and E. Gamini...Gemmologist/Geologist, 91/4A Templars Road, Mount Lavinia, Sri Lanka Geological setting Gem sapphirine is being recovered...rocks of of 9 miles north-west of Embilipitya, Sri Lanka. The the Highland Series, a sequence of high-grade...more generally known in Sri More than 75% of the sapphirine fragments are Lanka. It has been reported by...in quality; the remainder are 1987 (from (from Sri Lanka), Kane 1987 (from (from Thailand), of variable |  | | Journal (issue) | | very important luminogen causing fluorescence of fluorite, apatite, and feldspars, are usually from 10-`...corundum, microcline, plagioclase, spodumene, fluorite, and spine) (with extrinsic luminescence). Let...inclusions. СgophоtolиmiпеsceRе (77К). Liaonin Province, China. Specimen: Yana Baa. (right) Photoluminescence...crystal (about З т т across) with vacuoles. Liaonin Province, China, Specimen: Yana Bao. (left) Laser luminescence...vacuoles and mineral inclusions (10'). Liaonin Province, China. Specimen: Boo Yana. (left) Luminescence |  | | Journal (issue) | | and from historical gemmology in Afghanistan, Sri Lanka or the UK to the criteria for distinguishing natural...the Chuncheon area, north east of Seoul, in the Province of Kangwondo, which is in the central part of...light, similar to those from Sri Lanka. The key difference between Burma and Sri Lankan sapphires is saturation...specimens are known, including a 40.3kg crystal from Sri Lanka which contains gemmy portions (see Table II)....Louis XIV. Said to be Bengal; probably Burma or Sri Lanka Date unknown Museum National D'Histoire Naturelle |  | | Journal (article/letter/editorial) | | granulite-facies coronitic gabbro from the Grenville Province, Ontario, Canada, magmatic baddeleyite and zircon...famous gem gravels from Rakwana, District of Kollonnagam, Ceylon (now Sri Lanka ). He donated one of these...identified in coarse gravel from the Balangoda gem district, Ceylon, several years later (Blake and Herbert-Smith...baddeleyite stones found in the gem gravels of Sri Lanka (Blake and Herbert-Smith, 1907) may also have...accessory minerals like apatite, magnetite, zircon and fluorite (Lumbers et al., 1990). Although detailed studies |  | | Journal (issue) | | beryl from Brazil • Magnetic corundum • Large pink fluorite from Pakistan • Crystals of color-change garnet...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 |
|
