 | | Journal (article/letter/editorial) | | Lincoln] at 19:55 09 April 2015 Apatite LOCALITIES Figure 1. Apatite, back row (from left) 7.06, 6.20...report on every locality that has ever produced apatite gemstones. 260 ROCKS & MINERALS Although no hard...localities are added where warranted. documented apatite gemstones in the GIA Museumās collection are recorded...about parcels of āgreenish blue to bluish greenā apatite they had observed at the Tucson Show that year...with the name ParaĆba, either labeled āParaĆba apatiteā or simply as āParaĆba.ā The same article (p. 161) |  | | 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 (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) | | Spinels of Mogok ā 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...spinel in marble shows the association with blue apatite (on the right side), Mahenge deposits, Tanzania |  | Giuliani, Gaston, Fallick, Anthony E., Boyce, Adrian J., Pardieu, Vincent, Pham, Van Long (2017) Pink and Red Spinels In Marble: Trace Elements, Oxygen Isotopes, and Sources. The Canadian Mineralogist, 55 (4) 743-761 doi:10.3749/canmin.1700009 | Journal (article/letter/editorial) | | Pardieu/GIA; (E) E. Gaillou/ENSMP. Badakshan Province in Afghanistan (Spencer 1937). In Roman times...countries and also at Ilakaka in Madagascar and Sri Lanka. Up until now, the mineralogical and physical...in the northern part of Myanmar, and also in Sri Lanka and Madagascar, for which the nature of the primary...from Kievlenko 2003). (A) Location of the mining district in Tajikistan. (B) Geological structure of the...calcite, dolomite, spinel, forsterite, clinohumite, apatite, margarite, pargasite, chlorite (sheridanite-clinochlore; |  | | Journal (article/letter/editorial) | | mineral inclusions in corundum from gem gravels in Sri Lanka A. A. DE MAESSCHALCK AND I. S. OEN Institute of...gem corundums from gravels of three areas in Sri Lanka. All fluid inclusions are pure CO 2. Microthermometry...corundum, fluid inclusions, gem gravels, Sri Lanka. Introduction SRI LANKA is famous for its gem corundum, which...Kumarapeli, 1960); in a pegmatite near Kolonn6, Ratnapura (Gunaratne, 1976); as an accessory mineral in...Embilimpitya area (4a, 4cd), and one from the Ratnapura area (10c) (Fig. 1). The Kataragama samples lb |  | | Journal (article/letter/editorial) | | they are the possiblesourcerock for many of the Ratnapura-type gem depositsin this area. The cordierite...sillimanite+ corundum q- sapphirine Fro. 1. The Ratnapura gem area (outlined) in relation to the occurrences...ubiqquitousaccessory mineralsand occasionally sparse amountsof apatite, spheneand graphite are also present. Sapphirinewasnotedas...portrayed in the SiO2-A12Oa-MgOtriangle (Fig. 2). Ratnapura-type Gem Deposits Most of the gem fields are...the southwest of the island centered around the Ratnapura valley (Wadia and Fernando,1945, p. 15) in the |  | | Report (chapter) | | quality and dental health in the Dry Zone of Sri Lanka C. B. D I S S A N A Y A K E Institute of Fundamental...Kandy, Sri Lanka (Present address: Department of Geology, University of Peradeniya, Peradeniya, Sri Lanka)...Lanka) Abstract: The Dry Zone of Sri Lanka has mostly poor rural folk, who live in very close association...parts of the Dry Zone notably in the North Central Province, have shown that the fluoride concentrations often...and geochemical environment is clearly seen in Sri Lanka with its varied topography, climate, soils and |  | | Journal (article/letter/editorial) | | 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...Largescale gem mining is confined mainly to the Ratnapura and Elahera areas (Fig. 1). In most local- ities...(Dahanayake et al., 1980). The gem-bearing beds in the Ratnapura area are mostly alluvial in origin and consist...1217 (1972a), the origin of the gemstonesof Sri Lanka has not been considered in any detail. It is the |  | | Journal (article/letter/editorial) | | in stream sediments of a granulite terrain in Sri Lanka ā evidence for a mineralized belt Rohana Chandrajith...Geology, UniĆersity of Peradeniya, Peradeniya, Sri Lanka Received 17 March 1999; accepted 11 May 2000 ...located in a high-grade metamorphic terrain of Sri Lanka have been analysed for their major and trace element...Stream sediment; Geochemistry; Walawe Ganga Basin; Sri Lanka 1. Introduction ) Corresponding author. Fax:...Faculty of Applied Sciences, Sabaragamuwa University of Sri Lanka, Buttala, Sri Lanka. The Walawe Ganga ŽGanga |  | | Journal (article/letter/editorial) | | of Sri Lanka K. Dahanayake Department of Geology, University of Peradeniya, Peradeniya, Sri Lanka The...The island of Sri Lanka is underlain primarily by Precambrian metamorphic rocks belonging to the Amphibole...cordierite gneisses, marbles and pegmatites. L'~le de Sri Lanka est formSe presque entiSrement des roches mStamorphiques...des pegmatites. INT ROD U CTION The island of Sri Lanka (formerly Ceylon) is underlain principally by...gneisses. The major gem fields of Sri Lanka Viz. Elahera and Ratnapura both lie in the Highland Group terrain |  | | Book | | Edelseifen um Ratnapura . . . . . . . . . . 22 Lageskizze der Edelsteinfelder in der Provinz Sabaragamuwa Ceylons...Polonnaruwa ā¢ Kandy Nuwara Eliya Adam's Peak Ratnapura ā¢ .Pelmadulla ā¢ Rakwana Malara Karte von Ceylon...altorientalisches Dichterwort die paradiesische Insel Lanka an der Siidspitze Indiens. Es hat bis heute seine...von Edelsteinen wie gerade Ceylon.Bereits in den Lanka-Sagen finden sich manche Hinweise auf Ceylons Edelsteinreichtum...ausser Gewiirzen auch Perlen und edle Steine aus Lanka, wie Ceylon im Altertum hiess, exportiert wiirden |  | | Journal (issue) | | 190 Gem Notes Adularia from Austria|Catās-eye apatite from Namibia|Colourchange axinite-(Mn) from Tanzania|Green...Gemmology, 34(3), 2014 Gem Notes Catās-eye Apatite from Namibia In March 2013, this author obtained...the āheliodorā was actually yellow apatite. There are several apatite localities in Namibia, but the origin...material is unknown. Cutting of the single chatoyant apatite yielded a 26.10 ct round cabochon measuring 15...(Figure 3). It is the best Namibian catās-eye apatite known to this author, with both a sharp eye and |  | | 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 fĆ¼r...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 |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, ThĆ©ogĆØne, Rakotosamizanany, Saholy, Razanatseheno, Marie, Offant, Yohann, Garnier, Virginie, Dunaigre, Christian, Schwarz, Dietmar, Mercier, Alain, Ratrimo, Voahangy, Ralison, Bruno (2007) Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin. Mineralium Deposita, 42 (3) 251-270 doi:10.1007/s00126-006-0105-3 | Journal (article/letter/editorial) | | Eastern Africa, India, and Sri Lanka is presented. Giant placer deposits from Sri Lanka, Madagascar, and Tanzania...gem corundum from Eastern Africa, India, and Sri Lanka is presented. Introduction For over 10 years...the main world producers of East Africa, India, Sri Lanka, Myanmar, Thailand, and Australia. Since 1993...from hand miners and exporting Malagasy rough to Sri Lanka and Thailand. The opportunity to establish the...central Madagascar and in the Ambohitra igneous province in the north, which includes the Nosy Be archipelago |  | Filina, Maria I., Sorokina, Elena S., Botcharnikov, Roman, Karampelas, Stefanos, Rassomakhin, Mikhail A., Kononkova, Natalia N., Nikolaev, Anatoly G., Berndt, Jasper, Hofmeister, Wolfgang (2019) Corundum Anorthosites-Kyshtymites from the South Urals, Russia: A Combined Mineralogical, Geochemical, and U-Pb Zircon Geochronological Study. Minerals, 9 (4) 234 doi:10.3390/min9040234 | Journal (article/letter/editorial) | | clinozoisite. Zircon, churchite-(Y), monazite-(Ce), and apatite group minerals are found as accessory phases. Besides...rhodonite was for Mn, TiO2 for for V, Cr2O3 for Cr, apatite for P,using galena SX 100 electron microprobe...TiO2 for Ti, vanadinite for V, Cr2 O3 for Cr, apatite for P, galena Minerals 2019, 9, 234 5 of 25...detectedasaszircon, zircon,churchite-(Y), churchite-(Y),apatite, apatite, and and monazite-(Ce) monazite-(Ce) (Figure...intergrowths with the monazite-(Ce) and likely apatite group minerals (Table S3). Zircon forms the matrix |  | | Journal (issue) | | 5 JANUARY 1977 KORNERUPINE CAT'S-EYES FROM SRI LANKA (CEYLON) By H. J. KOREVAAR, F.G.A., Ter Aar, Netherlands...year one of the authors (Korevaar), visiting Sri Lanka, bought a parcel of 125 cat's-eyes from a gem...originate from the Weligama gem gravels in the Matara district. Back in Holland, Korevaar contacted the Dutch...trip to Sri Lanka in February 1976, the authors noticed a lot of these stones in the Ratnapura Gem Museum...stones offered for sale by people in the street in Ratnapura. It is very likely, therefore, that in the near |  | Nasdala, Lutz, Corfu, Fernando, Blaimauer, Doris, Chanmuang, Chutimun, Ruschel, Katja, Å koda, Radek, Wildner, Manfred, Wirth, Richard, Zeug, Manuela, Zoysa, E. Gamini (2017) Neoproterozoic amorphous āekaniteā (Ca2Th0.9U0.1Si8O20) from Okkampitiya, Sri Lanka: A metamict gemstone with excellent lead-retention performance. Geology, 45 (10) 919-922 doi:10.1130/g39334.1 | Journal (article/letter/editorial) | | āekaniteā (Ca2Th0.9U0.1Si8O20) from Okkampitiya, Sri Lanka: A metamict gemstone with excellent leadretention...Company, No. 4, Gothami Mawatha, Mount Lavinia, Sri Lanka 1 2 ABSTRACT of a rather extreme example, the...Okkampitiya, eastern Sri Lanka, has a chemical āekaniteā from Okkampitiya, southeastern Sri composition of...corresponding to that of the tetragonal mineral ekanite. Lanka (quotes are used herein to indicate that The Okkampitiya...radiogenic Pb has been retained. The pura district, western Sri Lanka (Anderson et al., Okkampitiya āekaniteā |  | | Report (issue) | | 09 100.3 97.5 100.00 (1) Eheliyagoda district, Sri Lanka. (2) Tombstone Mountains, Canada; by electron...O20 : (3) Ca2 ThSi8 O20 : Occurrence: Detrital (Sri Lanka); in a glacial erratic syenitic boulder (Tombstone...Fluorite, garnet, quartz, microcline, clinopyroxene, apatite, sodic plagioclase, hematite, thorogummite, zircon...Eheliyagoda and Okkampitiya districts, near Ratnapura, Sri Lanka. In the Tombstone Mountains, Yukon Territory...mineral's discoverer, F.L.D. Ekanayake, of Colombo, Sri Lanka. Type Material: Canadian Geological Survey, Ottawa |  | | Journal (article/letter/editorial) | | Sediment Geochemistry of the Walawe Ganga Basin of Sri Lanka - Implications for Gondwana Mineralization Rohana...Geology, University of Peradeniya, Peradeniya, Sri Lanka * Corresponding Author (Manuscript received September...western-part of the Walawe Ganga (river) Basin in Sri Lanka is represented in this paper. The river basin...accessory mineral phases such as zircon, monazite, apatite, garnet and rutile in the sediments. In some samples...Walawe Ganga Basin, Sri Lanka. Introduction More than 90% of the island of Sri Lanka is made up of amphibolite |  | | 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...localities producing less-prominent gems (i.e., apatite, benitoite, charoite, chrome diopside, feldspar...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 |  | | Journal (issue) | | ......................................... 47 Sri Lanka ................................................Russia; Sant Enterprises, Thailand; Facets Show, Sri Lanka; Thai Gems and Jewelry Traders Association, Thailand;...Akira Ito, Japan SECRETARIES Ismail M. Kamil, Sri Lanka Jacqui Grande, USA DIRECTORS Andrew Cody, Australia...Namibia; Gamini Zoysa and Ismail Kamil, Colombo, Sri Lanka; TanzaniteOne Ltd.; South Africa; the Thai Gem...Masashi Furuya, Japan; Gem & Jewellery Authority of Sri Lanka; Jewellery Review Magazine, Russia; Prof. Mimi |  | | Journal (issue) | | Franks, B.Sc., Ph.D., F.G.A. South Yorkshire & District Branch: J. I. Platts, F.G.A. Examiners: A. J....of natural Tadparadschah ' sapphire found in Sri Lanka. However, a vast production of synthetic flux...'Padparadschah' sapphire Orange sapphire from Sri Lanka from Tanzania COMPARISON OF PHYSICAL PROPERTIES...Tadparadschah ' sapphires and orange sapphires of Sri Lankan and East African origins respectively and...Absorption spectrum of 'Padparaschah ' sapphire from Sri Lanka. (After Schmetzer et al., 1982) 800 I Cr3-+ |  | | Journal (issue) | | Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic...more about the age and origin of sapphires from two Sri Lankan alluvial deposits. Next, a team headed by...the 2017 news of sapphires from northern Tigray Province, prompted a 2018 GIA field expedition. Led by...willemite (Zn), albite (Na), sanidine (K), and apatite or fluor-phlogopite (F). Several well-characterized...minerals of the Southern California pegmatite province. Rocks & Minerals, Vol. 86, No. 1, pp. 14ā35, |  | | Report (issue) | | kyanite, staurolite (granite pegmatites); phenakite, apatite, tourmaline, fluorite (reaction zone pegmatites)...Abundant in gem gravel placers in the Ratnapura district, Sri Lanka. In the USA, from near Golden, Jefferson |
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