 | | Journal (article/letter/editorial) | | ratios to gem exploration in the granulite belt of Sri Lanka S.J.K. Gamage a, M.S. Rupasinghea and C.B. Dissanayake...Road, Kandy, Sri Lanka bDepartrnent of Geology, University of Peradeniya, Peradeniya, Sri Lanka (Received...ratios to gem exploration in the granulite belt of Sri Lanka. J. Geochem. Explor., 43:281-292. The geochemical...and strontium in the central granulite belt of Sri Lanka, where many of the gem deposits are found, was...exploration. INTRODUCTION The gem minerals of Sri Lanka have attracted the attention of mineralogists |  | | Journal (article/letter/editorial) | | BEDS OF SRI LANKA NAWARATNE Department of Geology,Universityof Peradeniya,Peradeniya,Sri Lanka Even...Even thoughthe occurrenceof gold in Sri Lanka has been mentioned in chronicles of historical im- portance...confirmedby the officersof the Mineral Surveyin the Sabaragamuwa, centraland western provinces(Ceylon Administration...p. 57), showsthe known occurrences of gold in Sri Lanka. The area under considerationis a very rugged...mountainous regionin the southeastern part of Ratnapura (Fig. 1). Figure 2 showsthe detailedgeology of |  | | 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 (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) | | they are the possiblesourcerock for many of the Ratnapura-type gem depositsin this area. The cordierite...cordierite+ biotite (3) cordierite+ sillimanite+ biotite (4) cordierite+ sillimanite+ garnet+ biotite (5) cordierite+...cordierite+ garnet+ biotite Notora (6) cordierite+ sillimanite+ andalusite + muscovite + biotite (7) cordierite+...hypersthene (8) cordierite+ sillimanite+ corundum q- sapphirine Fro. 1. The Ratnapura gem area (outlined) in...topography (hatched area--highlands). Corundum sillimanite rocks are marked by a cross. SiO2 Ilmenite-magnetite |  | | Journal (article/letter/editorial) | | processes. The charnockites of the Highland Group of Sri Lanka represent this type and show genetic relationships...aluminous metasediments such as those found in Sri Lanka result in the formation of an assemblage of gem...charnockitic parent. 1. I n t r o d u c t i o n Sri L a n k a is well k n o w n for its s e d i m e n...Department of Geology, University of Peradeniya, Sri Lanka. 0009-2541/85/$03.30 fore the source r o c k...d y o f the origin o f the g e m s t o n e s o f Sri L a n k a was m a d e b y Munasinghe and Diss a n |  | | Journal (article/letter/editorial) | | abundance in the sedimentary gem deposits of Sri Lanka M.S. RUPASINGHE and C.B. DISSANAYAKE* Institut...abundance in the sedimentary gem deposits of Sri Lanka. Lithos, 17: 329-342. This study reports some...elements) data from the gem-bearing sediments in Sri Lanka. The REE in these placer deposits are highly enriched...marked similarity with those for charnockites in Sri Lanka as well as for charnockite-granite rocks in other...the Highland Group in which all gem fields of Sri Lanka are found. The element pairs Zr-Hf, Zr-Ce, Zr-Ti |  | | 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 |  | 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...are intercalated generally with biotite-garnet-sillimanite or -kyanite gneisses, and granites (Fig. 5). |  | | Journal (issue) | | Laboratory', but many gemmologists make the journey to Sri Lanka or Thailand at least once in their lives, if not...collection is seen in Figure 18. It is a fibrolite (sillimanite), the identity of which has been confirmed by...and 360.8 nm. * ~ U Z < lXl ~ FIBROLITE [SILLIMANITE] ou: lXl < 0·0 3~0 * * We are fortunate...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 |  | | Journal (article/letter/editorial) | | Source Rocks of Gem Minerals A Case Study from Sri Lanka K. Dahanayake and A. P. Ranasinghe Department...Geology, Universityof Peradeniya, Peradeniya, Sri Lanka Field and laboratory studies on the geology and...tourmalines et zircons. INT RODUCTION The island of Sri Lanka consists mainly of Precambrian metamorphic rocks...northeastern coastal regions. The Precambrian of Sri Lanka has been divided into three major divisions by...Highland G r o u p - quartzites, marbles, garnet sillimanite gneisses, hornblende gneisses, charnockites, |  | | 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...Tannahena near Kandy; as violet tablets in corundum-sillimanite rock near the Haputale escarpment (Coomfirgtswamy...contact near Ohiya (Wells, 1956); in a biotite-sillimanite gneiss at Polgahawela (Cooray and Kumarapeli |  | Giuliani, Gaston, Fallick, Anthony, Rakotondrazafy, Michel, Ohnenstetter, Daniel, Andriamamonjy, Alfred, Ralantoarison, Théogène, 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 |  | Santosh, M., Katori, R., Yoshikura, S., Higash, S., Salim, A.K. (2002) Pink Sapphire from Southern Kerala, S. India: Implications on India-Madagascar Correlation Within Gondwana Assembly. Gondwana Research, 5 (4) 894-901 doi:10.1016/s1342-937x(05)70925-4 | Journal (article/letter/editorial) | | hues also occur in the Ratnapura gem district in the southwestern part of Sri Lanka. The pink sapphire occurrences...similar events recorded from adjacent terrains of Sri Lanka, Madagascar and East Antarctica within the East...emplaced within aluminous supracrustals (garnet+ sillimanite? graphite bearing granulites known as khondalites)...hosted within partly weathered garnet-biotite-sillimanite granulite (khondalite), and has a complex zoned...kaolinised. Garnet, biotite, tourmaline and sillimanite occur in some of these zones. The pegmatite has |  | | 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 (article/letter/editorial) | | in stream sediments of a granulite terrain in Sri Lanka — evidence for a mineralized belt Rohana Chandrajith...Geology, UniÕersity 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) | | Geological Maps of Sri Lanka 1:100000 The Geological Survey and Mines Bureau of Sri Lanka has started to...publish a series of 1:100000 geological maps of Sri Lanka. Seven maps are now available at a price of $10... 4, Senayake Building, Galle Road, Dehiwala, Sri Lanka: Sheet Sheet Sheet Sheet Sheet Sheet Sheet 8:...Attanagalla; 14: Kandy – Hanguranketta; 16: Colombo – Ratnapura; 17: Nuwara Eliya – Haputale. The set of maps...whole central and western part of Sri Lanka, i.e. most of the central Sri-Lankan Highlands and the western |  | | 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 |  | | Report (issue) | | calcite (metamorphosed limestones); kyanite, sillimanite, dumortierite, chlorite (schists); pyrope-rich...Chester, Hampden Co., Massachusetts; the Cortland district, Westchester Co., New York; at Franklin, Sussex...gems from: the Mogok district, Myanmar (Burma). In the Ratnapura district, Sri Lanka. Around Mysore, India...Sorobi, Laghman Province, Afghanistan. At Merkestein, near Longido, and the Morogoro district, Tanzania. From...Bottambang and Pailin, Cambodia. From the Zanskar district, Kashmir, India. In the Umba Valley, Tanzania |  | | Journal (issue) | | 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...2011. Recent finds at the Oceanview mine, Pala District, San Diego County, California. Rocks & Minerals |  | | 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...Walawe Ganga Basin, Sri Lanka. Introduction More than 90% of the island of Sri Lanka is made up of amphibolite...(1994) revised the subdivisions of Precambrian Sri Lanka based on the geochronological, petrological and |  | | 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-+ |  | Peucat, J.J., Ruffault, P., Fritsch, E., Bouhnik-Le Coz, M., Simonet, C., Lasnier, B. (2007) Ga/Mg ratio as a new geochemical tool to differentiate magmatic from metamorphic blue sapphires. Lithos, 98 (1) 261-274 doi:10.1016/j.lithos.2007.05.001 | Journal (article/letter/editorial) | | pastel) and in metamorphic terrains (e.g. Mogok, Sri Lanka, Ilakaka) are characterized by low average iron...(Cambodia) 12 — Ilakaka (S Madagascar) 13 — Ratnapura, Balangoda (Sri Lanka) 14 — Mogok (Myanmar) Metasomatic blue...(Cambodia) 12 — Ilakaka (S Madagascar) 13 — Ratnapura, Balangoda (Sri Lanka) 14 — Mogok (Myanmar) Metasomatic blue...My) originating in the Gulf of Guinea volcanic province (Wright et al., 1985; Scaratt and Harding, 1986)...part of the Panafrican orogenic belt known from Sri Lanka and Mozambique to Antarctica (Milisenda et al |  | | Report (issue) | | tourmaline, grandidierite, dumortierite, kyanite, sillimanite, andalusite, biotite, phlogopite, magnetite,...Tanzania. On the Bok se Puts Farm, Namaqualand, Cape Province, South Africa. Gem crystals from Itrongahy, near...gem gravels of the Matale, Ratnapura, and Embilipitiya districts, Sri Lanka. In the Harts and Strangways |  | | Report (issue) | | chondrodite, scapolite, phlogopite, corundum, sillimanite, andalusite. Distribution: Many localities. Some...around Mogok, Myanmar (Burma) and in Sri Lanka, in the Ratnapura and Elahera districts, and elsewhere... Ontario, and Wakefield, Quebec. In the Eifel district, and at Bodenmais, Bavaria, Germany. On Monte |
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Ratnapura, Ratnapura District, Sabaragamuwa Province, Sri Lanka