 | | 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) | | 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) | | 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) | | 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) | | 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 |  | | Book | | extensive native plantations in the Northern Province, especially in the Jaffna Peninsula and the outlying...and December, the rainy season of the Northern Province. Sugar or “jaggery ” is prepared from sweet toddy...stone inthe Western Province, or of tamarind wood in the North-Central Province; in this a heavy pesile...to one family of ivory workers in the Kegalla District. The little figures of the last King of Kandy...Chief Priest are said to be contemporary portraits. Sri Wikrama Raja Sinha was the last king of the Suluwansa |  | 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) | | Sillimanite Al2 SiO5 ° c 2001 Mineral Data Publishing, ver sion 1.2 Crystal Data: Orthorhombic. Point...York. In the Okkampitiya, Ratnapura, Deniyaya, and Balangoda districts, Sri Lanka, as gem crystals. At Christmas |  | | Journal (issue) | | management in Sri Lanka P.G.R. Dharmaratne National Gem and Jewellery Authority, Colombo 3, Sri Lanka ABSTRACT:...accessing alluvial gem gravels (known as illama) in Sri Lanka for the extraction of gemstones, such as open...restoration of mined-out lands. The lessons learned by the Sri Lankan gem industry, with centuries of experience...the environment in which we live. Introduction Sri Lanka has been identified as one of the earliest sources...by sinking shafts and excavating tunnels. In Sri Lanka, only placer deposits are mined by sinking pits |  | | Journal (issue) | | 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 |  | | 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...minerals of the Southern California pegmatite province. Rocks & Minerals, Vol. 86, No. 1, pp. 14–35,...Brazil: the tourmalines of the Governador Valadares district. G&G, Vol. 21, No. 2, pp. 86–104, http://dx.doi |  | | 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) | | 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 |  | Voudouris, Panagiotis, Mavrogonatos, Constantinos, Graham, Ian, Giuliani, Gaston, Melfos, Vasilios, Karampelas, Stefanos, Karantoni, Vilelmini, Wang, Kandy, Tarantola, Alexandre, Zaw, Khin, Meffre, Sebastien, Klemme, Stephan, Berndt, Jasper, Heidrich, Stefanie, Zaccarini, Federica, Fallick, Anthony, Tsortanidis, Maria, Lampridis, Andreas (2019) Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis. Minerals, 9 (1) 49 doi:10.3390/min9010049 | Journal (article/letter/editorial) | | southern Madagascar, East Africa, South India and Sri Lanka; those related to the Himalayan orogeny mostly...zone III, 540–580 ◦ C to 620–660 ◦ C (kyanite-sillimanite transition) for zone IV, 620–660 ◦ C to 660–690...pegmatites penetrating the ultramafic bodies in the sillimanite stability zone, are desilicated and composed...dome-like core and thekyanite-sillimanite overlying kyanite-sillimanite grade andinmarbles the two plumasite...sapphires (e.g., Ilakaka/Madagascar and Ratnapura Balangoda/Sri Lanka), subparallel to the so-called Kashmir |  | | 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) | | weathered corundum-sillimanite rock collected from the Haputale escarpment near the Balangoda-Haputale road...of gems found in alluvial deposits of the Ratnapura district now runs to several million pounds, it is...the writer located the outcrop of the corundum-sillimanite rock described by Coomaraswamy, and also was...occurrences are now given. (a) The Corundum-sillimanite Rock. Loose blocks of this unusual rock were...crystals of corundum up to 2 cm. in diameter, and sillimanite in aggregates and idiomorphic crystals as much |  | | 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 (article/letter/editorial) | | Kandy, Sri Lanka and Department of Geology , University of Peradeniya, Peradeniya, Sri Lanka Received:...formation. Recent studies on the granulite terrain of Sri Lanka has clearly shown that it is only an upper crustal...the granulite belt of the Highland Complex of Sri Lanka where graphite is abundant possibly indicates...biospheric carbon into deep crustal regions. Sri Lanka provides an ideal case study for the following...carbon source. Diamonds have been reported in the Balangoda and Polonnaruwa areas . It is the aim of this |  | | Journal (issue) | | serpentinized harzburgite WSW of Hazarganji, Khuzdar District, SW Pakistan. The mineral occurs as acicular,...literature about heat treatment of geuda stones from Sri Lanka (e.g. Nassau, 1984; Ediriweera and Perera, 1989;...polymorph of cordierite), elongated striated rods of sillimanite and tiny parallelepipeds of probable feldspar...Keywords: Chile, inclusions, indialite, obsidian, sillimanite Introduction ransparent natural glasses, with...chemically, they have been identified identified as sillimanite by laser Raman methods (Koivula, pers.comm.) |  | | 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 | | A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...such as Porcupine and Hemlo districts; Noranda district, Quebec. USA: Mother Lode belt and others in...Localities Canada: Cobalt mining district and Thunder Bay District, Ontario. USA: several localities... Wire silver, Silver Islet Mine, Thunder Bay District, Ontario, Canada * 11.5 x 14x 11 om Silver has...xe2e0x Gem Copper, New Cornelia (Ajo) Mine, Ajo district, Arizona, USA 6 Keo lecm LEFT: Au (China, Eastern |  | | Journal (article/letter/editorial) | | State, India, form a part of the Eastern Ghats province of the charnockite region (Fermor, 1936) and are...essentially a potassium-feldspar-quartzgarnet-biotite sillimanite-gneiss with minor amounts of opaques, green spinel...alternating with others consisting of garnet, biotite, sillimanite, and opaques. Potassium feldspar shows moderate...India and Ceylon may be summarized as follows: Balangoda group of Ceylon (and probably of Travancore) 485...of detrital monazite from Satbhaya in Cuttack district (Orissa), by lead-uraniumthorium and by 2~176 |  | | Journal (article/letter/editorial) | | domains of sapphirine, garnet, orthopyroxene, sillimanite and cordierite. Inclusions of sapphirine-quartz...commonly rimmed by thick layers of prismatic sillimanite (sil). Cordierite (crd) formed as retrograde...contact with the restite domains (Fig. 4b). Sillimanite is less abundant, whereas the modal abundance...(qtz), magnetite (mt), rutile (rt), biotite, sillimanite as well as accessory monazite (mnz) and zircon...alkalifeldspar and quartz as well as rutile, sillimanite, biotite and accessory phases. Element Line |  | | Journal (issue) | | April2000 2000 April ' SriLankan Lankan 'f^ ^ < Sri gemdeposits deposits ; . gem LW NwwTN » ., GEPOL...Okkampitiya Okkampitiya gem gem field, field, Sri Sri Lanka Lanka 1 1 2 V. V.Mathavan Mathavan 1, , S.S.T....University University ofofPeradeniya, Peradeniya,Sri SriLanka Lanka 2.2.Institutfur Institut für Geowissenschaften...situated in in south-eastern south-eastern Sri Sri Lanka. Lanka. These These are are (1) (1) the the gem-bearing...deposit Introduction Introduction S riri Lanka, Lanka, well well known known for for its its wide |  | | Journal (issue) | | 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...deposits in the Isalo area of Madagascar, from Ratnapura, Sri Lanka and from Mogok, Myanmar, a nearly complete |
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