 | | Report (chapter) | | specimens Geikielite, MgTiO3, is a member of the ilmenite– geikielite series and is the Ti analogue of alkimotoite...alkimotoite, MgSiO3. The mineral also belongs to the ilmenite group (Bowles et al. 2011; Back 2018). Basic mineralogical...in the Ratnapura (Sinhalese: ‘city of gems’) District, in the Sabaragamuwa Province of Sir Lanka (formerly...is Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka, a gem-mining district (Back 2018).... Sabaragamuwa Province in Sri Lanka is, in fact, the centre of gem mining in Sri Lanka. Archean high-grade |  | | Journal (article/letter/editorial) | | COMMUNICATIONS IN THE GEM C. B. DISSANAYAKE AND S. W. 788 BEDS OF SRI LANKA NAWARATNE Department...Peradeniya,Peradeniya,Sri Lanka Even thoughthe occurrenceof gold in Sri Lanka has been mentioned in...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) | | are the possiblesourcerock for many of the Ratnapura-type gem depositsin this area. The cordierite gneissesand...termed by Cooray (1962, p. 257) the "Southwest GEM CEYLON rocksalso belongto this paragenesis, but...sillimanite+ corundum q- sapphirine Fro. 1. The Ratnapura gem area (outlined) in relation to the occurrences...sillimanite rocks are marked by a cross. SiO2 Ilmenite-magnetite, spinel,and zircon are ubiqquitousaccessory...comparablerocksof Ceylon,althoughit is foundin the gem gravels. Most of the mineralassemblages listedabovewere |  | | 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) | | 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...topaz, and zircon. Largescale gem mining is confined mainly to the Ratnapura and Elahera areas (Fig. 1)...1). In most local- ities gem minerals are recovered from residual, alluvial, and eluvial depositsthough...common (Dahanayake et al., 1980). The gem-bearing beds in the Ratnapura area are mostly alluvial in origin |  | | Journal (article/letter/editorial) | | Geochemistry of Beryllium and Fluorine in the Gem Fields of Sri Lanka M. S. Rupasinghe 1, A. Banerjee 1, j. Pense...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...charnockitic rocks abundant in the main gem bearing areas of Sri Lanka. Fluorine is found in the range of |  | | Journal (issue) | | inclusions or these cannot be seen because the host gem is too opaque. The brownish opal termed hyalite,...KennethScarratt, Kenneth Scarratt, F.G.A. F.G.A. The Gem Gem Testing Testing Laboratory Laboratory of of Great...Laboratory's name that has changed, firstly from 'The Gem Testing Laboratory of the London Chamber of of Commerce...Commerce and Industry' and then to 'The British Gem Testing Laboratory of the London Chamber ofCommerce...The The Laboratory Laboratory is now known as 'The Gem Testing Laboratory of of Great Britain'.. Britain' |  | | Report (issue) | | sillimanite, andalusite, biotite, phlogopite, magnetite, ilmenite, hematite, rutile. Distribution: Some localities...Bok se Puts Farm, Namaqualand, Cape Province, South Africa. Gem crystals from Itrongahy, near Betroka...Madagascar. From gem gravels of the Matale, Ratnapura, and Embilipitiya districts, Sri Lanka. In the Harts |  | | Book | | Concentrated by Surface Waters: 1 5 The Gem Gravels of Sri Lanka 2. Gemstones Formed from Surface Water:...Gemstones of Igneous-Hydrothermal Origin 3. Hydrothermal Gem Deposits: 35 39 The Emerald Deposits of Colombia...Colombia 4. Gemstones Formed in Pegmatites: 57 Gem Pegmatites of Minas Gerais, Brazil 5. Gemstones Formed...Gemstones Formed at Great Depths 8. Mantle Thrust Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot... Western Australia Index 141 FOREWORD Each gem deposit-whether of primary origin in the parent rocks; | | | Book | | Concentrated by Surface Waters: 1 5 The Gem Gravels of Sri Lanka 2. Gemstones Formed from Surface Water:...Gemstones of Igneous-Hydrothermal Origin 3. Hydrothermal Gem Deposits: 35 39 The Emerald Deposits of Colombia...Colombia 4. Gemstones Formed in Pegmatites: 57 Gem Pegmatites of Minas Gerais, Brazil 5. Gemstones Formed...Gemstones Formed at Great Depths 8. Mantle Thrust Sheet Gem Deposits: 115 119 The Zabargad Island, Egypt, Peridot... Western Australia Index 141 FOREWORD Each gem deposit-whether of primary origin in the parent rocks; |  | | 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 (article/letter/editorial) | | peculiar vein-dikes of the Grenville Geologic Province, Canada. Gem zircon and associated corundum occur in...sheet mica pegmatite mines of the Spruce Pine district, Mitchell and Yancey counties. Relatively productive...approximately 3-cm zircon crystal on matrix from Sri Lanka. Rob Lavinsky specimen and photo. Figure 9. A...pale tan zircon crystals from Mount Malosa, Zomba district, Malawi. Lino Caserini specimen, Jeff Scovil photo...giant crystals, include titanite, fluorapatite, ilmenite, nepheline, scapolite, and the feldspars, pyroxenes |  | | Journal (article/letter/editorial) | | A DAY IN A CEYLON GEM FIELD Delaware' Josoru L. GrlrsoN, Wilmi'ngton, In March, 1932, having two free...arrangementsto quickly visit Ratnapura, 55 miles southeast of Colombo, the center of the gem-washing injourney in...to show me the promised who found was guide a Ratnapura, and in operation durstill were that places) (washing...idamas daYs. these depression ing-ttrat the -eylo.t gem fields have been known for a very long time is indicated...plagiarizes the tale in a more interesting manner'"1 Ratnapura (a Singhalese word meaning "City of Gems") is |  | | Journal (issue) | | JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA Sri Lanka: Where Tradition and Technology Meet Characteristics...Tomorrow 173 Duncan Pay FEATURE ARTICLES 174 Sri Lanka: Expedition to the Island of Jewels Andrew Lucas...Pedro Padua pg. 175 Offers a firsthand look at Sri Lanka’s mining, cutting, jewelry manufacturing, and...colored stones. 228 Nephrite Jade from Guangxi Province, China Zuowei Yin, Cui Jiang, M. Santosh, Quanli...with flux synthetic ruby overgrowth pg. 243 244 Gem News International Aquamarine with unusually strong |  | | 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 |  | | Journal (issue) | | invite you to be our guest at Hong Kong Jewellery & Gem Fair September 16th-20th 2019 AWE - Booth 8E03 German...Spinel Pink and Red Gem Spinels in Marble and Placers Spinel from Tajikistan – The Gem That Made Famous...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 |  | | 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-+ |  | | Book | | assemblage such as the zeolites from India, or high gem quality such as the rubies from Burma, or some significantly...notable example in this category is the Nuristan District of Afghanistan, which over the past 10 years has...has produced some of the most extraordinary gem minerals ever found. The majority of this volume is based...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, |  | Dushyantha, Nimila, Ilankoon, I. M. Saman K., Ratnayake, N. P., Premasiri, H. M. R., Dharmaratne, P. G. R., Abeysinghe, A. M. K. B., Rohitha, L. P. S., Chandrajith, Rohana, Ratnayake, A. S., Dissanayake, D. M. D. O. K., Batapola, N. M. (2022) Recovery Potential of Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management. Minerals, 12 (11) 1411 doi:10.3390/min12111411 | Journal (article/letter/editorial) | | Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management...Rare Earth Elements (REEs) from the Gem Mining Waste of Sri Lanka: A Case Study for Mine Waste Management...Engineering, University of Moratuwa, Moratuwa 10400, Sri Lanka Department of Applied Earth Sciences, Faculty...Wellassa University, Passaara Road, Badulla 90000, Sri Lanka Discipline of Chemical Engineering, School of... University of Peradeniya, Peradeniya 20400, Sri Lanka Correspondence: nimila.dush@gmail.com (N.D.); |  | | Journal (issue) | | Australia: Canadian Gemmological Association: Rhodesian Gem and Mineral Society. THE JOURNAL OF GEMMOLOGY A...BRITAIN Vol. X I V N o . 8 O C T O B E R 1975 ON GEM ELBAITE FROM NEWRY, MAINE, U.S.A. By PETE J. DUNN...significant find of gem quality elbaite (lithium tourmaline) was made at the Dunton gem mine, Newry, Maine...facet-grade. Some gem pockets had been found in recent years, but the yield of gem material was small...however, and only serves to give the beautiful red gem material a crackled green coat! The thin outer green |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: 1. R. M. Lewis, F.G.A. Examiners: B. W...many others, I owe all such knowledge of gems and gem materials as I possess—apart, in my case, from such...matters more complicated the actual weights used by gem merchants with their balances were numbered 1000...appeared in the early years of the century are The Gem Cutter's Craft by L. Claremont (London, 1906), which...was my standby when I first started work in the Gem Testing Laboratory, but one had to wait until 1940 |  | | Journal (issue) | | Tribute to Robert M. Shipley, Jr. The Chanthaburi-Trat Gem Field, Thailand Peter C. Keller 197 Gemstones with...Alexandrite Effect E. Giibelin and K. Schmetzer 204 Gem-Quality Grossular Garnets D. Vincent Manson and Carol...Crystal: The Van Pelt Collection John Sinkankcis 221 Gem-Quality Friedelite from the Kalahari Manganese Field...REGULAR FEATURES Gem Trade Lab Notes Editorial Forum Gemological Abstracts Book Reviews Gem News Index to...Liddicoat, Jr. Associate Editor Peter C. Keller Editor, Gem Trade Lab Notes Chuck Fryer Editor, Gemological Abstracts |  | | Journal (issue) | | Colombian Emeralds Ron Ringsmd The Elahera Gem Field in Central Sri Lanka Mahinda Gunawardene and Mahinda S....Nassau REGULAR FEATURES Editorial Forum Gem Trade Lab Notes Gem News Gemological Abstracts Book Reviews...LaFayette, Indiana Sallie Morton San lose, CA Editor, Gem Trade Lab Notes C . W. Fryer Editor, Gemological...Jeffrey M. Burbank Contributing Editor and Editor, Gem News John I. Koivula Production Assistant Patricia...COLOMBIAN EMERALDS By Ron Ringsrud The Muzo emerald district, i n Boyacd, Colombia, contains several mines |  | | Book | | Dimensions in the captions refer to the entire gem or mineral; however, in some cases only a portion...A CHANGING PLANET 11 Vanadinite, San Carlos district, Chihuahua, Mexico * 8 x 4 x 2 cm Mineral Species...can be as valuable as the richly colored stones. Gem cutters bring out the inner beauty of gems by creating...trick with light. Facets allow light to enter the gem; once inside, the light bounces off its other angled...Africa and Canada « 2.00 ct and 3.06 ct leaves the gem, similar to what happens when you pass light through |  | | Journal (issue) | | FEATURE ARTICLES 2 A New Method for Determining Gem Tourmaline Species by LA-ICP-MS Ziyin Sun, Aaron...a simplified but comprehensive classification of gem tourmaline species based on quantitative measurement...Zircon Inclusions in Sapphires from Ratnapura and Balangoda (Sri Lanka) and Implications for Geographic...sapphire • Quarterly Crystal: Orpiment in barite 118 Gem News International Tucson 2019 • Boulder opal mining...Responsibly sourced gemstones • The Chinese and Japanese gem markets • Unusual and vibrant gems • Jeff Hapeman |
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