 | | Journal (article/letter/editorial) | | origin of the corundum-bearing skarn at Bakamuna, Sri Lanka K. K. M. W. Silva and C. H. E. R. Siriwardena...Geology, University of Peradeniya, Peradeniya, Sri Lanka Abstract. A corundum-bearing skarn deposit was...are the main and most precious gems produced by Sri Lanka. The in situ occurrence of corundum has been described...of charnockites. During recent field work at Bakamuna north of Elahera (Fig. 1) the authors discovered...discovery of such rocks in large occurrences in Sri Lanka, and it appears to be the main source of sapphires |  | | 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...of rubidium and strontium in the central granulite belt of Sri Lanka, where many of the gem deposits are...minerals that are mined at present are corundum, spinel, zircon and tourmaline. It was observed that higher |  | 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) | | the main productive and historical sources of gem spinel. Three consistent sets of d18O values were found...by combination with the O-isotope composition of spinel. The present study shows that it is possible to...and red spinel, trace elements, oxygen isotopes, geographic origin. INTRODUCTION Gem spinel belongs...belongs to the aluminous spinel subgroup A2Ć¾B3Ć¾2O4, where A represents Mg, Fe2Ć¾, Zn, Mn, Ni, Co, Cu, and Ge...sites of the crystal structure controls the color. Spinel offers a wide palette of colors (Fig. 1) extending |  | | Journal (issue) | | Summer 2019 Issue 43 All About Colored Gemstones Spinel In All Shades & Sparkling Colors A Publication...Jewelry Industry Special Spinel Pink and Red Gem Spinels in Marble and Placers Spinel from Tajikistan ā The...Spinels from Sri Lanka 54 The Spinels of Mahenge, Tanzania In Search of Cobalt Blue Spinel in Vietnam Spinel...Spinel Inclusions ā An Exercise in Aesthetics Spinel ā A Gemstone for Kings 66 InColor InColor is the...Responsibility 94 Book Review Discovering the Gems of Sri Lanka 98 100 108 113 Members 14 Saurabh Bansal Damien |  | 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) | | alkali basalt environments in the northern and central regions of Madagascar have consistent Ī“18O values...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 |  | | Journal (issue) | | Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe Two Treated-Color...Linda Kay Partney, Marathon, FL; Roy J. Pasini, North Olmsted, OH; Dipesh S. Pattni, Loughborough, Leicestershire...CA; John Stennett, Temple, TX; Clifford Steve, North Kingstown, RI; Clifford H. Stevens, Gansevoort,...of metamorphic origin (from localities such as Sri Lanka, Myanmar, Please see LETTERS, p. 226 Figure B...makes a particularly grand impression, while the central design offers hints of the exotic East. Photo courtesy |  | Krebs, Mandy, Hardman, Matthew, Pearson, David, Luo, Yan, Fagan, Andrew, Sarkar, Chiranjeeb (2020) An Evaluation of the Potential for Determination of the Geographic Origin of Ruby and Sapphire Using an Expanded Trace Element Suite Plus SrāPb Isotope Compositions. Minerals, 10 (5) 447 doi:10.3390/min10050447 | Journal (article/letter/editorial) | | and include (1) most deposits in Southeast and Central Asia (e.g., Myanmar, Vietnam, and Afghanistan)...others, for metamorphic or metasomatic rubies; (3) Sri Lanka, Myanmar, and Kashmir, as well as the more modern...to represent a deposit near Ampanihy, Toliara Province in southwestern Madagascar (George Harlow, pers...rubies, which contain mainly amphibole, garnet, and spinel inclusions [23,25ā28]; (3) The oxygen isotope (Ī“18...AD095 1ā5 : 1 Madagascar (MDG) Myanmar (MMR) Sri Lanka (LKA) Andilamena/Andrebabe (NE), 2 Ilakaka (S) |  | | Book | | Inclusions in Marble-Hosted Gem-Quality Ruby and SpinelfromMogok,Myanmar Reprinted from: Minerals 2020...WolfgangHofmeister PetrogenesisoftheSnezhnoeRubyDeposit,CentralPamir Reprinted from: Minerals 2020, 10, 478, doi:10...awarded a PhD in Geology at James Cook University of North Queensland in 1982. His research has focused on...ensemble in which ruby and sapphire associate with spinel and sapphirine in a highly calcic anorthosite-layered...new detailed UāPb dating on gem-quality ruby (and spinel) by using zircon and zirconolite inclusions in |  | | Journal (issue) | | clockwise from left: a 64.45 mm Sri Lankan sapphire crystal, a 24.34 ct Sri Lankan blue sapphire, two cuprian...mm pink-purple Sri Lankan sapphire crystal, a 10.90 ct Burmese ruby, and an 11.11 ct Sri Lankan alexandrite...blue sapphire was thought to exclusively indicate a Sri Lankan origin. Photo by Tino Hammid. trace elements...was long thought that this property pointed to a Sri Lankan origin. However, as more deposits were found...from.ā We know that some blue sapphires from Sri Lanka are almost identical to Burmese sapphires, and |  | | Journal (issue) | | Branch Chairmen: Midlands Branch: D.M. Larcher, North-West Branch: I. Knight Examiners: A. J. Allnutt...Alberta, Canada Fig. 1. The Kingdoms of Pagan in central Myanmar go back almost to the beginning of the...positions of the diamond and jade deposits in the north, through the corundum deposits in the Mogok area...the Black Prince's Ruby (actually an orange-red spinel) which can, with a reasonable degree of certainty...certainty, be dated back to 1367. This large spinel is set in the front of the Imperial State Crown. From its |  | | Journal (article/letter/editorial) | | 1111/j.1525-1314.2008.00779.x Petrology of corundum-spinel-sapphirine-anorthite rocks (sakenites) from the...ĆSakenitesĆ constitute a unique association of corundum-, spinel- and sapphirine-bearing anorthitic to phlogopitic...and lenses, closely associated with corundum-, spinel- and sapphirine-bearing phlogopitites, diverse...and Mg-Al minerals, thereby producing corundum-, spinel- and sapphirine-bearing phlogopitites. Further...complete replacement of corundum porphyroblasts by spinel, spinel + sapphirine or sapphirine, depending on the |  | | 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 Lankaās mining, cutting, jewelry manufacturing, and...colored stones. 228 Nephrite Jade from Guangxi Province, China Zuowei Yin, Cui Jiang, M. Santosh, Quanli...article in this issue examines the revitalization of Sri Lankaās gem and jewelry industry, achieved by combining |  | | Journal (issue) | | INSTITUTE OF AMERICA Nickel Diffusion Treatment of Spinel Gem-Quality Augite from Vietnam Color Origin of...VOLUME 59, No. 2 EDITORIAL 163 Nickel-Diffused Spinel, Vietnamese Augite, Brown Mammoth Ivory, and More...Pay FEATURE ARTICLES 164 Color Modification of Spinel by Nickel Diffusion: A New Treatment Michael Jollands...process for producing a deep blue color in natural spinel and proposes identification criteria. p. 180 ...glass known as āfire obsidian,ā found only in central Oregon. The front cover features a 110.78 ct (41 |  | | Journal (issue) | | Branch Chairmen: Midlands ā P Phillips, North East ā M Houghton, North West ā D M Brady, Scottish ā B Jackson...opportunity to visit a pearl farm belonging to North Bali Pearls in Penyabangan, which is part of PT...use Pinctada maxima, Figure 1: The pearl farm in North Bali, an aquacultural business with an ultra-modern...saibo). This is the practice followed at the farm in North Bali. Some of the grafted oysters expel this bead;...cultured pearls was centred on Broome and Darwin in north-western Australia. Problems persisted over a long |  | | Conference Proceedings | | Henry A. HƤnni, Switzerland; Mr. Gamini Zoysa, Sri Lanka; Dr. Karl Schmetzer, Germany; Prof. Dr. Emmanuel...(1979), Kashiko-Jima, Japan (1981), Beruwela, Sri Lanka (1983); Sydney, Australia (1985); Rio de Janeiro...Norway, Russia, Singapore, South Africa, Spain, Sri Lanka, Switzerland, Sweden, Tanzania, Thailand, U.S...Chen Yanyu, ArÅ«nas KleiÅ”mantas: Spinels from Sri-Lanka. 11 36 th IGC 2019 ā Nantes, France Co nference...Chanmuang N. , E. Gamini Zoysa : Ekanite from Sri-Lanka : what can we learn from a radioactive gemstone |  | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . . . . . . . ...of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals. . . ...corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel minerals . .... . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond . . . . . . | | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . . . . . . . ...of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals. . . ...corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel minerals . .... . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond . . . . . . |  | | Book | | pigeon's-blood rubies are pried from both soil and central government control. Marvel over India's maharajahs...finest star ruby on public display. A product of Sri Lanka's gem gravels, today it resides at the Smithsonian...origin is uncertain, but probably emanates from Sri Lanka. Today it rests in New York's Amer1can Museum...ndwns 465 Bibliography-Montana 469 North Caroli na 472 Bibl iography- North Carolina 472 Bibliography- O ther...473 History 474 Luc Yen 474 Quy Chau (Bu Khang District) 475 Other Vietnam corundu.n1 localities 478 Mining |  | | Book | | shales, hornfels and granites of the Harzburg district, showed that the amount of boron decreases from...continental crust, the "reverse overlap" of the north-western anorogenic granites upon the older granite...shows a graphic-like spinel surrounded by a crushed zone of bronzite. The spinel is also enriched marginally...as the crushed zone developed between the harder spinel and the softer bronzite (which, as pointed out...either obducted or diapiric mantle, the patterns of spinel intergrowth are comparable and commensurable. Therefore |
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