 | | Journal (article/letter/editorial) | | Geology and the origin of the corundum-bearing skarn at Bakamuna, Sri Lanka K. K. M. W. Silva and C. H....University of Peradeniya, Peradeniya, Sri Lanka Abstract. A corundum-bearing skarn deposit was discovered...three mineralogically different zones, and the corundum is chiefly mineralized in the outermost zone....fluids with A1, causing A120~ to precipitate as corundum. Sapphires and rubies form a wide spectrum of...of colored gemstones belonging to the corundum family, whose bulk composition is A1203 and are the main |  | | 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...main gem minerals that are mined at present are corundum, spinel, zircon and tourmaline. It was observed |  | 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) | | 3 ARTICLE Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological...Abstract The oxygen isotopic composition of gem corundum was measured from 22 deposits and occurrenEditorial...geological identification and characterization. Primary corundum deposits in Madagascar are hosted in magmatic...deposits, provoked in situ transformation of the corundum host rocks with the formation of metasomatites...marble from Andranondambo). The Ī“18O values for gem corundum from secondary deposits have a wide spread between |  | 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...Myanmar with the Mogok mining districts in the north central part of the country (Fig. 5). Spinel is occasionally...in the northern part of Myanmar, and also in Sri Lanka and Madagascar, for which the nature of the primary...Location of the mining district in Tajikistan. (B) Geological structure of the central part of the Kuh-i-Lal |  | | 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...Myanmar with the Mogok mining districts in the north-central part of the country. Spinel is occasionally |  | | Journal (article/letter/editorial) | | of needle-like rutile inclusions in natural gem corundum: A combined EPMA, LA-ICP-MS, and nanoSIMS investigation...chemistry and microscopic observations of included gem corundum (Ī±-Al2O3) suggests a new model of syngenetic growth...elements in gem-quality corundum (ruby and sapphire). Nonetheless, the corundum structure is relatively...Nb, Sn, La, Ce, Ta, and W are found in natural corundum. Their concentrations are typically correlated...contents of Ti and silky or cloudy zones in the corundum that contain a high concentration of needle-like |  | | Journal (article/letter/editorial) | | an importa nt feature of the Carnaib a de Baixo district accounti ng for a producti on of 135 tons between...Trecho Novo underground mines in the central part of the emerald district. In the Trecho Novo 167 mine, exploited...the Nova Era region. 61 @. OVERT'HRUSTlr.!G NORTH-SOUTH ( !40Ā°/160Ā°) ' s1 ā¢ Joā¢t:uoā¢ ~ N r.J\-...VIEIItTICAL SECTION PARALLEL 1'0LX ~ sā¢ā¢@ E ...--NoRTH "" EME:RALO MINERALI~ATION SITUATED ALONG Ā©... The origin of the pegmatites of Belmont mine district is more ambiguous. The pegmatites may be part |  | | 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) | | Abstract: The geographic origin of gem corundum has emerged as one of its major value factors...determination of corundum provenance. However, owing to similar properties and features of gem corundum from different...very low levels of many trace elements in gem corundum, the determination of geographic origin remains...linear discriminant analysis 1. Introduction Gem corundum, especially the red ruby and blue sapphire varieties...trying to identify the geographic origin of gem corundum Minerals 2020, 10, 447; doi:10.3390/min10050447 |  | | 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) | | industry today. FEATURE ARTICLES 464 Geology of Corundum and Emerald Gem Deposits: A Review Gaston Giuliani...our knowledge of the geology and genesis of gem corundum and emerald deposits. p. 569 512 A Review of...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 |  | | Book | | 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...studies, namely ruby, the red-colored gem variety of corundum. The color results from a sufļ¬ciency of the trace...Wang, K.; Tarantola, A.; Zaw, K.; Meffre, S. Gem corundum deposits of Greece: Geology, Mineralogy and Genesis...Grifļ¬n, W.L.; Saunders, M.; Toledo, V. Chromium in Corundum: Ultra-high Contents under Reducing Conditions |  | | 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...the diamond and jade deposits in the north, through the corundum deposits in the Mogok area (Figure 3)...he was asked to survey and report on the mining district by the concessionaires. The map he produced at...varying from 3 to 9 metres there is found a layer of corundum from a few centimetres to a few metres in thickness |  | | Journal (article/letter/editorial) | | doi:10.1111/j.1525-1314.2008.00779.x Petrology of corundum-spinel-sapphirine-anorthite rocks (sakenites)...ĆSakenitesĆ constitute a unique association of corundum-, spinel- and sapphirine-bearing anorthitic to...boudinaged bands and lenses, closely associated with corundum-, spinel- and sapphirine-bearing phlogopitites...Bongolava-Ranotsara shear zone. Bimineralic anorthite + corundum domains preserve the earliest record of a polyphasic...or coeval with the development of the anorthite-corundum assemblage. PāT pseudosection modelling of metapelitic |  | | 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...Sapphires-History, idenrification, value, etc. I.Title. 3. Corundum-History, identification, value, ere. 4. Precious...composition 48 The corundum suucture 48 Crystallography of corundum 50 Twinning in corundum 52 Morphology |  | | 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 (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 |  | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...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...minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...spinel minerals . . . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond |  | | Journal (issue) | | glass known as āfire obsidian,ā found only in central Oregon. The front cover features a 110.78 ct (41...trace element concentrations were recorded along a central transect (sample 17407124), nickel, lithium, beryllium...diffusion coefficient estimated for beryllium in corundum by NICKEL DIFFUSION OF SPINEL GEMS & GEMOLOGY...(D [m 2s ā1]) -7.2 -7.4 -7.6 -13 -14 Be in corundum (Emmett et al., 2003) -12 log10 (Dt [m 2]) ...minerals. A diffusion coefficient of beryllium in corundum estimated by Emmett et al. (2003) is also includedāthis |  | | Journal (article/letter/editorial) | | are common to the Hagendorf-Pleystein Pegmatite Province, SE Germany, and present in many ensialic orogens...Even rather exotic desilicified rocks such as corundum fels or marble horizons are known to give host...a rather conflicting view of this part of the Central European crust (Dill, 2018). Therefore some open...geodynamic situation of this crustal section in Central Europe has been given by Matte (2001), von Raumer...(2007) and Klemd (2010). The lithology of the Central European Variscan basement is rather complex covering |  | | 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...bronzite. In contrast, ring intrusions have a central body dunitic in composition (see Augustithis, 1965...attaining veinform character, consisting usually of central spinel and marginal ilmenite (Figs. 291 and 292)...patterns shown in Fig. 325. Fig. 325 shows sphalerite central zones free from ex-solutions and outer zones with |
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