 | | Journal (article/letter/editorial) | | Deformation of a High-Grade Gondwana Fragment, Sri Lanka K.V. Wilbert Kehelpannala Department of Earth... Hantana Road, Kandy, Sri Lanka (Manuscript accepted June 6, 1997) Abstract The Sri Lankan Gondwana...recognized in the smallest Gondwana fragment, Sri Lanka. There is microscopic and mesoscopic evidence...(F,), which control the present map pattern of Sri Lanka. The superimposition of D, folds on D, folds gave...It is argued that the WC, the HC and the VC in Sri Lanka may be three distinctly different Proterozoic |  | | Journal (issue) | | Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: M. W. Eldridge, M.B., Ch.B., F.G.A. Examiners:...is best known from the occurrence in the Dundas district of Tasmania, where it attains lengths of up to...crocoite was from the Sverdlovsk area, Beresov district, in the Ural Mountains of the U.S.S.R.; in 1797...strong with colours reddish-blue, violet blue and rose-red. A certain amount of luminescence has been observed;...form the country rock to pegmatites and late-phase quartz veins intruded at various times before and after |  | | 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 (issue) | | ......................................... 47 Sri Lanka ................................................Russia; Sant Enterprises, Thailand; Facets Show, Sri Lanka; Thai Gems and Jewelry Traders Association, Thailand;...Akira Ito, Japan SECRETARIES Ismail M. Kamil, Sri Lanka Jacqui Grande, USA DIRECTORS Andrew Cody, Australia...Namibia; Gamini Zoysa and Ismail Kamil, Colombo, Sri Lanka; TanzaniteOne Ltd.; South Africa; the Thai Gem...Masashi Furuya, Japan; Gem & Jewellery Authority of Sri Lanka; Jewellery Review Magazine, Russia; Prof. Mimi |  | | Book | | Enterprise as carried on, chiefiy in the Sabaragamuwa district; to the splendid opportunity presented for the...round off the list of precious things for which Lanka and Serendib have been famous from time immemorial...Corundum ... ... 30, 98, 123, 140 Cost of Crushing Quartz . 5 Cost of Labour . 8 Cradle tor Washing Gold...to Minerals . 68 Crushing Gold 65, 158 Crushing Quartz, Cost of .. *•• o Crystal .. 29, 30, 96 Cupellation.... ... ... 5 Machinery for Treating .Auriferous Quartz .. ... ... ... 157 MacVicar, Dr. ... ... 30, 32 |  | | Journal (issue) | | Prospectors' Guide Map to the Gem Deposits of Sri Lanka C. B. Dissanayuke and M.S . Rupasinghe Two Treated-Color...York, PA; Richard P. Ellis, Missoula, MT; Sandra Rose Engeberg, Los Angeles, CA; Frank Ernst, Scottsdale...MI; Suzanne Rizzo, Commerce Twp., MI ; Charles L. Rose, Germantown, TN; Aimee Roseberry, West Des Moines...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 |  | | Book | | Sri Lanka's mineral resources can enrich country's coffers Prashan Francis B.Sc. Special (Geo.,SL)...Gem &Jewellery Research & Training Institute, Sri Lanka (Ministry of Mahaweli Development and Environment)...Jewellery Research & Training Institute, Sri Lanka 2018 Sri Lanka's mineral resources can enrich country's...Gem & Jewellery Research & Training Institute, Sri Lanka All rights reserved. No part of this publication...Sutharshan 2018. ISBN 978-955-8382-04-2 Preface Sri Lanka is gifted with many varieties of high quality |  | | Journal (issue) | | the Precambrian. The major structural units of central and southern Africa can be subdivided into two...tremolite-chlorite schists, hornblende schists, phyllites and quartz-mica schists. Specific higher-temperature exceptions...Distribution of the Precambrian geotectonic units in central and southern southern Africa. Africa. high pressure... and (2) alkali feldspar + talc = phlogopite + quartz, while the appearance of biotite instead of, or...the serpentinites of the Zvishavana (Shabani) district. Thereafter, the journey has to be continued over |  | | Journal (issue) | | North-West Branch: R. Perrett, FGA South Yorkshire & District Branch: G. A. Massie, FGA Examiners: A. J. Allnutt...some natural rubies can have similar behaviours (Sri Lanka, Burma, Africa), it was decided to try and obtain...angle in in natural natural rub rubyy from from Sri Sri Lanka viewed viewed in in a angle direction parallel...be placed over the light to 2. Heat treatment in Sri Lankan yellow to orange provide diffusion. diffusion...immersion cell. One by one I tried from four sources: Sri Lanka, Thailand, Australia them: red, green, yellow |  | | Catalog/List | | slightly iron stained greyish druse of micro xtlline quartz, dusted with a little fibrous white selenite.Excellent...Penberthy Croft.St Hilary.Matrix of altered kilas,quartz & clay with many vughs lined with grey lathe like...ofbright green hnm prismatic xtls, totally enveloping quartz xtls. Good D. C. £15 = - -=~:- "' ·" 8) HA:RM6TOME...14) SMOKY QUARTZ,Goschener Alp,Switzerland.Somewhat tabular tenninated glassy smoky quartz. Good shape...Matrix free.Good RF miniatures.£5 18) SAPPHIRE,Kandy,Ceylon.13 attractive bluish mauve hexagonal corundum |  | | 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) | | from from the rhyolite matrix, are often trapped. Quartz, goethite and even two- and three-phase inclusions...Laboratory', but many gemmologists make the journey to Sri Lanka or Thailand at least once in their lives, if not...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...are located in the Uva region, in the Ratnapura district and in the Tissamaharma area (Dunn, 1977 and Zwaan |  | | Journal (issue) | | varieties including chromian and vanadian), smoky quartz, sphene (?) and both clino- and ortho-pyroxenes...cobalt or zinc (both of which we have found in Sri Lanka blue colour-change spinels) have some effect....south side of the Mweza Greenstone Belt, Belingwe District, 5.2 km west-southwest of the confluence of the...hexagonal prisms in pegmatites, aplites, quartz stringers, quartz-feldspar and feldspar veins and as deep...The deposit then consists of thin pegmatite or quartz veins and lenses surrounded by black micaceous |  | | Journal (issue) | | Ltd., Lucerne, Switzerland; Hiroshi Kitawaki, Central Gem Laboratory, Tokyo, Japan; Michael S. Krzemnicki...(Figure 4b), spessartine (Figure 4c), almandine, quartz, zircon, apatite, topaz, sillimanite, fluorite...minerals. The mining area is situated in the Kyaukme District of northern Shan State, approximately 18 km southeast...Mong Long area is located south-east of Mogok, in central Myanmar. Ayeyarwady (Irrawaddy) River Momeik...tourmaline (Figure 4d), aquamarine, spessartine, quartz, topaz, zircon and phenakite are mined. Tourmaline |  | | Journal (issue) | | however, the arms extend outward from a hexagonal central core, producing six trapezohedral ruby areas. The...usually opaque yellow or black, but transparent red central areas are also present occasionally. In the yellow...fixed six-rayed stars intersect in a small central central point (a,b) (a,b) or orextend extendoutward...six sharp arms of the star with yellowish-white central parts and stronger yellow outer parts (Figure le)...yellowish-white arms of the sample intersect at one small central point. Figure 5: Element distribution maps for |  | | Journal (issue) | | Protected Area of the Lufwanyama district in the Copperbelt Province of Zambia. The Ndola region consists...Ministry of Mines and Minerals Development, 2006) with quartz and tourmaline commonly precipitated first in the...The Santa Terezinha-Campos Verdes emerald district, central Brazil: structural and Sm-Nd data to constrain...rare, similar spinels are known from Tanzania, Sri Lanka and Madagascar (e.g. see Modern Jeweler). The...mined from primary and secondary deposits in Sri Lanka, Myanmar (Mogok and Namya), Vietnam (Luc Yen area) |  | | Book | | brilliant, carats. 30 Kandy, Ceylon. Morgan Gift DIAMOND A rose cut drop pendant, 25 carats...Mountains, Russia. Morgan brilliant, 30^4 carats. Kandy, Ceylon. Morgan Gift Gift CAN OPAL A cushion-shaped...engraved on edge, 29 T7 3 carats. 66 carats. Kandy, Ceylon. Morgan Gift Lightning Ridge, Facetted...step-cut stone, Gift New Mexico 9 3/4 carats. Kandy, Ceylon. Morgan Gift TURO' A A cabochon cut...cymophane, 47^4 carats. One of gems the world. Kandy, Ceylon. 4754 carats. Lake Baikal, the finest |  | | Journal (issue) | | of black lined surface-reaching fractures and a central inclusion (Figure 18). Following the treatment...were found to be quartz, whilst the upper main body was found to be glass. The quartz sections had refractive...number of the topics discus- Fig. 21. A 30cm high quartz ewer in which the upper part of the main body was...crystals were found together with large amounts of rose quartz in a kaolinized pegmatite at Tongafeno, near...emeralds are colour zoning (almost colourless central area with a green rim); systems of almost parallel-running |  | | Journal (issue) | | of black lined surface-reaching fractures and a central inclusion (Figure 18). Following the treatment...were found to be quartz, whilst the upper main body was found to be glass. The quartz sections had refractive...number of the topics discus- Fig. 21. A 30cm high quartz ewer in which the upper part of the main body was...crystals were found together with large amounts of rose quartz in a kaolinized pegmatite at Tongafeno, near...emeralds are colour zoning (almost colourless central area with a green rim); systems of almost parallel-running |  | | Journal (issue) | | North-West Branch: R. Perrett, FGA South Yorkshire & District Branch: G. A. Massie, FGA Examiners: A. J. Allnutt...farm in China. Pearl Farming in Yangxin, Hubei Province, China During May 1989 the authors visited China...orientation along the edges of rhombic dodecafound in Sri Lanka (Webster, 1983), which has been hedral faces (Figure...layered structure parallel to the table facet with a central seed (layer I) and two symmetrically arranged layers...are not symmetrically arranged above and below a central seed. 25x. 22 22 J. Gemm., 1990, 1990,22,1 22 |  | | Journal (issue) | | materials, although some have been seen in synthetic quartz after chemical etching (Iwasaki, 1977). Because...1977. Line defects and etch tunnels in synthetic quartz. Journal of Crystal Growth, 39, 291-8 Koivula,...corindos p a r spectrométrie infra-rouge. Dossier central (suite). Revue de Gemmology, 141/142, 27-31 Gübelin...petals are arranged in two groups. Relative to the central plane, three petals radiate upward, and the other...management in Sri Lanka P.G.R. Dharmaratne National Gem and Jewellery Authority, Colombo 3, Sri Lanka ABSTRACT: |  | | Journal (issue) | | treatment (KM treatment) of diamonds Y. Horikawa Central Gem Laboratory, Tokyo, Japan ABSTRACT: A new technique...samples and for other information. Nobuo Horiuchi of Central Gem Laboratory provided useful suggestions and...Teramae, Hirata and Soeda, colleagues of mine at Central Gem Laboratory, are thanked for their support....pearl farm (Figure 1) was one of a number in the province belonging to one company. The freshwater mussels...radiograph of a drop pearl (Figure 13) reveals an even central area where a urea formaldehyde resin had been used |  | | Journal (issue) | | and alluvial deposits from the Barrington basalt province in New South Wales, one typical of East Australian...1996; Guo Guo etet al., al, 1996), the Barrington province also yields an abundant pastel-coloured sapphire-ruby...main drainages, Barrington Figure 1: Distribution province, 250 of of Sydney, New South Wales. Corundum/zircon...Corundum/zircon suites suites are marked by inclined province, 250kmkmnorth north Sydney, New South Wales. Corundum/zircon...areas) and drainages, Pailin district, Figure 2: Distribution district, continuous lines, with with gem-barren |  | | Journal (issue) | | South America (Brazil and Colombia), central and southern Asia (Sri Lanka, India, Afghanistan, Pakistan, Russia...The major sources for diamonds were Australia, central and southern Africa (Botswana, South Africa, Namibia...jade [both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and tourmaline). Locality...come from a number of sources, but predominantly Sri Lanka. Accented with smaller diamonds, the 129 gem corundums...They built fires under massive aquamarine-bearing quartz bodies, and then threw water onto the heated rock |  | | 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...Myanmar with the Mogok mining districts in the north-central part of the country. Spinel is occasionally extracted |
|
