 | | Journal (article/letter/editorial) | | granitic pegmatites in Zambia, Madagascar, Russia, Mozambique, the United States, Nepal, and the Democratic...âfluor-elbaiteâ. Though rare, yellow rossmanite and âfluor-rossmaniteâ from Mozambique also occur. Overall, the MnO...form. Its presence implies that the original pegmatite-forming melt must be relatively low in Fe and...late stages of pegmatite formation to crystallize yellow elbaite, âfluor-elbaiteâ, rossmanite or âfluor-rossmaniteâ...âfluor-rossmaniteâ. Keywords: yellow elbaite, Mn-rich tourmaline, âtsilaisiteâ, âfluor-rossmaniteâ. Sommaire |  | | Journal (article/letter/editorial) | | tourmaline, gemstone, ParaĂba-type, chromophores, gem deposits TOURMALINE AS A GEMSTONE Perhaps more than any...the late 18th century the discovery of rubellite deposits near Nerchinsk, Siberia, and the fi nds of Brazilian...FIGURE 2 FIGURE 3 Pendant consisting of two Mozambique copperbearing tourmalines (10.95 ct pink and...Elbaite, âfluor-elbaite,â fluor-liddicoatite, rossmanite Pink and red Rubellite Mn3+ (c), Mn3+ + Fe...Elbaite, âfluor-elbaite,â fluor-liddicoatite, rossmanite Yellow, yellow-green Canary Mn 2+ (d), Mn |  | | Report (issue) | | Amerika in Saxony A Survey of the World's Tourmaline Deposits Africa ............................73 Asia .....tourmaline is not generally found in easy to work alluvial deposits as were the ancient gems. In fact, almost...(1989), foitite by MacDonald et al. (1993) and rossmanite by Selway et al. (1998). It was only a matter... povondraite, liddicoatite, uvite, feruvite, rossmanite, foitite, magnesiofoitite and vanadiumdravite...strata-bound sulfide deposits and in association with volcanic and sedimentary gold deposits. Tourmaline can |  | | Journal (issue) | | Brazil and is reliably reported to come from a pegmatite in Minas Gerais. The base is tourmaline with a...from the Vishnevye Mts. in the Urals, a famous pegmatite region about 100 km south of Ekaterinberg, were...Wrexham, Wales ABSTRACT: Near Jordanow Slaski, deposits of nephrite jade are intimately associated with...ultramafic rocks around the Sowie Gory block. The deposits at Jordanow Slaski have provided the largest nephrite...nephrite jade, Poland Introduction The nephrite jade deposits at Jordanow Slaski rank among the largest and |  | | Journal (article/letter/editorial) | | granitic pegmatites. It occurs in all stages of pegmatite evolution and in a wide array of colors, from...pegmatites. It typically occurs in the late stages of pegmatite consolidation (e.g., miarolitic cavities and replacement...MINERALS Purple apatite from sixteen granitic pegmatite localities displays various shades of purple,...GADOLINITE-(Y) IN WISCONSIN: THE KELLER LAKE PEGMATITE. I: W Buchholzâ, A. U. Falste9, W B. Simmons2...Keller Lake pegmatite, is located approximately 0.5 kilometers east of Keller Lake. The pegmatite is now buried |  | | Journal (issue) | | tourmaline mine, Luc Yen Mining District, Yenbai Province, Vietnam . . . . . . . . . . . . . . . . . . ...Tourmaline from the Minh Tien pegmatite, Luc Yen Mining District, Yenbai Province, Vietnam . . . . . . . ....on Quartz, 12 cm, from the Minh Tien pegmatite, Yenbai Province, Vietnam. FrĂŠdĂŠric Escaut specimen and...above the title, representing the country, state, province or city in which the locality is situated. Occasionally...So I changed the soccer stripes to an all-black field behind the mining company logo, and thought at last |  | | Journal (issue) | | producingprecious precious occurrences stones:(a)(a)pegmatite, pegmatite,and and(b)(b)hydrothermal hydrothermal stones:...potential gem Somaliland producer in in the the Mozambique Belt producer Judith A. A. Kinnaird Kinnaird11...granite intrusions intrusions in in the the host Mozambique orogenic orogenic belt. belt. The The pegmatites...occur in in an an east-west east-west zone zone Mozambique through the the centre centre of of Somaliland...importance of of gems gems in in the the Mozambique Mozambique orogenic orogenic belt belt has has The |  | | Show/Event (guide) | | Diamonds of Namibia by Gene LaBerge Kola Peninsula Field Trip by Michael Skebo3 3 2 4 In My Opinion: IMA-CNMNC...Schlichter was a master collector and prodigious field collector. When he spoke from the podium, you could...tourmaline with tetrahedrally coordinated boron: Rossmanite and associated minerals from Newcomb, Essex County...e stage mineralogy of the Seerie Pegmatite, South Platte Pegmatite District, Jefferson County, Colorado... 3 8:15-9:15 MEXICO'S CARBONATE REPLACEMENT DEPOSITS: REACTIVITY IS EVERYTHING - Dr. Peter Megaw Peter |  | | Journal (issue) | | More on Cubearing color-change tourmaline from Mozambique 176 Gem News International Demantoid from northern...the submission of articles on all aspects of the field. Please see the Guidelines for Authors in the Fall...Alfred A. Levinson is an authority on diamond deposits. A former editor of Geochimica et Cosmochimica...preponderance of light yellow diamonds from the Cape Province in South Africa led to their description in the...noticeable color distinguished them from those of other deposits that yielded near-colorless or brown diamonds |  | | Journal (issue) | | âParaĂbaâ Tourmaline from Brazil, Nigeria, and Mozambique Lead GlassâFilled Rubies VOLUME 42 NO. 1 Tortoise...Copper-bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting by LA-ICP-MS Ahmadjan...the submission of articles on all aspects of the field. Please see the Guidelines for Authors on our Web...elsewhere in Brazil, as well as in Nigeria and Mozambique. The lead article in this issue describes how...latest research on gem localities, geology of gem deposits, gem characterization techniques, and gem treatment |  | | Journal (issue) | | MINE ."Iii[! iil"J www.tandfonline.com/vram Pegmatite Minerals & Gems WILENS EXQUISITE MINERALI ...Cook 10 Southern California Pegmatite Gems Mark Mauthner 16 The Pegmatite Interest Group (PIG) Is Hog...Hog Heaven! David London Pegmatite gems, p. 70 18 Pegmatites William B. Simmons, Karen L. Webber, and...Falster 33 Cliff Trebilcock, Lifelong Field Collector of Pegmatite Minerals, Recipient of the Maine Mineral...Heritage Award Donald A. Dallaire 56 Maine Pegmatite Workshop: Sponsored by the Maine Mineral & Gem |  | | Journal (issue) | | complete set of cutters ⢠Freestanding for use in the field or mount on your working table ⢠Capacity over 3...people of common interest together, conducting field trips, and providing educational opportunities....The surfaces are brilliant. From Tao Lin, Hunan Province, China, there were specimens of red sphalerite...cassiterites were brilliant; they are from Ximong, Yunnan Province, China. Jim DuFoe, assisting in the booth of Dal'id...a pinkish to purplish tint. These are from an alluvial occurrence, so most crystals are bruised. Cut |  | | Journal (issue) | | the submission of articles on all aspects of the field. Please see the Author Guidelines at gia.edu/gemsgemology...published in G&G are also welcome. Please note that Field Reports, Lab Notes, Gem News International, Micro-World...well as the geology of the Arkhangelsk kimberlite province. 168 Carbonado Diamond: A Review of Properties...sapphires. FIELD REPORTS 215 Big Sky Country Sapphire: Visiting Montanaâs Alluvial Deposits Tao Hsu, Andrew...final article, Tao Hsu and her coauthors survey alluvial sapphire production in the U.S. state of Montana |  | | Journal (issue) | | 326 Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar Brendan M. Laurs, Federico...tourmaline from Warner Springs, California ⢠Faceted rossmanite and other tourmalines from Nigeria ⢠Uvite tourmaline...the submission of articles on all aspects of the field. Please see the Guidelines for Authors in the Summer...grandchildren. Chuck leaves behind countless friends in the field of gemology, which he served so brilliantly for... RHODIZITE-LONDONITE FROM THE ANTSONGOMBATO PEGMATITE, CENTRAL MADAGASCAR By Brendan M. Laurs, Federico |  | | Journal (issue) | | ⢠Copper-bearing color-change tourmaline from Mozambique 252 pg. 249 Gem News International An untreated...the submission of articles on all aspects of the field. Please see the Guidelines for Authors in this issue...observation testing of actual diamonds by experts in the field, a major part of the research described in the present...scale of a photomicrograph with an actual measured âfield widthâ of the final image or a simple line in the...practiced in virtually all publications in the field, this writer sees no reason to detract from the |  | | Journal (issue) | | from Masisi, DRC|Yellow tourmaline from Mavuco, Mozambique|Tremolite from Tanzania|Tsavorite from Ethiopia|Black...te-meade-county-south-dakota). Although these deposits have been known since at least 1891 and abundant...from the Mogok Valley, so it is possible that the alluvial gems mined there originally formed in the Mogok...area. The gems are recovered as a by-product of alluvial gold mining. The rubies are light-to-medium purplish...3â15 mm long. Other gems recovered from these deposits include spinel (Figure 4b), spessartine (Figure |  | | Book | | 40Ar/39Ar Age of the Gem-Bearing BoqueiraĚo Granitic Pegmatite, Parelhas, Rio Grande do Norte, Brazil Reprinted...Gabriele Lanzafame Gem-Quality Tourmaline from LCT Pegmatite in Adamello Massif, Central Southern Alps, Italy:...Anthony E. Fallick and Yannick Branquet Emerald Deposits: A Review and Enhanced ClassiďŹcation Reprinted...Tsortanidis and Andreas Lampridis Gem Corundum Deposits of Greece: Geology, Mineralogy and Genesis Reprinted...Zappettini Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: |  | | Journal (issue) | | K., 1987. Blue and yellow sapphire from Kaduna Province, Nigeria. Journal of Gemmology, 20(7/8), 427-42...Mark V Gemolite binocular microscope using dark field illumination and overhead lighting as appropriate...the stone was rocked under the microscope (dark-field illumination). 10 take risk buyingit it such...andother otheryellow yellow tourmaline tourmaline deposits depositsininEast East Africa Africa C.C. Simonet...information is available on the geology of its deposits. little information is available on the geology |  | | Journal (issue) | | Instruments and Tips on Practical Gemology in the Field Edward W. Boehm An essential guide to the use of...the submission of articles on all aspects of the field. Please see the Guidelines for Authors in this issue...jewelry community. In honor of his leadership in the field, the tourmaline species liddicoatite was named after...public he serves. In honor of his leadership in the field of gemology, researchers at the Smithsonian Institution...influenced the development of the contemporary field instruments and techniques discussed in Edward Boehmâs |  | | Journal (issue) | | scheelite from Sri Lanka (Godakawela, Sabaragamuwa Province) and colourless scheelite from Mexico (Santa Cruz...synthetic diamond: the sharp peak at 467.7 nm (Field, 1992) and the doublet at 563.1/563.4 nm (amongst...diamonds. Jewellery News Asia, 231, November, 134â139. Field J.E., Ed., 1992. The Properties of Natural and Synthetic...formerly mined especially from the Katanga 302 Province of the Democratic Republic of Congo (DRC). Malachite...2009). With the discovery of enormous diamond deposits in Zimbabwe in 2006 and the appearance of such |  | | Journal (issue) | | the submission of articles on all aspects of the field. Please see the Guidelines for Authors at gia.edu/gandg...from Coscuez, Colombia; courtesy of Gene Meieran. FIELD TRIPS Above: Stewart mine owner Blue Sheppard (...Kessler, far left), Martin Katz, and Shivan Sarna field questions from the audience. Photo by Valerie Power...from Quebrada Grande, Venezuela (top), and an alluvial diamond from Namaqualand, South Africa (bottom)...& Associates, Fort Collins, Colorado Diamond deposits are rare occurrences that require specialized |  | | Book | | 2013). MALAWI Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series...Administered Tribal Areas and North West Frontier Province. Ilmenite crystal clusters to 12 cm across have...Mountain, Warsak district, North West Frontier Province. Surface diggings worked by local people on Zagi...Ilvaite occurs in the wallrock surrounding the manto deposits of polymetallic ores in the Taxco district, commonly...best of the classic ilvaite specimens of the skam deposits of Seriphos were collected near the beginning |  | | Journal (issue) | | Sapphire from the Tan HuongâTruc Lau Area, Yen Bai Province, Northern Vietnam Nguyen Ngoc Khoi, Chakkaphan...the submission of articles on all aspects of the field. Please see the Guidelines for Authors at gia.edu/gandg...characteristics of r uby and sapphire from Yen Ba i Province, in nor thern V ietnam. There is an ar ticle by...developments and the most comprehensive coverage in the field.â This still rings true today! Cheers, Jan Iverson...SAPPHIRE FROM THE TAN HUONGâTRUC LAU AREA, YEN BAI PROVINCE, NORTHERN VIETNAM Nguyen Ngoc Khoi, Chakkaphan |  | | Journal (issue) | | the submission of articles on all aspects of the field. Please see the Guidelines for Authors in the Summer...in Hawaii were encouraging. Tasmania entered the field in the early 1990s, when Abalone Pearls Pty. Ltd...very thin layers of organic material and whitish deposits that dulled the luster; these are removed during...âAbsorption and Luminescence Spectroscopy,â in J. E. Field, Ed., Properties of Natural and Synthetic Diamond...Glasgow) and colleagues studied inclusions within alluvial diamonds from SĂŁo Luiz, Mato Grasso, Brazil, and |  | | Journal (issue) | | from Myanmar ⢠Cu-bearing tourmaline mines in Mozambique ⢠New Cu-bearing tourmaline from Nigeria ⢠Synthetic...the submission of articles on all aspects of the field. Please see the Guidelines for Authors on our Website...Tanzanian bush at Tunduru, spitting distance from Mozambique, on the Muhuwesi River. Iâm haggling over a parcel...article titled âCopper-bearing Tourmalines from New Deposits in ParaĂba State, Brazilâ for the journalâs Fall...Copper-bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting by LA-ICP-MSâ (Spring |
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