 | | Book |
| Director Natural History Museum of Los Angeles County Featuring Photographs by Harold and Erica Van...Western Australia Index 141 FOREWORD Each gem deposit-whether of primary origin in the parent rocks;...impression that one is actually present in a described deposit; observing how the gem crystals grow in their birth...gallery in the Natural History Museum of Los Angeles County, entitled "Gemstones and Their Origins," which...detail, along with an example of an important gem deposit where this process has been observed. In each chapter |
| | Book |
| Director Natural History Museum of Los Angeles County Featuring Photographs by Harold and Erica Van...Western Australia Index 141 FOREWORD Each gem deposit-whether of primary origin in the parent rocks;...impression that one is actually present in a described deposit; observing how the gem crystals grow in their birth...gallery in the Natural History Museum of Los Angeles County, entitled "Gemstones and Their Origins," which...detail, along with an example of an important gem deposit where this process has been observed. In each chapter |
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| GemeWizard Ltd., Ramat Gan, Israel; Guanghai Shi, China University of Geosciences, Beijing; James E. Shigley...Microsystems, Wetzlar, Germany; Bear Williams, Stone Group Laboratories LLC, Jefferson City, Missouri, USA;...and Bear Williams (info@stonegrouplabs.com) Stone Group Labs, Jefferson City, Missouri, USA Dr George R...Kondoa District, Tanzania A historically important deposit of chrysoprase and prase opal in Tanzania is located...and polished material (e.g. Figure 7) from a new deposit in Tanzania was shown by Werner Radl (Mawingu Gems |
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| liddicoatite, the calcium end-member of the tourmaline group.) Within the last two decades, important quantities...Mananjary, on the island's east coast. Both ruby and sapphire were among the stones Professor Smith listed for...(1992)describe an unusual type of m~~lti-colored sapphire from a locality called Ianlzarolza~southwest of...the Andranondambo (also called Andranondamtso) deposit in southern Madagascar has turned out to be a significant...production. The much-talked-about Andranondambo sapphire deposit is not a recent discoveryl although fine-quality |
 | | Journal (article/letter/editorial) |
| from the text by simply using the code of each deposit in the chart. This code can be created by combining... . . . . 3.4. Metamorphic chromium (gemstone) deposit . . . . . . . . . . . 3.5. Chromium supply and.... . . . . . . . . . . . . . . . . . . Platinum group elements (PGE) . . . . . . . . . . . . . . . . ...platinum-group-element deposits . . . . . . . . . . . . 6.3. Structure-related platinum-group-element...Sedimentary platinum-group-element deposits . . . . . . . . . . 6.5. Platinum-group-element supply and |
| | Journal (article/letter/editorial) |
| from the text by simply using the code of each deposit in the chart. This code can be created by combining... . . . . 3.4. Metamorphic chromium (gemstone) deposit . . . . . . . . . . . 3.5. Chromium supply and.... . . . . . . . . . . . . . . . . . . Platinum group elements (PGE) . . . . . . . . . . . . . . . . ...platinum-group-element deposits . . . . . . . . . . . . 6.3. Structure-related platinum-group-element...Sedimentary platinum-group-element deposits . . . . . . . . . . 6.5. Platinum-group-element supply and |
 | | Journal (issue) |
| CIBJO congress Pigeon blood and royal blue lectures China lectures IGC Namibia 18 / SSEF RESEARCH Jewellery...Jewellery Matters Symposium GemTOF Madagascar/Kashmir sapphire SGG 75th anniversary Age dating of sapphires...Mini Ming cultured pearls Donations Update on China FW pearl production Pearl with Fe-Hydroxide Pearls...yellow colour saturation. rr Figure 1: Fancy sapphire recently found in Madagascar showing an unstable...centres. Such colour centres rr Figure 2: Yellow sapphire of >50 ct with unstable (reversible colour), seen |
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| Scapolite from Madagascar . . . Pietersite from China and Namibia . . . New Mexifire Synthetic Opal ....Microstructural Study of Pietersite from Namibia and China Kaifan Hu and Peter J. Heaney Compares the properties...glassāfilled ruby damaged during repair ā¢ Sapphire with a sapphire inclusion ā¢ Synthetic spinel and synthetic...ā¢ Natural pearl diving off Bahrain ā¢ Ruby and sapphire mining in Pakistan and Afghanistan ā¢ Rediscovery...Rediscovery of sapphires in central France ā¢ Sapphire mining in southern Madagascar ā¢ A strongly thermoluminescent |
 | Sorokina, Elena S., Karampelas, Stefanos, Nishanbaev, Tursun P., Nikandrov, Sergey N., Semiannikov, Boris S. (2017) Sapphire Megacrysts In Syenite Pegmatites From the Ilmen Mountains, South Urals, Russia: New Mineralogical Data. The Canadian Mineralogist, 55 (5) 823-843 doi:10.3749/canmin.1700016 | Journal (article/letter/editorial) |
| pp. 823-843 (2017) DOI: 10.3749/canmin.1700016 SAPPHIRE MEGACRYSTS IN SYENITE PEGMATITES FROM THE ILMEN...alkali feldspar group were identified as syngenetic inclusions within the blue sapphire. Monazite-(Ce)...in Chantaburi province (Thailand). Keywords: sapphire, syenite pegmatite, Ilmenogorsky complex, inclusions...weathering of primary deposits. Discovering gem sapphire deposits in situ within the host rocks is signiļ¬cantly...the continental margin (Rusin et al. 2012). The sapphire deposits are found in the syenite pegmatites enclosed |
 | | Book (edition) |
| II Ruby and Sapphire Beryl Chrysoberyl Spinel Topaz Tourmaline The Garnets Feldspar Group Zircon Peridot...book would be more sensibly shared out among a group of authors/gemmologists, each member tackling his...Edition being extracted from āGems of the Silica Groupā to form a separate chapter. I have also reintroduced...time, while diamonds have also been discovered in China in some quantity. Several new gem minerals, or minerals...knowledge. In the cases of emerald and ruby and sapphire new sources of supply have necessitated additional |
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| you to become a Fellow and join this important group and Wear the medallion with pride! Contact Tom...couple of famous localities: Spruce Ridge in King County, Washington (for quartz and pyrite) and the Rock...GOLD 10 cm Eagleās Nest Mine Sage Hill, Placer County California, USA Ex M. Pospisil Collection Photo...release selections for sale! Dallas, Texas & Guilin, China info@iRocks.com Facebook.com/Arkenstone.iRocks |...reaches through Shan State up to the border with China (and about 65 km east of the city, amid the hills |
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| England. Keller P C , (1983)The Capiio topaz deposit, Ouro Preto, Minas Gerais, Brazil. Gems el Gemology...magnesium-bearing calcite and dolomite. A trapiche-type sapphire is also described. ABOUT THE AUTHORS Dr. Schrnetzeris...research, we also encountered one gray trapiche-type sapphire (BoxA). MATERIALS AND METHODS All samples were...purchased several cabochons and one faceted trapiche sapphire in Myanmar in early 1996; at that time, he was...Engelbrecht, pers. comm., 1996). A 6.59 ct trapiche sapphire was purchased by one of the authors (HAH).It is |
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| Green quartz with Brazil-law twinning ā¢ Synthetic sapphire with unusual yellowish green bodycolor ā¢ Spinel...primary concern for this younger, less-affluent group, followed by the fact that they had left the profession)...recent G&G article on berylliumdiffused ruby and sapphire (J. L. Emmett et al., Summer 2003, pp. 84ā131)...counterclockwise from top right, are a 5.37 ct purple sapphire, a 2.18 ct emerald, a 2.02 ct Fancy yellow diamond...vendor to extol the quality of color in an orange sapphire (figure 9), he or she would be creating a duty |
 | | Book (edition) |
| Colorado, cubanite from Cuba, kernite from Kern County in California, aragonite from a former kingdom...blunder in naming any mineral was in regard to pyroxene, which comes from the Greek "fire" and "stranger"...always alloyed with other metals of the platinum group Peninsula of northern Michigan and other copper...the aluminum industry. and so the mineral land deposit, now is nearly invisible depleted, Crystals...minerals are usually distinguished. The calcite group, the members of which belong to the hexagonal |
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| Diopside, CaMg(Si 2 0 6 ), is a member of the pyroxene group and is one end of the continuous crystalline...Recently, coupled substitutions in the tourmaline group were examined by statistical methods (Foit & Rosenberg...MEMBER Coupled substitutions in the tourmaline group were described by Foit & Rosenberg (1977). For members...is the second new (old) member of the tourmaline group, which is no longer regarded to be a hypothetical...(1977): Coupled substitutions in the tourmaline group. Contrib.Mineral.Petrol., 62, 109-27. HƤnni, H. |
 | | Book (edition) |
| Aquamarine 5) 80 Ć© 86 Black Opal 92 Blue Sapphire 102 Chalcedony 112 Cultured Pearl 120 Demantoid...Demantoid 130 Diamond 138 Emerald 146 Fancy Sapphire 154 Imperial Topaz 162 Jade 170 Kunzite...crystal (macrocrystalline), such as Amethyst, Sapphire and Tourmaline. Other gems have a crystal structure...through a transparent gemstone and examples include Sapphire and Tanzanite. As it directly affects the communication...four 1 carat gems of the same quality. However, a group of smaller gems will cost more than a single gem |
 | | Book |
| long (Marty, 2004 ). AFRICA widely in Litchfield County, where good crystals were taken from quartz veins...region (Brunet, I 977b ). NEW YORK Amity, Orange County. At many isolated collected sites between the towns...fine crystals of spine!, titanite, amphibole and pyroxene have been found since the early 19th century,...Litchfield County. Ilmenite masses and crystals from somewhere near Washington, Litchfield County, were described...Lake Road occurrence, Faraday Township, Hastings County. In fall 1994, Dan and Shelley Lambert extracted |
 | | Report (volume) |
| P., 15. California, Barstow quadrangle: Trenton group, Ordovician: Bowen, O. E., Jr. , 5. Clark, T. H...4. also Limestone; Dolomite; Western, Claiborne group: Miss. Phosphate. Geol. Soc., 2. California: Calif...described. Div. Mines, 1; Jenkins, O. P., Choctaw County, Highway 17 area: 3. Toulmin, L. D., Jr., 3. Minor:...D., 3. Talladega County, hematiteOklahoma, potash agstone, granite magnetite deposit: Pallister, and other...ground water: Powham, C. E. ell, W. J., 4. Marengo County: Newton, J. G., 1. Core-drilling program, ChattanooMica: |
