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| in the kimberlites of Lesotho, Rhodesia, Sauth Africa, and Tanzania. Six new mineral assemblages, which...ibole; garnet-spinel; garnet-clinopyroxene-quartz; garnet-clinopyroxene-high sanidine; garnet-clinop...derived. The physical properties (n and a0) of garnet from 136 peridotites and pyroxenites have indicated...(uvarovite -~ andradite). Similar measurements of garnet from 57 eclogitic rocks have enabled us to locate...plus scapolite.amphibole-eclogite, and garnet-spinel plus garnet-corundum rocks form the new groups. 0 |
 | | Journal (article/letter/editorial) |
| Geochemistry, University of Cape Town, Rondebosch, South Africa Received May 13, 1968 Abstract. The chemical...authors has been examined. A gap in the range of garnet volume percentages occurs in the samples studied...d 30 %. Garnet peridotites characteristically have < 15 % garnet and eclogites > 30% garnet. Very rare...orthopyroxene. All b u t two of the peridotite-pyroxenite group contain orthopyroxene. The garnets from the peridotites...corundum eclogite. The reasons for the differences in garnet chemistry are considered a n d a tentative evolutionary |
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| Kimberlites are consequently of interest to a diverse group of earth scientists, ranging from isotope g~ochemists............................... 126 5.3.3.2. West Africa ........................................... 126............ .................... 6.4.3. Pyroxene-Garnet Intergrowths (Paragenesis 3) . . . . . . . . ..... . . . . . . . . . . . . 6.4.9. Orthopyroxene-Garnet Intergrowths ................................ 6...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith |
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| relevant protective laws and regulations and therefore free for general use. 2132/3130-543210 To my wife,...collaboration. Much of my fieldwork in southern Africa has been carried out with the cooperation and assistance...7.3 2.8 2.9 Africa . . . . . . . . . . . . . . . . . . . . . . . . . . . . West Africa . . . . . . .... . . . . Central Africa. . . . . . . . . . . . . . . . . . . . . . . East Africa. . . . . . . . . .... . . . . . . . . . . . . . . . Southern Africa . . . . . . . . . . . . . . . . . . . . . U.S.S.R. . |
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| Laboratories, P.O. Box 106, Crown Mines 2025, South Africa c Department of Geology and Applied Geology...elements and some trace elements for southern African garnet harzburgite and lherzolite xenoliths [F.R. Boyd...harzburgitic garnets, when normalised to a āprimitiveā garnet composition, are depleted in MREE and HREE and...depletion (partial melting) originating in the garnet stability field. We suggest that the protolith...flat REE patterns when normalised to a primitive garnet, a paradox which requires a secondary enrichment |
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| ion-probe trace element analyses of clinopyroxene-garnet pairs both included within diamonds and from the...to host minerals is found for all four samples. Garnet and clinopyroxene inclusions in the diamonds from...changing magmatic and/or P-T conditions in the mantle. Garnet trace element compositions are similar in relative...trace elements in garnet under mantle temperatures and consequent alteration of the garnet, and not due to...report of diamondiferous eclogite xenoliths from South Africa [4]. The first analytical data on garnets from |
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| responsibility for authorsā errors and omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE... De Beers Consolidated Mines SPONSORS Bateman Group (including Bateman Process Equipment, Bateman Minerals...Trans Hex Group Ltd CONTRIBUTORS Council for Geoscience (Geological Survey of South Africa) SouthemEra...Ltd SOCIETY SPONSORS Geological Society of South Africa (GSSA) The International Association of Geochemistry...Pressures and Temperatures. Relationships between garnet and clinopyroxene in Vitim mantle xenoliths: evidence |
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| ā_ā 1.12 ā 8 10 ā ā_ 12 14 _ ā Courtesy of F&S Group Geology and World Deposits TAO 6.30 5.60 5.00 4...and related materials Feldspar 106 Fluorspar Garnet Graphite 110 Slate Sodium sulfate 122 = 130...major producing districts, or a representative district if there are many. We name the chief mining companies...supply must come not merely from one district but from a single mine. Thus the physical properties of many...the industrial minerals covers a highly diverse group of materials. At the one extreme is gravel and crushed |
 | | Journal (issue) |
| in opal ā¢ Trapiche-like ruby from the Batakundi mine in Kashmir ā¢ Sapphire inclusion with rutile āsilkā...nephrite from Washington ā¢ Color-change pyrope garnet ā¢ Colombian emerald and Mozambican ruby ā¢ Colored...Moonstone jewelry ā¢ Oregon sunstone ā¢ Potentate mine sapphire update ā¢ āRainbow latticeā feldspar ā¢ Responsibly... Paris, France Wuhan, China Johannesburg, South Africa Gaston Giuliani Thomas M. Moses Wuyi Wang...add GST. Discounts are available for renewals, group subscriptions, GIA alumni, and current GIA students |
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| 74470 02033 2 -----~ALPHA Suoolv. Inc. Toll Free: (800)257-4211 1---1i-o_l_lF_r_e_e_F_a_x_:-(8_0_0_)_2-57...Add ress State Zip Cou ntry February 2002 Volume 32. Number 2 12 The Gem s of Africa A treasure...Future of Leadville, Colorado A metal-mining district turns to tourism; by Steve Voynick REGULAR FEATURES...t worry about the quality of your writing; just state clearly the steps you followed to complete your...sĀ·ize (5 lb mĀ·1n ) 1 #72390 4 $3 00 MUGGLESTONE - Africa j QUARTZ : Rock Cry;tals ;,,/;Ā·Termi~~i i~~:Ā·era~il |
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| Sapphire Chrysoberyl, Topaz and Spinel Beryl The Garnet Group Tourmaline and Zircon Quartz, Agate and Chalcedony...gravel C. Corundum group D. Chrysoberyl and spinel E. Beryl group F. Garnet group G. Topaz and tourmaline...tourmaline H. Zircon I. Quartz group J. Opal K. Chalcedony group L. Jade minerals M. Lapis lazuli...Underground working at Premier Diamond Mine zb. Grease tables at the Premier Mine 3. Removing the overburden covering...covering diamondiferous gravels on coast of South West Africa II ILLUSTRATIONS 4. Rough diamonds with |
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| a mineral belonging to the actinolitetremolite group having the nature of an asbestos. cabochon a gemstone...the magma as a whole. Diamondiferous pipes in South Africa and elsewhere contain this kind of rock. When...is so silica rich that much of it crystallizes as free silica in the form of quartz, as in a granite. Along...cavities. Contact metamorphism is usually fairly local in extent but where the country rock is recrystallized...is also convenient since stones do not need to be free from their settings and the test is non-destructive |
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| Sciences University of Cape Town Rondebosch, South Africa ISSN 2510-1307 ISSN 2510-1315 (electronic)...relevant protective laws and regulations and therefore free for general use. The publisher, the authors and...Azurite crystals, partly replaced by malachite, Tsumeb mine, Namibia; width of view ca. 3 cm; collection H.E... . . . . . . . . . . . . . . . . . . . Calcite Group, 3Ģ2/m . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . Aragonite Group, 2/m2/m2/m. . . . . . . . . . . . . . . . . . . |
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| (Hungary) (Croatia) (Hungary) (Slovakia) (Serbia) (South Africa) (Austria) (France) (Hungary) (Hungary) (Hungary)................................245 EG52 Platinum-group minerals in the new millennium......................................285 EG55 Mineral deposits of Africa...........................................................................319 EM61 Mineralogy of mine wastes and contaminated soil......................Exploration and Dept. of Chemistry/Biochemistry, Arizona State University, Tempe, AZ, USA (pbuseck@asu.edu) The |
 | Kogel, Jessica Elzea, Trivedi, Nikhil C., Barker, James M., Krukowski, Stanley T. - Eds. (2006) Industrial Minerals and Rocks (7th ed.) Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO. | Book (edition) |
| . . . . . . . . . . . . . . . . . . . . . . . . Mine Safety and Health Law . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . . . . . Garnet . . . . . . . . . . . . . . . . . . . . . . . ...can depend on for many years, an international group of volunteer authors, coauthors, and associate editorsāall...least one peer re view. Finally, an outstanding group of professional copy editors, proofreaders, graphi...Geological Survey Salt Lake City, Utah Richard B. Berg Garnet Services, Inc. Kirkland, Washington James D. Hansink |
 | | Book (edition) |
| years after Churchās letter appeared in print, the South African diamond rush was in full spate, and 5000...identiļ¬cation of a new gem variety, green demantoid garnet. One of many disturbing events in the jewellery...mound of ruby powder in a ļ¬ame. Meanwhile, in South Africa, Cecil Rhodes and Barney Barnato had ļ¬nally...opencast workings of the Premier mine near Pretoria in South Africa. In the same year in England, Dr...the time by an independent investigator, the ASEA group of Sweden claimed to have developed a repeatable |
 | | Report (volume) |
| underlie and control the structural and thermal state, processes, and evolution of the planet. New techniques...mineral physics such as melt properties, equations of state, elasticity, rheology, vibrational dynamics, bonding...structure, formation, evolution, and current dynamic state of the Earthās core is an area of tremendous excitement...models for the outer and inner core flow, structural state, evolution, and the geodynamo. Moreover, there is...area include increasingly accurate equations of state (Duffy and Wang, Chapter 14) required for modeling |
