 | | Catalog/List | | Pakistan.Crystal 20x27x24mm. £125 2 AMAZONITE & SMOKY QUARTZ Kon.so, Sidamo, Ethiopia. Smoky aystal 25mm. Amazonite...Zaire. 35x27x20mm. £42 8 SPESSARTINE Marienfluss, Kunene, Namibia. Main~ 10mm. 50x35x24mm. £48 9 SPESSARTINE...SPESSARTINE GARNET on SMO~ QUARTZ, Xiong Huan Pu Mine, Cheng Zhou, Hunan Prov., Clhina. Quartz aystal 55mm. 7mm |  | | Catalog/List | | 9mm. Ex Col. Williams Colin. 55x40x44mm. £85 5 QUARTZ with sand inclusions, Novo Horizonte, Bahia, Brazil...54x20x20mm £24 9 TOURMALINE, variety Schorl, Erongo, Namibia. Lustrous doubly termninated crystal. 40x36x35mm...Main cube 15mm. 56x53x28mm. £65 10 NATIVE GOLD in quartz Gympie, Queensland, Australia. Rich location specimen...59x43x28mm. £24 13 FLUORITE and SCHORL, Erongo, Namibia. Very unusual crystal formations. 67x48x56mm. £32...61x40x38mm. £28 16 SPESSARTINE garnets, Marienfluss, Kunene, Namibia. Orange xtls to 10mm. 50x34x22mm. £24 |  | | Report (issue) | | MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY NAMIBIA I 1990 Open File Report MRS 05 2 Abstract A...wide variety of semi-precious stones occur in Namibia, namely amazonite, the beryl varieties, chrysocolla...cordierite, dioptase, dumortierite, pyrophyllite, the quartz varieties the garnet varieties, milarite, including...rose quartz and smoky quartz are currently the most important semi-precious stones found in Namibia. The...turquoise. An extensive deposit of amethyst occurs in quartz-calcite veins in rocks of the Swakop Group. Druses |  | | Journal (article/letter/editorial) | | 15:29 06 November 2014 Spessartine Marienfluss, Northern Namibia I n a recent issue of this magazine...end, a fine spessartine specimen from Marienfluss, northern Namibia, has been chosen. Spessartine, because...spessartine crystal on matrix from Marienfluss, northern Namibia. Houston Museum of Nature and Science...apatite, albite, muscovite, potassic feldspar, and quartz in the former, and bixbyite, topaz, sanidine, and...massive spessartine and relatively small crystals in quartz matrix occur at Jail Hill near Haddam, Connecticut |  | | Catalog/List | | the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...climbing soon brought him into contact with the quartz crystals that were found on the mountain slopes...engineering work took him to the Tsumeb Mine in Namibia. This mine is renowned for producing what are arguably...desert-like "Sperrgebiet" area of the southern coast of Namibia, with its fabulous wealth of gem diamonds. One...Ian’s interest stems from the family trips to Namibia, including the mines of Tsumeb. He worked with |  | | Journal (article/letter/editorial) | | February 2015 Cover Photographs January/February: Quartz, several localities; John Lucking, Jeff Scovil...Bahmann, U., Raspite from the Erongo Mountains, Namibia, 272–74 Baileychlore, 319 Bailey, D. G., see Thirty-sixth...Cairncross, B., Raspite from the Erongo Mountains, Namibia, 272–74 Calaverite, Cripple Creek, Colorado, R...Collector’s Note, Raspite from the Erongo Mountains, Namibia, B. Cairncross, H. Van Niekerk, C. Reineke, U....Autonomous Region, China, R. B. Cook, 242–48; Spessartine, Marienfluss, Northern Namibia, R. B. Cook |  | | Journal (article/letter/editorial) | | 10 percent of the photographs used in the first Namibia book are repeated here, so most are new. Many of...map showing its location in Namibia. Furthermore, unlike the first Namibia book that had multiple reference...reference lists after each region, there is one composite reference list at the end of the book making it...Karibib-Usakos district, Kombat, Krantzberg, Marienfluss, Mesopatamie 504, Namib Lead mine, Okandawai... Van der Plas mine, and small-scale mining in Namibia, plus references, index, photo credits, and acknowledgments |  | | Book | | Mountainland The Central Northern to Northwest Region including Damaraland The Central Namib Desertand...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275... Encyclopedia of the Mineralsof Namibia 443 Meteorites in Namibia Bibliography Index Photo credits...__ Republic of Namibia The President State House W°Ntdhoek FOREWORD Namibia is endowed with an...from near and far. Fine mineral specimen from Namibia are displayed in all the famous natural science |  | | Journal (issue) | | Barcelona, Spain 544-550 Shattuckite, Kunene District, Kaokoveld, Namibia 557-558 Collecting at Hallelujah...gemstones from Canada 50-59 Spessartine from Marienfluss, N-Namibia 60-61 Campbell Bridges (1938-2009) 66-72...d'hématite et d'ilmenite 72-75 Les cristaux de quartz pseudocubiques de la grève de Porsguen en Plougastel-Daoulas...DES MICROMONTEURS # 105, 06.09 7 Rose and blue quartz 28-31 The geology of Charles Darwin (part 1) 44-46...tombée sur terre AGAB MINIBUL 43(2), 02.10 25-37 Quartz "à âme" FACETTEN 43(1), 02.10 188 NAUTILUS |  | | Journal (article/letter/editorial) | | associated minerals include calcite, dolomite, quartz, clinozoisite, wollastonite, scapolite, vesuvianite...modified dodecahedra associated with clinozoisite, quartz, and diopside (King and Foord 1994). There is a...Figure 12. A 14-cm-high specimen of grossular in quartz from the Pitts-Tenny quarry, Minot, Androscoggin...dodecahedral, and 5 cm on edge; they are in a milky quartz matrix. What caught my attention when I saw them...mine, Chaffee County. They are associated with quartz, epidote, clinochlore, and actinolite after diopside |  | | Book | | REPUBLIC OF NAMIBIA - MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY THE MINERAL RESOURCES OF NAMIBIA FIRST...ENERGY Of the several hundred minerals present in Namibia, around sixty have been exploited. some, such as...base metals and industrial minerals have helped Namibia rank amongst the top five mining countries in Africa...terms of production and reserves. In this context, Namibia is a major producer of copper, lead, zinc, cadmium...unpublished. It is evident that mineral exploration in Namibia, as elsewhere. has changed from serendipitous discoveries |  | | Journal (issue) | | the world 's m ost important diam ond-producing region . Certainly. African sources contin ue to produce...continuing role as the most important dia mond-producing region in the world , surpassing in overall impact even...discovered in 19 10 (Kunz, 1911i Cobba, 1989), in the region south of Lake Victoria. In 1925, Tangan yika Dia...Kenya Lesoth o Liberia Malawi Mali Mozambique Namibia Nigeria Sierra Leone South Africa Swaziland Tanzania...fSouthern Alrica encompasses: Botswana, Lesotho, Namibia, South Africa, Swaziland, and Zimbabwe. gCentral |  | | Journal (article/letter/editorial) | | (agate, amethyst, citrine, emerald, quartz, rose quartz, smoky quartz, morganite, and aquamarine, beryl)...1). All but three gemstones (varieties of beryl, quartz modifications, amber) are heavy minerals by definition...range of the most common rock-forming minerals, quartz, plagioclase, alkaline feldspar, and calcite) (Table...minerals feldspar s.s.s. (=solid solution series), quartz, phyllosilicates, and carbonate minerals as main...gemstones from the diluting thrash or gangue minerals (quartz, feldspar) by their different specific gravities |  | | Book | | (clockwise from top left): Quartz Citrine crystal; Fluorite; Vanadanite; Quartz crystal (see text for details)...Republic, 6 cm). Figure 1.2 Halite crystals (Namibia, 5.8 cm). 6 section devoted to the display of...in groups 8–12, show marked deviation. In this region of the Periodic Table, electronegativity increases...bonded substances, the electrons are confined to the region between the nuclei of the bonded atoms and they...together only by the attraction of Figure 4.1 The quartz crystals (right) are bounded by flat surfaces, |  | | Journal (issue) | | 11 DTCsightholder manufacturing facilities in Namibia. However, these are supplied from all DTC sources...of cutting factories throughout South Africa, Namibia, and Botswana, such as this facility in South Africa...with the opening of a new mine in the Nova Era region and technological developments at established mines...created potential for unrest in an already volatile region of the country, formulated a stimulus package (Golan... Tanzania, works a tsavorite mine in the rural region of Lemshuko. To serve the needs of the miners’ |  | | Book | | known to humankind since prehistoric times such as quartz and gold, but also minerals first described quite...coppercrystals come from many localities like Tsumcb, Namibia and Chessy. France. Crystals up to 140mm (5'A in)...secondary. It occurs with pyrite, arsenopyrite, quartz, sylvanite. calaverite. krennerite and other minerals...in many localities in California, USA (Colorado Quartz mine. Nigger Hill and others). Fine leaf gold comes...to 15 mm ("/» in) come from Konder in Khabarovsk Region, small crystals, but mainly nuggets, weighing up |  | | Journal (issue) | | idealized diagram of the occurrence of opal in this region).The sandstone is usually overlain by a silcrete...Photomicrograph by Shane F. McClure; magnified 30x. plus the region beneath, where less of the chromium has penetrated...1982, mineral enthusiast Kauko Sairanen noticed a quartz outcrop near a small road in Luumaki, a commune...interest were elongated pockets that were lined with quartz crystals and contained a pale yellow transparent...found only occasionally. In addition to several quartz varieties, small amounts of topaz, l u n zite, |  | | Book | | known to 1umankind since prehistoric times such as quartz 1nd gold, but also ~minerals first described quite...coppercrystals co1ne from many localities like Tsumeb, Namibia and Chessy, France. Crystals up to 140mm (5½ in)...secondary. It occurs with pyrite, arsenopyrite, quartz, sylvanite, calaverite, krennerite and other minerals...in many localities in California, USA (Colorado Quartz mine, Nigger Hill and others). Fine leaf gold comes...15 mm (1 9h2 in) come from Konder in Khabarovsk Region, small crystals, but mainly nuggets, weighing up |  | | Journal (issue) | | water pools and scorching soil: This marvelous region (Plutonian realm) was discovered in 1847 by Mr...Great Valley sequence in The Geysers-Clear Lake region of northern California. In Field Trip Guide to...magnetic studies o f The Geysers-Clear Lake geothermal region, California. U.S. Geological Survey Open File Report...A /A / A / A Figure 3. The M ain pit; seams of quartz and calcite are visible in the calc-silicate matrix...Grossular Meionite Molybdenite Powellite Pyrite Quartz Scheelite Sphalerite Titanite Vesuvianite Main |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Especially when the mineral species is common, such as quartz (75.1.3.1), many varieties (jasper, onyx) are known...chemistry and structure are identical to those of quartz. 5D. Polytypes Materials whose basic structural...only with fibrous minerals Columbite, wolframite Quartz Opal, some yellow varieties of sphalerite Nepheline...are distinctive. Chonchoidal fracture, typical of quartz, gives a fracture similar to the interior of a...Calcite 4 5 6 Fluorite Apatite Orthoclase a Quartz Soft, greasy feel like tale and graphite, and |
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