 | Adamo, Ilaria, Gatta, G. Diego, Rotiroti, Nicola, Diella, Valeria, Pavese, Alessandro (2011) Green andradite stones: gemmological and mineralogical characterisation. European Journal of Mineralogy, 23 (1) 91-100 doi:10.1127/0935-1221/2011/0023-2079 | Journal (article/letter/editorial) | | and Kaghan, Pakistan), or in skarn rocks (Erongo, Namibia, and Antetezambato, Madagascar) has been performed...garnets, often described with the varietal name ‘‘demantoid’’, represent one of the most appreciated and precious...due to their colour, brilliance, and rarity. Demantoid crystals are generally small, with finished stones...and gems over 2–3 ct quite rare. The prices of demantoid garnet vary tremendously (i.e., 150–1000 $/ct)...2001; Quinn & Laurs, 2005), in the Erongo Province, central Namibia (Cairncross & Bahmann, 2006) and in |  | | Journal (article/letter/editorial) | | Abstract Crystals of gem-quality andradite (variety “demantoid”) from Val Malenco, Italy, have been analyzed...deposits of the world (Russia, Iran, Pakistan, Namibia, Madagascar). They are all of gem quality and vary...solution, with the sole exception of the sample from Namibia, showing a composition varying from pure andradite...during growth. Keywords: andradite, variety “demantoid”, gem quality, major-element composition, trace-element...yellow (variety “topazolite”), green (variety “demantoid”), black (variety “melanite”) and red, due to |  | | Journal (article/letter/editorial) | | heterogeneity in garnet from Kakanui (New Zealand) and Erongo (Namibia) MAJA UROSEVIC1,*, OLIVER NEBEL2, JOSÉ ALBERTO...garnets (skarn) from two different localities in Erongo, Namibia. The in situ analyses are complemented by bulk...(d18OVSMOW = 5.67 ± 0.02‰). Magmatic garnet from Erongo, Namibia, is rich in Mn and Fe2þ and very poor in Ca...(d18O = 9.3 ± 0.3‰, 1s). Hydrothermal garnet from Namibia is rich in Ca and Fe3þ and shows strong zonation...separates are heterogeneous in both crustal garnet from Erongo with a large spread ranging from 0.15 to þ0.30‰ |  | | Thesis/Dissertation | | .............................. 19 2.5.3.1. Demantoid ..................................................................... 22 2.5.3.1.2.4. Erongo Province, Namibia ..................................................................... 110 4.3.1.3. Demantoid ............................................................................. 147 5.9.2.3. Demantoid ................................................slightly yellowish green through orangy yellow Demantoid, topazolite Pyrope 1.714-1.742 Purplish red |  | | Report (issue) | | cm tall andradite on hematite is from the Wessels Mine near Hotazel in northern Cape Province, South Africa...Cover: Grossular on diopside; 7.1 cm tall Jeffrey Mine, Asbestos, Richmond County, Quebec, Canada Paul...percent of the green gem andradite (variety "demantoid") originating in Russia is enhanced through heating...mitigate some of the brown and yellow tones of "demantoid." But irradiation does not seem to have any impact...Spessartine, schorl, and a/bite from the Little Three Mine in San Diego County, California; 6. 6 cm tall; Bryant |  | | Journal (issue) | | looking squarely into the top of a stone at the culet region; doubling is only seen when focusing deeper at...gemstone material in facets, but not in the culet region (here somewhat out of focus) because the view is...2300°C; • growing crystal 100°C cooler than the feed region; • seed crystal orientation slightly off axis and...relative transparency in the near-ultraviolet, a region where near-colourless diamond is transparent and...diamondiferous gneiss and marble from the Lake KumdyKol region of the Kokchetav Massif, N Kazakhstan. The examination |  | | Book | | Tsumeb, Namibia and Chessy, France. Crystals up to 140mm (5½ in) long occurred in the Ray mine and in...100 mm (4 in) long, come also from the San Genaro Mine in Huancavelica and Uchucchaqua, Peru. New finds...Dorado, California, US.A. Gold, 68 mm, Eagle's Nest Mine, California, US.A. Gold gold on it. Typical aggregates...many localities in California, USA (Colorado Quartz mine, Nigger Hill and others). Fine leaf gold comes from...mm (4 5/i6 in) long were very rare in Ground Hog mine, Gilman, Colorado, USA. The largest known sheets |  | | Book | | Tsumcb, Namibia and Chessy. France. Crystals up to 140mm (5'A in) long occurred in the Ray mine and in...100 mm (4 in) long, come also from the San Gcnaro Mine in Huancavclica and Uchucchaqua, Peru. New finds...many localities in California, USA (Colorado Quartz mine. Nigger Hill and others). Fine leaf gold comes from...110 mm (47.6 in) long were very rare in Ground Hog mine, Gilman, Colorado, USA. The largest known sheets...of crystallized gold occurred in the Jamestow n mine. California, USA, where a cavity, which yielded |  | | Journal (issue) | | by von Knorring and Sahama from northwest ern Namibia, namibite has been identified from a number of...Elias mine, Czech Republic Mrazek et al. (1994) report an occurrence of namibite from the Elias mine, Jachymov...5’6Evans-Lou pegmatite, Quebec CZECH REPUBLIC 7Elias mine, Jachymov ENGLAND 8Buckbarrow Beck, Cumbria GERMANY...Hechtsberg quarry, Hausach NAMIBIA 10Khorixas UNITED STATES 3Stewart mine, Pala district, California...pucherite, U-minerals Hydrothermal quartz vein Lodi #4 mine, near Chilcoot, California Bismite, bismutite, |  | | Journal (issue) | | Pyromorphite from the Bunker Hill mine, Idaho; Wulfenite from the Red Cloud mine, Arizona; Calcite and Fluorite...Fluorite from the Elmwood mine, Tennessee; Aquamarine from Pakistan; Wire Silver from Kongsberg, Norway;...in Calcite from the Tsumeb mine, Namibia; Novacekite from the Brumado mine, Brazil; Elbaite from Nuristan...from Mogok, Burma; and Emerald from the Coscuez mine, Colombia. OUTSIDE BACK COVER: Beryl crystals: heliodor...aquamarine (right), 5.1 inches, from the Pioniera mine, Minas Gerais, Brazil; Freilich Collection. ♦ 4 |  | | Book (edition) | | Linopolis, Brazil, H Page 13: Gold, 35 mm.Eagle's est Mine, California, G Publi!>hed by Grdllit.u.o. Stefanikova43...abbreviated, e.g. canton (Switzerland), vilayet (Turkey), region (Chile), kray and oblast (Russia). The country...by Mobutu, and is now the Katanga administrative region again. The former Kivu province is now divided...United States or of the Upper Silesian historical region in Poland, where the importance of ore-bearing...Rice, Dolores co., both Colorado, at the Questa mine, Taos co., New 1994. Abernathyite K2[(UOJ 2l(AsO_J2]•6HzO |  | | Journal (issue) | | (thumbnail to miniature size) from the Eagle’s Nest mine in Placer County, California (half of them with...Rose” rhodochrosite specimen from the Sweet Home mine (pictured in vol. 24, no. 3, p. 228, Fig. 24), and...(Khomyakov et al., 1981), the Aris phonolite, Namibia (Von Knorring and Franke, 1987), M ont Saint-Hilaire...ountains, Russia (Bpggild, 1913) and Gjerdingen, Oslo Region, Norway (Raade and Haug, 1980). The drusy crusts...also been reported from the Aris phonolite in Namibia (Von Knorring et al., 1992), from M ont Saint-Hilaire |
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Namgar Mine, Usakos, Karibib Constituency, Erongo Region, Namibia