 | | Journal (issue) | | range of emeralds and green beryls from Central Nigeria. Detailed work on inclusions, compositions of hosts...deposits are exploited, e.g. in Australia, Thailand, Nigeria and China (Coenraads, 1992a; Guo et al., 1992)...1986) such as rutile (TiOz), hematite (FeZ0 3) or ilmenite (FeTi03). As many natural sapphires exhibit growth...on sapphire from other basaltic origins (e.g. Nigeria and Australia). She described as significant morphological...sapphires, have been Ti and Te oxides: rutile, ilmenite and hematite These inclusions are very common |  | | Journal (issue) | | from Transvaal); Zambia (30 from Kafubu); Nigeria (30 from Gwantu); and China (10 from Malipo). The 66 faceted...(Kafubu, Zambia). The exact posi- Colombia (Ch) 68 Nigeria (Gw) China (Ma) Brazil (ST) Brazil (So) Brazil...GEMOLOGY WINTER 2014 289 68 Colombia (Ch) Nigeria (Gw) China (Ma) 67 Brazil (ST) Brazil (So) Brazil...306±0.284 0.405±0.053 Nigeria/Gwantu 1 66.254±0.168 0.208±0.021 Nigeria/Gwantu 2 66.188±0.056 0.142±0...142±0.018 Nigeria/Gwantu 3 64.986±0.409 0.230±0.041 Nigeria/Gwantu 4 65.755±0.220 0.208±0.035 Nigeria/Gwantu |  | | Report (issue) | | Dietmar Schwarz and Gaston Giuliani Africa: Egypt, Nigeria, Tanzania, . . . . . . . . .52 Mozambique, Zambia...with the free growing emeralds from Colombia, Nigeria and Afghanistan. According to the skill (or lack...Pegmatite Vugs (e.g., Kaduna, Plateau States, Nigeria) The mineralizations of the Kaduna and Plateau Provinces...Provinces in Nigeria are associated with two periods of magmatism and the accompanying intrusion of alkali...-·.:::.: - ... . **�;ii)/_:-,; . • • . e.g., Nigeria Overview (width of about 20 meters) The roof zone |  | | Journal (issue) | | Spring 2006 “Paraíba”-type Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting by LA-ICP-MS...Africa (Transvaal—30), Zambia (Kafubu—30), Nigeria (Gwantu—30), and China (Malipo—10). In addition, 66...678 0.396 Nigeria/Gwantu 1 Nigeria/Gwantu 2 Nigeria/Gwantu 3 Nigeria/Gwantu 4 Nigeria/Gwantu 5 0.093...(A and B, representing samples from Austria and Nigeria, respectively) show two Raman bands, at 3608 and...PEAK INTENSITY VS. ALKALI COMPOSITION 5 ● Nigeria (Gwantu) ✺ ❖ China (Malipo) ❍ ✚ Brazil (Santa Terezinha) |  | | Journal (issue) | | located in Tanzania in 2005 (Laurs, 2006), while Nigeria developed into an important source for pink tourmaline...cuprian tourmaline was discovered near Edeko, Nigeria, though this material did not have quite the same...International: New find of pink-to-red tourmaline in Nigeria. G&G, Vol. 45, No. 4, p. 305. Laurs B.M., Zwaan...192–215. Smith C., Bosshart G., Schwarz D. (2001) Nigeria as a new source of coppermanganese-bearing tourmaline...Brazil as well as new sources in Mozambique and Nigeria. In cultured pearls, Chinese products have come |  | | Book (edition) | | or tabular, and pseudomorphs after titanite or ilmenite. Anatase may be replaced by rutile. Cleavage {001}...clays with an average of 8 wt% TiO2 . It cements ilmenite sandstones at Bothaville, Free State, South Africa...tin-bearing ring granite bodies of the Jos Plateau, Nigeria, mainly at Timber Creek, near Jos, and also at...Brazil, mentioned above, also at Antan, near Jemaa, Kaduna State, where fine Beryl - morganite with verdelite...topaz crystals in Delimi R., Bauchi State, both Nigeria. Blue aquamarine is common in alluvial gemstone |  | | Book | | Lower indices are seen in emeralds from Colombia, Nigeria, Australia, and (of all places) Norway. These stones...are found in Madagascar, Mozambique, Russia, and Nigeria, in addition to Brazil. These emeralds may also...Madagascar, Malawi, Mozambique, Nigeria, Somaliland, and Tanzania. In Nigeria (Gwantu region), hydrothermal fluids...emerald associated with aquamarine and tourmaline. Nigeria also has a quantity of large and lovely green beryl;...ranges from very pale greenish blue to light blue. Nigeria will just have to be satisfied with its aquamarine |
|
