 | | Journal (issue) | | range of emeralds and green beryls from Central Nigeria. Detailed work on inclusions, compositions of hosts...549 1.549 23 23 23 23 1.540 1.560 1.561 1.583 Fluorite Opal Natrolite Petalite Leucite Oligoclase Quartz...deposits are exploited, e.g. in Australia, Thailand, Nigeria and China (Coenraads, 1992a; Guo et al., 1992)...on sapphire from other basaltic origins (e.g. Nigeria and Australia). She described as significant morphological...Harding, R.R., 1990. Gemstone prospects in Central Nigeria. Journal of Gemmology, 22, 4,195-202 Karr, c., |  | | 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) | | .......................................... 39 Nigeria.................................................. Israel; Tom Cushman, Madagascar; Linus Adie, Nigeria; Bill Larson, USA; Veronica Shkarina, Moscow, Russia;...of the stones to list are tourmaline, apatite, fluorite, diopside, kyanite, idocrase, iolite, sillimanite...Grande do Norte (Quintos and Mulungu) in Brazil and Nigeria (Edeko). As far as we could ascertain at the time...amethyst a year. C olored gemstones mined in Nigeria include beryl (aquamarine, emerald, heliodor, and |  | | 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) | | together by brass/gold-colored strips. 30 Figure 33. Fluorite on smoky quartz, 2.6 cm, from Frunthorn, Lake...in 2016); Anton Watzl, Sr. photo. Figure 82. Fluorite, 2.7 cm, from the Shangbao mine, Hengyang, Hunan...Jingnan Zhang photo. Figure 83. Spessartine with fluorite on feldspar and smoky quartz, 2.8 cm, from Tongbei...collection; Jeff Scovil photo. Figure 86 (above). Fluorite on Ferberite, 3.2 cm, from the Yaogangxian mine...99 Fluor-buergerite 110 Fluorcalciomicrolite 68 Fluorite 79, 104, 118 Fluor-liddicoatite 68 Gaudefroyite |  | | Journal (issue) | | and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America...from southern Tanzania; spessartine garnet from Nigeria and Namibia; exceptional peridot from Pakistan;...Pakistan; and pink to red tourmalines from Nigeria and Brazil. Diamond was mined in northern Canada for the first...cutting and reexport). The African sources were Nigeria, Mozambique (figure 3), Zambia, and Madagascar...from Namibia declined at the end of the 1990s, Nigeria provided larger and cleaner spessartines to Figure |  | | Book (edition) | | named according to chemical composition (e.g. fluorite). to crystallographic tenns (e .g. prismatine)...to reflect the light gypsum. 3 - calcite, 4 - fluorite, 5 - apatite, 6 - ortho- beam on the polished...example, the genesis of Pb-Zn ore deposits or fluorite deposits of the central United States or of the...) = 49°, (+). Rare in cavities with celestine, fluorite, and jarlite in cryolite pegmatite at Ivigtut...Granular aggregates composed of crystals nechnoye kam fluorite depo'>it.near Qara-Oba, S of resembling trigonal |  | | Book | | if they appear to be another color. The mineral fluorite, for example, can appear as purple, blue green...them are not equal: r Talc r Gypsum r Calcite r Fluorite r Apatite r Orthoclase r Quartz r Topaz r Corundum...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 |  | | Journal (issue) | | (Chivor) Huong et al. (2010) Colombia (Chivor) Nigeria (Gwantu) China (Malipo) I3598/I3607 Brazil (Santa...a scratch test on each sample using a piece of fluorite (Mohs hardness = 4), and as expected it was easier...for comparison. Scratch testing with a piece of fluorite was successful at inscribing the letter ‘F’ on...data. The three localities—Brazil, Mozambique and Nigeria— were correctly identified with over 95% accuracy... Economy, and Artistic Expression in Ile-Ife, Nigeria 25 October 2022 • Usha Balakrishnan—Minakari: |
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Gwantu, Kaduna, Nigeria