They form during metamorphism of alumina-rich sediments. Production worldwide in 2013 was 440,000 tonne, mostly andalusite from South Africa, the bulk of which is used for manufacture of mullite (Al 6 Si 2 O 13) refractories. Conversion to mullite and silica takes place on heating to temperatures in the range 1250–1650°C.
Geological Society of South Africa, PO Box 44283, Linden 2104, South Africa.. The Geological Society of South Africa, 136 pp. Data: Mineral Data: Click here to view Sillimanite data: Locality Data: Click here to view Aggeneys, Namakwa District Municipality, Northern Cape, South Africa: Localities for Sillimanite in this Region: Broken Hill Mine ...
South Africa, whereas mining of these minerals is controlled by five major producers situated in South Africa (andalusite), USA (kyanite) and France (andalusite) (Fig. 1). The majority of sillimanite minerals produced in other countries such as Aus-tralia, Brazil, China, India, Ukraine and Zimbabwe is mostly for domestic consumption.
Andalusite is also produced in France, India, the Republic of South Africa, and Spain (Fig. 1). Sillimanite is produced in Australia, Brazil, India, Spain, and the Republic of South Africa; the former USSR is also thought to be a major producer (Fig. 1). Some of the countries produce only for domestic use.
Sillimanite from Northern Cape, South Africa. South Africa . Northern Cape; Namakwa District Municipality
• Sillimanite • Oligoclase • Spodumene • Gypsum • Tektites • Shell . If you are interested in buying gemstones in South Africa you need to look out for the following: How to buy gemstones in South Africa 1. Look at the background of the seller! 2. Look at the credentials of the seller! 3. Study the gemstone.
The minerals sillimanite, kyanite and andalusite are all aluminium silicates having the same chemical formula ... Production worldwide in 2013 was 440,000 tonne, mostly andalusite from South Africa, the bulk of which is used for manufacture of mullite (Al 6 Si 2 O 13) refractories. Conversion to mullite and silica takes place on heating to ...
Sillimanite is the mineral which forms at high temperatures and low to high pressure. Luster is vitreous to subadamantine, or silky. Its hardness is 7.0, with a white or colorless streak and a density of 3.2-3.3. Its fracture pattern is splintery, similar to kyanite. Cleavage is perfect. Naming and Discovery
Sillimanite was named in honor of Benjamin Silliman, a professor of mineralogy at Yale. It was previously called fibrolite. Sillimanite is found in South Africa, India, Germany (Bavaria), France, the Czech Republic, Scotland, United States (California, New York, Pennsylvania, South Carolina, Delaware, Connecticut, Massachusetts) and southeast Asia.
Faceted gems are usually small (under 5 carats) and quite rare. Catseye gems are generally in the same size range, up to 10 carats, may be black, yellow, or grayish green. Smithsonian Institution (Washington, D.C): 5.9 (black catseye, South Carolina). British Museum (Natural History) (London England): 35 (fibrolite).
1.13ct Oval Facet Yellow Sillimanite from Sri Lanka, Dimension 7.9 x 5.9mm, Natural untreated Gemstone, VVS-VS Clarity, 1 piece Sillimanite in Medium Yellow Color, Mohs Hardness of 6.5 - 7.5 suitable for daily wear jewelry. $4351. 7.9 x 5.9 mm. Item in Stock. Add to Cart.
Localities for Sillimanite in this Region Broken Hill Mine, Aggeneys, Namakwa District Municipality, Northern Cape, South Africa Gamsberg zinc mine, Aggeneys, Namakwa District Municipality, Northern Cape, South Africa Namies schist, Aggeneys, Namakwa District Municipality, Northern Cape, South Africa Nearest other occurrences of Sillimanite
Sillimanite (also known as Fibrolite) is found in various colours including green, yellow, brown, blue, white and even black. It is a 'polymorph' with two other minerals, Kyanite and Andalusite, which simply means that it shares the same chemistry but has a different crystal structure. ... South Africa, Korea, India, Madagascar, England and ...
Sillimanite - General information. Sillimanite - You find here 12 suppliers from Germany Nigeria Austria South Africa Pakistan and Poland. Please obtain more information on spare parts, servicing, maintenance, Repair, repair or accessories directly from the registered companies. Are you looking for Sillimanite.
South African manufacturers and suppliers of andalusite or kyanite or sillimanite from around the world. Panjiva uses over 30 international data sources to help you find qualified vendors of South African andalusite or kyanite or sillimanite.
Sillimanite. A brown sillimanite. Photo courtesy of Chaman Golecha, Gem Testing Laboratory, Jaipur. Sillimanite (also known as "fibrolite") is named after Benjamin Silliman (1779-1864). Silliman was the founder of the American Journal of Science (Silliman's Journal). It is polymorphous with Anadalusite and Kyanite.
Sillimanite, andalusite and kyanite constitute 2%, 74% and 24%, respectively, of the total tonnage pro- duced in 1998. South Africa accounted for 62% of this total whereas USA and France provided 23% and 11%, respec- tively (Table 2).
Sillimanite is the mineral which forms at high temperatures and low to high pressure. Luster is vitreous to subadamantine, or silky. Its hardness is 7.0, with a white or colorless streak and a density of 3.2-3.3. Its fracture pattern is splintery, similar to kyanite. Cleavage is perfect.