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The chemical formula of mineral Jedwabite is indicated by Fe7(Ta,Nb)3. Jedwabite was first discovered in platiniferous placers in the Nizhnetagilsky District in the Middle Urals, in a collection made by P. Walther at the beginning of the 20th century, in association with niobocarbide and a tantalum carbide. Mineral Jedwabite is commonly found at its type of locality at Nijniy-Tagil, near Solovjeva mountains (formerly Aurorinsky mine) and Baranchinsky massif near the Aktai River, Middle Urals, Russia. Mineral Jedwabite was named for Jacques Jedwab, Universite Libre de Bruxelles, Belgique, in recognition of his meticulous investigations of the mineralogy of placers and of carbides in natural environments. Mineral Jedwabite is known to crystallize in the hexagonal system of crystal formation.  Jedwabite has no cleavage display found even when evaluated closely with the aid of petrographic polarizing microscopes. Jedwabite is usually found colored grayish yellow in hand sample. The density measure of mineral Jedwabite is commonly found 8.6 grams per cubic centimeters. Most crystals of mineral Jedwabite are found opaque in appearance. Jedwabite is usually found showing brittle fracture. This is generally displayed by glasses and most non-metallic minerals. The crystal habit of mineral Jedwabite as described in the field of optical mineralogy usually includes granular form. This is generally occurring as anhedral to subhedral crystals in matrix. The hardness measure of this mineral is usually found 7 when evaluated using the Mohs scale method. This mineral is commonly found showing metallic luster when evaluated closely in reflected light of polarizing microscopes for mineralogy. It has negligible anisotrophism and bireflectance. The interference color of mineral Jedwabite is usually found grayish white in color. Jedwabite is not pleochroic. Jedwabite is found to be not radioactive.



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Friday, September 30th, 2011 at 1:42 am
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Optical Mineralogy
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