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The chemical formula of mineral Arsenobismite is indicated by Bi2(AsO4)(OH)3. Arsenobismite is usually found at an oxidized ore at the 200 m level. It is said to be an inadequately described species. Arsenobismite was discredited as being a preisingerite-rich concentrate with atelestite and beudantite. Arsenobismite is most commonly found at Mammoth mine, Tintic District, Utah, USA. This mineral was named in 1916 for its composition. Arsenobismite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths.

            Arsenobismite is usually found colored green, yellowish green, or brownish green that could be more fascinating when viewed with the aid of petrographic polarizing microscope used in the filed of optical mineralogy. The specific gravity measure of the mineral is usually found 5.7 grams per cubic centimeters. The crystal habits of mineral Arsenobismite as described in the field of optical mineralogy usually include cryptocrystalline form occuring as crystals too small to distinguish with the naked eye, friable or loosley cohesive material that granulates with your fingers and pulverulent which forms a loose, poorly-coherent powdery mass. The hsrdness measure of the mineral is usually found 3 when it is evaluated using the Mohs scale method. Arsenobismite is a non-fluorescent mineral as evaluated. It is also a non-magnetic mineral as evaluated. Arsenobismite is usually found leaving a greenish yellow streak when rubbed on white porcelain streak plate. Arsenobismite is an isotropic mineral as evaluated in the field of optical mineralogy. This means that Arsenobismite has no power to produce any illumination and they are usually found singly refracting and consequently are found quite dark between crossed nicols of polaried microscope used in the field of optical mineralogy. Arsenobismite is a non-radioactive mineral as evaluated.



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Friday, July 16th, 2010 at 10:17 am
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Optical Mineralogy
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