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The chemical formula of mineral Arsendescloizite is indicated by PbZn(AsO4)(OH). Arsendescloizite is most commonly found occuring as a secondary mineral in oxidized hydrothermal polymetallic deposits. Arsendescloizite is usually from its type of localities at Tsumeb, Namibia as well as in the Gejiu Pb-Zn deposit, not otherwise located, China. It can be also found from the Toroku mine, Miyazaki Prefecture, Japan. The mineral was named as the arsenate analog of “descloizite.” Mineral Arsendescloizite 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.

            Mineral Arsendescloizite has no cleavage display even if it is evaluated closely with the aid of polarized microscope used in the field of optical mineralogy. Arsendescloizite is commonly found colored light yellow and dark green when viewed closely under polarizing microscope used in the field of optical mineralogy. The specific gravity measure of the mineral is usually found 6.57 grams per cubic centimeters. Most crystals of mineral Arsendescloizite are found transparent in appearance. The hardness measure of the mineral when evaluated using the Mohs scale method is usually found 4. Mineral Arsendescloizite is usually found exhibiting subadamantine luster when viewed in reflected light of polarizing microscope for mineralogists. It is also most commonly found leaving a white streak when rubbed on white porcelain streak plate. Arsendescloizite is commonly found showing biaxial negative figure when evaluated between crossed nicols of polarizing microscopes. It also shows 0.0450 birefringence. Arsendescloizite 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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