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The chemical formula of mineral Cobaltaustinite is indicated by CaCo(AsO4)(OH). Cobaltaustinite is considered as a rare secondary mineral in the oxidized zone of a copper deposit. Considered as well as an alteration product of arsenides. Cobaltaustinite is commonly found occurring at Dome Rock copper mine, about 40 km northwest of Mingary, South Australia. Mineral Cobaltaustinite was named for its content of cobalt and similarity to austinite. Mineral Cobaltaustinite 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. Cobaltaustinite has no cleavage display even when mineral is evaluated closely with the aid of polarizing microscope for mineralogists. Mineral Cobaltaustinite is commonly found colored green in hand sample. Most crystals of mineral Cobaltaustinite are found translucent in appearance. The hardness measure of mineral Cobaltaustinite is usually found is 4.5 when evaluated using the Mohs scale method. Mineral Cobaltaustinite is commonly found showing earthy luster when evaluated closely in reflected light of polarizing microscopes. Mineral Cobaltaustinite is commonly found leaving a light green streak when rubbed on white porcelain streak plate. Mineral Cobaltaustinite is commonly found showing biaxial positive figure with 0.0250 birefringence found when evaluated between crossed nicols of petrographic polarizing microscope used in the field of optical mineralogy. Mineral Cobaltaustinite is found to be not radioactive.

 



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Wednesday, August 31st, 2011 at 4:37 am
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Optical Mineralogy
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