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The chemical formula of mineral Calvertite is indicated by Cu5Ge0.5S4. Mineral Calvertite commonly occurs in a granular texture formed by a network of chalcocite veins. Mineral Calvertite is most commonly found at its type of locality at Tsumeb, Namibia. Mineral Calvertite was named for Lauriston (Larry) Derwent Calvert (1924-1993) of the National Research Council, Ottawa, Canada. Calvertite is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Calvertite has no cleavage display even if evaluated closely with the aid of polarizing microscpoe used in the field of optical mineralogy. Mineral Calvertite is usually found colored black in hand sample. Most crystals of mineral Calvertite are found opaque in appearance. Mineral Calvertite is usually found showing conchoidal or irregular fracture under petrographic polarizing microscope used in optical mineralogy. Irregular fracture is usually found producing small, conchoidal fragments. The crystal habit of mineral Calvertite as described in the field of optical mineralogy usually includes granular forms which is generally occuring as anhedral to subhedral crystals in matrix. The hardness measure of mineral Calvertite is usually found 4.5 when closely evaluated using the Mohs scale method. Mineral Calvertite is usually found exhibiting metallic luster in reflected light of polarized microscope for mineralogists. No anisotrophism found when mineral was examined closely with the aid of petrogrhic polarizing microscopes used in opical mineralogy. No bireflectance found as well. The interference color exhibited by the mineral is usually found pale bluish gray. Calvertite is found to be not pleochroic. Calvertite is also found to be not radioactive after chemical evaluation.



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Friday, April 29th, 2011 at 7:31 am
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Optical Mineralogy
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