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The chemical formula of mineral Betekhtinite is indicated by Cu10(Fe,Pb)S6. Betekhtinite is commonly found in veins cutting the black cupriferous shale at Mansfeld, Germany. This mineral is usually found at its type of locality at the Mansfeld Kupferschiefer, Eisleben, and at Waschenback, Odenwald, Germany. This mineral was named for Anatolii Gergievich Betekhtin (1897-119620, Russian mineralogist and economic geologist. Mineral Betekhtinite 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 Betekhtinite is usually found showing distinct cleavage in three directions which can be found more clearly visible when viewed closely under polarizing light microscope used in the field of optical mineralogy. This mineral is most commonly found colored brownish black in hand sample. The specific gravity measure of mineral Betekhtinite is usually found ranging from 5.996 to 6.05 grams per cubic centimeters giving an average of 6 grams per cubic centimeters. Most crystals of mineral Betekhtinite are found opaque in appearance. The crystal habit of mineral Betekhtinite is usually found acicular in form occuring as needle-like crystals when viewed closely under petrographic polarizing microscope. The hardness measure of mineral Betekhtinite when it is evaluated using the Mohs scale method is usually found 3. Betekhtinite is also usually found showing metallic luster when viewed closely in reflected light of polarized microscope used in the field of optical mineralogy. Betekhtinite is most commonly found leaving a black streak when rubbed on white porcelain streak plate. Betekhtinite is also commonly found anisotrophic showing strong, distinctly colored. The interference color of mineral Betekhtinite  is usually found bright cream parallel to elongation, stronger yellowish cream perpendicular. Betekhtinite is a non-radioactive mineral as evaluated.



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Friday, November 26th, 2010 at 3:29 pm
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Optical Mineralogy
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