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The chemical formula of mineral Armenite is indicated by BaCa2Al6Si9O30•2(H2O). Mineral Armenite is usually found as a Silicate mineral that can be found in Barium-rich hydrothermal veins or fissures. This mineral is most commonly found at its type of locality at Armen Mine, Kongsberg, Norway. This mineral was named for its type of locality. Armenite 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. Armenite is most commonly found showing perfect cleavage in one direction and distinct in another, all of which can be seen more clearly visible when viewed with the aid of polarizing microscope used in the field of optical mineralogy. Armenite is most commonly found colorless, gray green, or white in hand samples. The specific gravity measure of mineral Armenite is usually found 2.76 grams per cubic centimeters. Most crystals of mineral Armenite are found translucent in appearance. Armenite is usually found showing brittle fracture when viewed under polarizing microscope. This is generally displayed by glasses and most non-metallic minerals. The hardness measure of mineral Armenite when it is evaluated using the Mohs scale method is usually found 7.5. It is also usually found showing vitreous or glassy luster when viewed in reflected light of polarized microscope. Armenite is most commonly found leaving a white streak when rubbed on white porcelain streak plate. Armenite is also commonly found showing biaxial negative figure when evaluated between crossed nicols of polarizing microscope used in optical mineralogy. It is also usually found showing 0.0060 birefringence. Armenite is a non-radioactive mineral as evaluated.



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Wednesday, June 30th, 2010 at 1:30 am
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Optical Mineralogy
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