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The chemical formula of mineral Aristarainite is indicated by Na2MgB12O20•8(H2O). Aristarainite is usually found at Playa evaporite sequence. It is also most commonly found at its type of locality at Tincalayu borax deposit, Salar del Hombre Muerto, Salta Province, Argentina. The mineral was named for Lorenzo Francisco Aristarain (1926- ), Argentine mineralogist specializing in borate deposits, La Plata University, Buenos Aires, Argentina. Aristarainite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. Aristarainite is usually found showing perfect cleavage in two direction and good in the other. This can be observed more clearly under petrographic polarizing light microscope used in the field of optical mineralogy. Aristarainite is commonly found colorless. The specific gravity measure of the mineral is usually found 2.027 grams per cubic centimeters. Most crystals of mineral Aristarainite are found transparent in appearance. The hardness measure of mineral Aristarainite when it is evaluated using the Mohs scale method is usually found 3.5. Aristarainite is usually found showing vitreous or glassy luster when viewed in reflected light of polarized microscope for mineralogists. It is also most commonly found leavaing a white streak when rubbed on white porcelain streak plate. Aristarainite is usually found showing biaxial posotive figure when evaluated between crossed nicols of polarizing microscope for mineralogists. It alsos exhibit a 0.0390 birefringence. Aristarainite is a non-radioactive mineral as evaluated.



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Wednesday, June 30th, 2010 at 1:26 am
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Optical Mineralogy
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