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The chemical formula of mineral Beusite is indicated by Mn2+1.8Fe2+0.7Ca0.3Mg0.2(PO4)2. This mineral is usually found as a late-stage accessory mineral in complex granite pegmatites and as euhedral inclusions in troilite nodules in an iron meteorite. Mineral Beusite is commonly found at its type of locality at Los Aleros pegmatite, Argentina. This mineral was named for Alexey Alexandrovich Beus, Professor of Mineralogy and Geochemistry, Moscow Polytechnical Institute. Mineral Beusite 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.

            Mineral Beusite is usually found showing good cleavage in one direction and distinct in one direction which can be found more clearly visible when viewed closely with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Mineral Beusite is commonly found colored reddish brown in hand sample. The specifc gravity measure of mineral Beusite is commonly found ranging from 3.6 to 3.7 grams per cubic centimeters giving an average of 3.65. Most crystals of mineral Beusite are found translucent in appearance. The hardness measure of mineral Beusite when it is evaluated closely using the Mohs scale method is usually found 5. The crystal habit of mineral Beusite as described in the field of optical mineralogy usually includes lamellar forms with thin laminae producing a lamellar structure. It can be also found showing prismatic forms with crystals shaped like slender prisms when viewed under polarizing microscope. Mineral Beusite is also commonly found showing vitreous luster when viewed closely in reflected light of polarizing microscope used in the field of optical mineralogy. Mineral Beusite is also commonly found leaving a light pink streak when rubbed on white porcelain streak plate. Beusite is also usually found showing biaxial positive figure when viewed closely between crossed nicols of polarized microscope used in the field of optical mineralogy. It is also commonly found showing 0.0150 birefringence and strong dispersion. Beusite is a non-radioactive mineral as evaluated.



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Friday, November 26th, 2010 at 3:32 pm
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Optical Mineralogy
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