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The chemical formula of mineral Jurbanite is indicated by Al(SO4)(OH)•5(H2O). this mineral is usually found occurring at secondary crusts in humid tunnels in oxidized portions of sulfide deposits in aluminous rocks. This is apparently deposited directly from mine water at about 27 deg C and 100% humidity. Mineral Jurbanite is commonly found from its type of locality at San Manuel mine, Mammoth district, Pinal Co., Arizona, USA. Mineral Jurbanite was named for Joseph John Urban (1915-1997) ofTucson, Arizona, USA, a mineral collector who first observed the natural material. Jurbanite 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 Jurbanite has no cleavage found even when mineral is evaluated closely with the aid of petrographic polarizing microscope for mineralogists. Mineral Jurbanite is also found with colorless appearance in hand sample. The density measure of mineral Jurbanite is usually found 1.786 grams per cubic centimeters. Most crystals of mineral Jurbanite are found transparent in appearance. Jurbanite crystals are also found brittle in structure and this is generally displayed by glasses and most non-metallic minerals. The hardness measure of mineral Jurbanite is usually found 2.5 when evaluated using the Mohs scale method. Jurbanite is commonly exhibiting vitreous or glassy luster when evaluated in reflected light of polarizing microscope for mineralogists. Jurbanite is also found leaving a white streak when rubbed on white porcelain streak plate. This mineral is known to have biaxial negative figure with 0.0240 birefringence when specimen is evaluated between crossed nicols of polarizing microscope for mineralogists. Mineral Jurbanite is also found not radioactive when chemically evaluated.



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Thursday, December 29th, 2011 at 8:59 am
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Optical Mineralogy
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