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The chemical formula of mineral Arseniosiderite is inicated by Ca2Fe+++3(AsO4)3O2•3(H2O). Arseniosiderite is usually found occuring as a rare secondary mineral formed by the oxidation of earlier arsenic-bearing minerals, typically scorodite or arsenopyrite. Mineral Arseniosiderite is most commonly found at its type of locality at Romaneche, Saone-et-Loire, France. It can be also found at Huttenberg, Carinthia, Austria as well as in Germany, at Schneeberg, Saxony, and at Wittichen and Neubulach, Black Forest. This mineral was named for essential “arsenic” in the composition, and “sideros,” Greek for “iron.” Arseniosiderite is known to crystallie 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.

           

            Arseniosiderite is usually found showing good cleavage in one direction when viewed with the aid of petrographic polarizing microscope used in the field of optical mineralogy. It is most commonly found colored bronze brown, yellow, yellow brown, dark brown, or black that could appear more interesting when viewed with the aid of polariing light microscope used in the field of optical mineralogy. The specific gravity measure of the mineral is usually found 3.7 grams per cubic centimeters. Most crystals of mineral Arseniosiderite are found translucent to opaque in appearance. The crystal habit of the mineral as described in the field of optical mineralogy usually includes fibrous form showing crystals made up of fibers. The hardness measure of the mineral Arseniosiderite when it is evaluated using the Mohs scale method is usually found between talc and gypsum which is most likely to be 1.5. Arseniosiderite is a non-fluorescent mineral as evaluated. This mineral is usually found exhibiting submetallic luster when viewed in reflected light of polarized microscope used in the field of optical mineralogy. It is most commonly found leaving an ochraceous streak when rubbed on a white porcelain streak plate. Mineral Arseniosiderite is most commonly found showing biaxial negative figure when evaluated between crossed nicols of polaried microscope used in the field of optical mineralogy. It is also usually found showing 0.0830 birefringence. Arseniosiderite is a non-radioactive mineral as evaluated.



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Friday, July 16th, 2010 at 10:15 am
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Optical Mineralogy
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