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The chemical formula of mineral Bergslagite is indicated by CaBe(AsO4)(OH). Mineral Bergslagite is most commonly found in thin veins in pieces of hematite ore found on mine dumps from a metamorphosed Fe-Mn orebody. Mineral Bergslagite is most commonly found at its type of locality at Langban, Varmland, Sweden. Mineral was named for the occurrence at Langban, which is in the Bergslagen region of Sweden. Bergslagite 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 Bergslagite has no cleavage displayed even if the mineral is evaluated closely with the aid of polarizing microscope used in the field of optical mineralogy. This mineral is commonly found colorless, gray, gray white or white in hand sample. The specific gravity measure of mineral Bergslagite is usually found 3.4 grams per cubic centimeters. Most crystals of mineral Bergslagite are found translucent in appearance. It is also commonly found showing uneven fracture showing flat surfaces, not the cleavage, fractured in an uneven pattern. The hardness measure of mineral Bergslagite when it is evaluated using the Mohs scale method is usually found 5. Mineral Bergslagite is most commonly found exhibiting vitreous to glassy luster when evaluated in reflected light of polarizing microscope. Mineral Bergslagite is also most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Mineral Bergslagite is also commonly found showing biaxial negative figure when evaluated between crossed nicols of polarized microscope used in the field of optical mineralogy. It is also commonly found showing 0.0350 birefringence. Bergslagite is a non-radioactive mineral.



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Sunday, October 24th, 2010 at 2:55 am
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Optical Mineralogy
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