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The chemical formula of mineral Borcarite is indicated by Ca4MgB4O6(OH)6(CO3)2. Mineral Borcarite is usually found in kotoite marbles, near the contact with granodiorite. This mineral is commonly found at its type of locality at Snezhnoye boron deposit, Izvestkovyi stream, Tas-Khayakhtakh Range, Polar Ural Mountains, Russia. Borcarite was named for the BORate and CARbonate in the composition. Borcarite 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.

            Borcarite is usually found showing perfect cleavage in two directions which can be found more clearly visible when viewed closely under polarizing microscopes used in the field of optical mineralogy. Mineral Borcarite is also usually found with blue green, colorless, green or greenish blue in hand sample which can be more interesting when viewed closely under polarizing microscopes used in the field of optical mineralogy. Borcarite is also found with 2.77 grams per cubic centimeters density. The hardness measure of the mineral is usually found 4 when evaluated using the Mohs scale method. Borcarite is most commonly found showing vitreous to pearly luster when evaluated with the aid of polarizing microscopes for mineralogists. Mineral Borcarite is most commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Borcarite is usually found showing biaxial negative figure when evaluated between crossed nicols of polarized microscopes. It is also commonly found showing 0.0670 birefringence. Mineral Borcarite is found to be non-radioactive after chemical evaluation.



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Saturday, February 19th, 2011 at 7:42 am
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Optical Mineralogy
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