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The chemical formula of mineral Berborite is indicated by Be2(BO3)(OH,F)•(H2O). Mineral Berborite is usually found at serpentinized dolostone associated with W-Sr-B-Be-bearing skarns. Berborite is most commonly found at its type of locality at Luppikko deposit, Pitk¨aranta district, Lake Ladoga, Karelia, Russia. This mineral was named for the BERyllium and BORate in the composition. Mineral Berborite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes.

            Mineral Berborite is commonly found exhibiting perfect cleavage when viewed closely under polarizing light microscope used in the field of optical mineralogy. Mineral Berborite is most commonly found colorless in hand sample. Most mineral Berborite crystals are found transparent in appearance. The specific gravity measure of mineral Berborite is usually found 2.2 grams per cubic centimeters. Mineral Berborite is most commonly found showing uneven fracture when evaluated closely under polarized microscope used in the field of optical mineralogy. These are actually flat surfaces, not cleavage, that are fractured in an uneven pattern. The hardness measure of mineral Berborite is usually found 3, when mineral is evaluated using the Mohs scale method. Mineral Berborite is also most commonly found exhibiting vitreous or glassy luster when evaluated closely under polarized microscope. Mineral Berborite is also most commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. Mineral Berborite is also most commonly found showing uniaxial negative figure when mineral is evaluated between crossed nicols of polarizing microscope used in the field of optical mineralogy. Berborite is also commonly found showing 0.0950 birefringence. Berborite is a non-radioactive mineral as evaluated.



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Sunday, October 24th, 2010 at 2:58 am
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Optical Mineralogy
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