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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical formula of mineral Boralsilite is indicated by Al16B6Si2O27. Boralsilite is most commonly found in a tourmaline – quartz intergrowth in granitic pegmatite cutting granulite-facies metapelitic rocks, and also known to be structurally related to sillimanite. Boralsilite is also commonly found at its type of locality at Stornes Peninsula, Larsemann Hills, Prydz Bay, East Antarctica. Boralsilite can be also found at Almgjotheii in the aureole of the Rogaland intrusive complex, southwestern Norway. Boralsilite was named after its composition of (bor}on, (al)uminum, and (sil)icon. Boralsilite 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.

            Boralsilite is most commonly found showing fair cleavage in two directions. All of which can be found more clearly exhibited when viewed closely under polarizing microscopes used in the field of optical mineralogy. Boralsilite is usually found white or colorless in hand sample which is more interesting when viewed under polarized microscope for mineralogists. Mineral Boralsilite is usually found showing 3.06 grams per cubic centimeters density. Most crystals are found transparent in appearance. The crystal habit of the mineral as described in the field of optical mineralogy usually includes aggregates which is made of numerous individual crystals or clusters that are more fascinating when viewed under petrographic polarizing microscope. It can be also found fibrous with crystals made up of fibers. Boralsilite is commonly found exhibiting vitreous or glassy luster when viewed in reflected light of polarizing microscopes used in optical mineralogy. Mineral Boralsilite is usually found leaving white streak when rubbed on white porcelain streak plate. Boralsilite is found to be showing biaxial positive figure when evaluated between crossed nicols of polarized microscope used in the field of optical mineralogy. It is also commonly found showing 0.0250 birefringence and very weak dispersion. Boralsilite is found to be non-radioactive after chemical evaluation.



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Saturday, February 19th, 2011 at 7:56 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope