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The chemical composition of mineral Borocookeite is indicated by the formula Li(1+3x)Al(4-x)(BSi3)O10(OH,F)8 [x = 0-0.33]. Borocookeite is usually found at a late stage pocket species in tourmaline-rich miarolitic pegmatites. This mineral is usually found at its type of locality at Malkhan gem tourmaline deposit, Central Transbaikalia, Russia. Mineral Borocookeite was named as the boron-rich analog of cookeite. Borocookeite 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 Borocookeite is usually found showing perfect cleavage in one direction which can be found more clearly visible when viewed closely under polarized microscopes for mineralogists. Borocookeite crystals are usually found colored light pinkish gray in hand sample. The specific gravity measure of mineral Borocookeite is usually found 2.62 grams per cubic centimeters. Most Borocookeite crystals are found opaque to translucent in appearance. Mineral Borocookeite is also most commonly found with flexible fracture showing flexible fragments. The crystal habit of mineral Borocookeite as described in optical mineralogy usually includes aggregate forms which is made up of numerous individual crystals or clusters. It can be also found showing flakes that are flat, thin crystals or aggregates. All of which can be found more clearly exhibited under petrographic polarizing microscope used in the field of optical mineralogy. The hardness measure of mineral Borocookeite as described in the field of optical mineralogy is usually found 3. Borocookeite is also commonly found showing greasy or oily luster when viewed in reflected light of polarizing microscopes for mineralogists. Borocookeite is also most commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Borocookeite is commonly found showing biaxial figure when viewed closley between crossed nicols of polarizing microscopes used in the field of optical mineralogy. It is also commonly found showing 0.0170 birefringence. Borocookeite is found to be not radioactie after chemical evaluations.



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Saturday, February 19th, 2011 at 7:54 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope