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The chemical formula of mineral Chesnokovite is indicated by Na2[SiO2(OH)2]•8H2O. Mineral Chesnokovite is commonly found in an ussingite vein uncovered by underground mining where it occurs as intergrowths with natrophospate in pockets. Chesnokovite is considered as a new structure type mineral which has the capability to alter to opal. Chesnokovite is usually found occuring at its type of locality at Karnasurt mine, Mountain Kedykverpakhk, Lovozero massif, Kola Peninsula, Russia. This mineral was named for B.V. Chesnokov (1928-2005), an outstanding mineralogist. Mineral Chesnokovite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Mineral Chesnokovite is commonly found showing perfect cleavage in one direction and distinct in two other directions, all of which can be found more clearly exhibited when evaluated closely under polarizing microscopes for mineralogists. Mineral Chesnokovite is usually found colorless, white or pale brownish yellow in hand sample. The density measure of mineral Chesnokovite is usually found 1.68 grams per cubic centimeters. Most crystals of mineral Chesnokovite are found transparent in appearance. The crystal habit of mineral Chesnokovite as described in the field of optical mineralogy usually includes stepped form with fractured surfaces that resemble stair case steps. Sometimes it can be also found deliquescent in form where crystals absorb water from the air and melt or otherwise deteriorate. It can be also found lamellar in form with thin laminae producing a lamellar structure. The hardness measure of mineral Chesnokovite is usually found 2.5 when evaluated using the Mohs scale method. Chesnokovite is also commonly found showing vitreous or glassy luster in reflected lighht of petrographic polarizing microscope. Chesnokovite is also mos commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Chesnokovite is also found showing biaxial positive figure with 0.0090 biirefringence when evaluated between crossed nicols of polarizing microscopes. Mineral Chesnokovite has a barely detectable radioactivity.



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Thursday, June 30th, 2011 at 3:20 am
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Optical Mineralogy
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