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The chemical composition of mineral Bykovaite is indicated by the formula BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O. Bykovaite is usually found occuring in pegmatite vein consisting of a central ussingitic core surrounded by a zone of mostly microcline and aegirine at the margins, and lies in poikilitic nepheline-sodalite syenite. This mineral is a Hete rophyllosilicate pseudomorphous after. Bykovaite is most commonly found at its type of locality at Alluaiv, Lovozero Massif, Kola, Russia. Bykovaite was named to honor analytical chemist Alexandra Vasilyevna Bykova (1917-2001), who first discovered that bornemanite could be transformed to a synthetic form of bykovaite upon treatment with water. Mineral Bykovaite 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 Bykovaite is usually found with perfect in one direction and imperfect in the other, all of which can be noticed more readily when viewed with the aid of polarizing microscopes for mineralogists. Bykovaite is usually found colored creamy yellow or pale yellow in hand sample. The density measure of the mineral is usually found 2.98 grams per cubic centimeters. Most Bykovaite crystals are found semitransparent in apperance. Bykovaite is usually found with brittle to splintery fracture when viewed under polarized microscopes. Brittle fracture is commonly leaving splintery fragments. The crystal habit of mineral Bykovaite as described in the field of optical mineral usually includes spherical forms showing spherical, rounded aggregates. The hardness measure of mineral Bykovaite is usually found 3 when evaluated using the Mohs scale method. It is also most commonly found showing silky luster when evaluated in reflected light of polarizing microscopes for mineralogists. Bykovaite is commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Bykovaite is usually found showing biaxial figure when evaluated between crossed nicols of polarizing microscopes. It is also commonly found showing 0.0420 birefringence. Bykovaite has a barely detectable radioactivity.



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Friday, April 29th, 2011 at 8:13 am
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Optical Mineralogy
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