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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Denisovite is indicated by (K,Na)Ca2Si3O8(F,OH). This mineral is commonly occurring in nepheline syenite in a differentiated alkalic massif. Denisovite can be also found from its type of locality at Mts. Eveslogchorr and Yukspor, Khibiny massif, Kola Peninsula, and in the Murun massif, southwest of Olekminsk, Yakutia, Russia. Denisovite was named for Aleksander Petrovich Denisov (1918-1972), Russian specialist in X-ray investigations of minerals, of the Kola Scientific Center, Russia. Denisovite 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. It has indistinct cleavage on one direction which can be more clearly visible when viewed with the aid of polarizing microscope for mineralogists. Denisovite is also found showing greenish gray or gray color in hand sample. Mineral Denisovite is known to have a density measure of 2.76 grams per cubic centimeters. Denisovite crystals are found to be brittle in structure. This is generally displayed by glasses and most non-metallic minerals. The hardness measure of Denisovite is usually found ranging from 4 to 5 when evaluated using the Mohs scale method. It is also found exhibiting pearly luster in reflected light of polarizing microscope. It is also leaving a gray white streak when rubbed on white porcelain streak plate. Denisovite has biaxial positive figure and 0.0090 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Denisovite is known to have barely detectable radioactivity after chemical evaluation.



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Tuesday, January 31st, 2012 at 5:26 am
Category:
Optical Mineralogy
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