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The chemical formula of mineral Avdoninite is indicated by K2Cu5Cl8(OH)4•H2O. Avdoninite is usually found forming at fumarole exhalation sediments. It is actually most commonly found at its type of locality at Yadovitaya fumarole in the Second Cinder Cone at the Northern Breach of the Great Fissure Tolbachik Eruption, Tolbachik volcano, Kamchatka Peninsula, Russia. Mineral Avdoninite was named for Vladimir Nikolaevich Avdonin (b 1925), a senior researcher of the Ural Geological Museum of the Ural State Mining University. Avdoninite is also 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. Avdoninite is most commonly found colored green in hand sample. The specific gravity measure of mineral Avdoninite is actually commonly found 3.03 grams per cubic centimeters. Most crcystals of mineral Avdoninite is most commonly found transparent in appearance. Mineral Avdoninite is usually found showing brittle fracture. This is generally displayed by glasses and most non-metallic minerals. It can be also found in druse form showing crystal growth in a cavity which results in numerous crystal tipped surfaces, which can be found more interesting when viewed closely under polarizing light microscope used in the field of optical mineralogy used in the field of optical mineralogy. It can be also found showing prismatic forms with crystals shaped like slender prisms. Sometimes it can be also found tabular in form showing dimensions are thin in one direction. The hardness measure of mineral Avdoninite when it is evaluated using the Mohs scale method is usually found 3. Avdoninite is most commonly found showing vitreous or glassy luster when viewed in reflected light of petrographic polarizing microscope for mineralogists. Avdoninite is also most commonly found leaving a pale green streak when specimen is rubbed on a white porcelain streak plate. Mineral Avdoninite is usually found showing biaxial figure when viewed between crossed nicols of polarizing microscope used in the field of optical mineralogy. It is also usually found showing 0.0380 birefringence. Mineral Avdoninite has a barely detectable radioactivity when chemically evaluated.  



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Thursday, September 30th, 2010 at 3:31 pm
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Optical Mineralogy
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