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The chemical formula of mineral Chekhovichite is indicated by (Bi,Pb,Fe)2Te4O11. Chekhovichite is considered as a rare oxidation product of earlier tellurium-bearing minerals. Zod deposit, 14 km east of Vardenis, Armenia. Mineral Chekhovichite was named for Sergei Konstatinovich Chekhovich (1917-1997), mineralogist and geologist, Polytechnical Institute of Alma-Ata, Kazakhstan. Chekhovichite 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 Chekhovichite is most commonly found showing perfect cleavage found in two directions which is more clearly exhibited when specimen is evaluated closely between crossed nicols of polarizing micrroscopes used in the field of optical mineralogy. Chekhovichite is usually found colored gray green or gray white in hand sample. The density measure of mineral Chekhovichite is usually found 6.88 grams per cubic centimeters. Most crystals of mineral Chekhovichite are found subtransparent in appearance. The crystal habit of mineral Chekhovichite as described in the field of optical mineralogy usually includes microscopic crystals.  These crystals are only made visible with the aid of polarizing microscopes for mineralogists. Sometimes Chekhovichite can be also found forming subhedral crystals which occur as crystals that tend to exhibit a recognizable crystal shape. Twinning is also found common where crystals are usually twinned. The hardness measure of mineral Chekhovichite is usually found 4 when evauated using the Mohs scale method. Chekhovichite is also found exhibiting adamantine luster when viewed in reflected light of petrographic polarizing microscopes. Chekhovichite is also found leaving a white streak when rubbed on white porcelain streak plate. Mineral Chekhovichite is usually found showing biaxial negative figure with birefringence of 0.2000 when evaluated between crossed nicols of polarizing microscopes for mineralogists. Mineral Chekhovichite is also found showing distinct dispersion. Chekhovichite has a marked anisotrophism found as well. When closely evaluated with the aid of petrorpahic polarizing microscopes, it has observable bireflectance. The interference color found is of pale gray to gray with white internal reflections. Mineral Chekhovichite is found to be not radioactive.



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Thursday, June 30th, 2011 at 3:18 am
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Optical Mineralogy
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