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The chemical composition of mineral Clinotyrolite is indicated by the formula Ca2Cu9[(As,S)O4]4(OH)10•10(H2O). Mineral Clinotyrolite  is usually found forming in the oxidized zone of a copper deposit. Clinotyrolite is commonly found at its type of locality at Dongchuan copper mine, Yunnan Province, China. Clinotyrolite was named for the monoclinic symmetry and relationship to tyrolite. Mineral Clinotyrolite 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. Clinotyrolite is usually found colored emerald green in hand sample. The density measure of mineral Clinotyrolite is usually found 3.22 grams per cubic centimeters. Most crystals of mineral Clinotyrolite are found semitransparent in appearance. The crystal habit of mineral Clinotyrolite as described in the field of optical mineralogy usually includes foliated crystals showing two dimensional platy forms which can be more clearly exhibited when evaluated with the aid of polarizing. Mineral Clinotyrolite is also found radial in form where crystals radiate from a center without producing stellar forms similar to stibnite. Mineral Clinotyrolite is also showing silky to pearly luster when viewed in reflected light of petrographic polarizing microscope. Mineral Clinotyrolite is commonly found leaving a light green streak when rubbed on white porcelain streak plate. Mineral Clinotyrolite is also found showing biaxial negative figure with 0.0280 birefringence found when evaluated between crossed nicols of petrographic polarizing microscopes. Mineral Clinotyrolite is also found to be not radioactive.



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Wednesday, August 31st, 2011 at 4:41 am
Category:
Optical Mineralogy
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