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The chemical formula of mineral Changoite is indicated by Na2Zn(SO4)2•4(H2O). This mineral is usually found as a product of oxidation in an old mining area. Changoite is also considered as the zinc-dominant analogue of blodite and nickelblodite. Mineral Changoite is commonly found from its type of locality at 2 km west of Sierra Gorda, northeast of Antofagasta, northern Chile. Changoite was named after the changos, the early former inhabitants of northern Chile. Mineral Changoite 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. Changoite is usually found colorless in hand sample. The density measure of mineral Changoite is usually found 2.5 grams per cubic centimeters. Most crystals of mineral Changoite are found transparent in appearance. The crystal habit of mineral Changoite as described in the field of optical mineralogy usually includes anhedral grains. These are granular minerals without the expression of crystal shapes. Changoite is known to be water soluble or considered as a water soluble mineral. Mineral Changoite is usually found showing vitreous luster in reflected light of petrographic polarizing microscopes. Changoite is also commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Changoite is commonly found showing biaxial negatiive figure with 0.0100 birefringence when evalauted between crossed nicols of polarizing microscopes. Mineral Changoite is also found to be not radioactive.



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Thursday, June 30th, 2011 at 3:16 am
Category:
Optical Mineralogy
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