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The chemical formula of mineral Alumohydrocalcite is indicated by CaAl2(CO3)2(OH)4•3(H2O). Mineral Alumohydrocalcite is considered as a secondary mineral associated with allophane. It is also usually found at the Khakassky district in Russia. Alumohydrocalcite was named after its chemical composition. Alumohydrocalcite is known to crystallize in the triclinic system of crytal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another.             Alumohydrocalcite is usually found showing perfect cleavage in one direction and imperfect in the other direction. These can be found more clearly visible when evaluated with the aid of petrographic polarizing microscope for mineralogists. Alumohydrocalcite is most commonly found chalky white, bluish white, light yellow, violet or gray when viewed with the aid of polarized microscope used in the field of optical mineralogy. The specific gravity measure of the mineral is usually found 2.23 grams per cubic centimeters. Most crytals of mineral Alumohydrocalcite are found transparent to translucent in appearance. Alumohydrocalcite is also most commonly found showing unven fracture when viewed under polarizing microscope. In the field of optical mineralogy, this are actually flat surfaces not he cleavage, fractured in an uneven pattern. The crytal habit of the mineral as described in optical mineralogy usually includes acicular forms occuring as needle-like crystals which can be found more clearly visible when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Alumohydrocalcite can be also found massive to fibrous in form. The crystals are found as distinctly fibrous fine-grained forms. Sometimes it can be found as spherical, rounded aggregates that are more fascinating when viewed with the aid of petrographic polariing microscope used in the field of optical mineralogy. The haarness measure of the mineral when it is evaluated using the Mohs scale method is usually found 2.5. Alumohydrocalcite is most often found exhibiting vitreous luster when viewed in reflected light of polarizing microscope for mineralogists. Alumohydrocalcite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Alumohydrocalcite is most commonly found showing a biaxial negative figure when evaluated between crossed nicols of petrograhic polarizing light microscope used in the field of optical mineralogy. It is also commonly found showing birefringence ranging from 0.0830 to 0.0850. Alumohydrocalcite is a non-radioactive mineral as evaluated.



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Sunday, May 30th, 2010 at 6:42 am
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Optical Mineralogy
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