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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical composition of mineral Callaghanite is indicated by the formuls Cu2Mg2(CO3)(OH)6•2(H2O). Mineral Callaghanite is usually found occuring disseminated in the contact zone between diorite and serpentinized dolostone. This mineral is usually found at its type of locality at Gabbs, Gabbs district, Nye Co., Nevada, USA. Mineral Callaghanite was named for Eugene Callaghan (1904-1990), Director of the New Mexico Bureau of Mines, Socorro, New Mexico, USA. Callaghanite 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 Callaghanite is commonly found showing perfect cleeavage in 2 directions which can be seen more clearly visible with the aid of polarizing microscope for mineralogists. Callaghanite is commonly found colored azure or violet blue in hand sample. The density measure of the mineral is usually found 2.71 grams per cubic centimeters. Most crystals of mineral Callaghanite are found transparent in appearance. Callaghanite is usually found showing brittle to uneven fracture when viewed with the aid of petrographic polarizing microscopes. This is a very brittle fracture producing uneven fragments. The hardness measure of the mineral is commonly found ranging from 3 to 3.5 when evaluated using the Mohs scale method. Callaghanite is commonly found showing vitreous or glassy luster when viewed in reflected light of polarizing microscope. It is commonly found leaving white streak when rubbed on white porcelain streak plate. Callaghanite is commonly found showing biaxial negative figure when evaluated between crossed nicols of polarizing microscopes. Callaghanite is commonly showing a birefringence of 0.1210. Callaghanite is found to be a non- radioactive mineral.



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Friday, April 29th, 2011 at 8:46 am
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Optical Mineralogy
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