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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical composition of mineral Coalingite is indicated by the formula Mg10Fe3+2(CO3)(OH)24•2(H2O). This mineral is commonly found at its type of locality at New Idria district, Fresno and San Benito Counties, California. Coalingite was named after the town of Coalinga, California. The town was named after the railroad’s Coaling Station “A.” Mineral Coalingite is also known to crystallize in the trigonal-hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Mineral Coalingite is commonly found showing good cleavage when evaluated using the polarizing microscope used in the field of optical mineralogy. Mineral Coalingite is usually found colored bronze brown, light brown or reddish brown in hand sample. Mineral Coalingite is commonly found with density measure ranging from 2.33 to 2.42 grams per cubic centimeters, with an average of 2.37. The hardness of mineral Coalingite is usually found ranging from 1 to 2 when evaluated using the Mohs scale method. Mineral Coalingite is also found exhibiting resinous luster in reflected light of polarizing microscope. Mineral Coalingite is also found showing uniaxial negative figure with 0.0280 to 0.0450 birefringence found when evaluated between crossed nicols of petrographic polarizing microscope. Mineral Coalingite is also found not radioactive after chemical evaluation.



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Wednesday, August 31st, 2011 at 4:42 am
Category:
Optical Mineralogy
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