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The chemical formula of mineral Johannsenite is indicated by CaMnSi2O6. This mineral is most commonly found occurring in contact metasomatic rocks. Johannsenite is also usually found from its type of locality at the Empire Zinc Company mine near Hanover, Grant County, New Mexico. Mineral Johannsenite was named after Prof. Albert Johannsen of the University of Chicago. Johannsenite 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 Johannsenite is known to have good cleavage in one direction which can be found more clearly visible when closely evaluated with the aid of petrographic polarizing microscope used in the field of optical mineralogy. Johannsenite is also found showing brown, brownish black, greenish, gray, or gray green color in hand sample. The density measure of mineral Johannsenite is usually found 3.56 grams per cubic centimeters. Most crystals of mineral Johannsenite are found translucent to opaque in appearance. Mineral Johannsenite are commonly found showing uneven fracture with flat surfaces (not cleavage) fractured in an uneven pattern, all of which can be found more clearly exhibited when evaluated closely under polarized microscope used in the field of optical mineralogy. The crystal habit of mineral Johannsenite as described in the field of optical mineralogy includes acicular forms occurring as needle-like crystals. It can be also found massive in form showing granular crystals, a common texture observed in granite and other igneous rock. The hardness measure of mineral Johannsenite is usually found 6 when evaluated using the Mohs scale method. Mineral Johannsenite is usually found non-fluorescent. Johannsenite is also found showing vitreous or glassy luster when evaluated in reflected light of polarized microscope for mineralogists. Mineral Johannsenite is also found leaving a greenish gray streak when rubbed on white porcelain streak plate. Mineral Johannsenite is also found to be not radioactive.



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Friday, October 14th, 2011 at 3:42 am
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Optical Mineralogy
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