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The chemical formula of mineral Junitoite is indicated by CaZn2Si2O7•(H2O). This mineral is commonly found occurring in a retrogressively altered tactite zone, and is closely related to the breakdown of sphalerite in the ores. Junitoite is commonly found from its type of locality at Christmas copper mine, Gila County, Arizona, USA. Mineral Junitoite was named for Jun Ito (1926-1978), Japanese-American mineral chemist, Harvard University, Cambridge, Massachusetts, USA. Junitoite is known to crystallize in the orthorhombic system of crystal formation. In optical mineralogy, this orthorhombic crystal system comprises crystals having three mutually perpendicular axes, of which all are of different lengths. Good cleavage in one direction. Mineral Junitoite is usually found colorless or white in hand sample. The density of this mineral is usually found 3.5 grams per cubic centimeters. Most crystals of mineral Junitoite are found transparent in appearance. Junitoite crystals are also found brittle and this is generally displayed by glasses and most non-metallic minerals. The hardness measure of mineral Junitoite is usually found 4.5 when evaluated using the Mohs scale method. Mineral Junitoite is also exhibiting vitreous or glassy luster in reflected light of polarizing microscope for mineralogists. Junitoite is usually found leaving a white streak when rubbed on white porcelain streak plate. Mineral Junitoite is known to have biaxial figure with 0.0160 birefringence when specimen is evaluated between crossed nicols of polarizing microscope. Mineral Junitoite is found to be not radioactive after chemically evaluated.



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Thursday, December 29th, 2011 at 8:57 am
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Optical Mineralogy
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