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The chemical formula of mineral Juanite is indicated by Ca10Mg4Al2Si11O39•4(H2O). Juanite is an alteration product of melilite. This mineral is most commonly found occurring from an Iron Hill, Powderhorn-Cebolla district, Gunnison County, Colorado. USA. Juanite was named for the San Juan Mountains, Colorado, USA. Juanite 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. Mineral Juanite is commonly found white, pistachio green, or brown in hand sample. The density measure of mineral Juanite is usually found ranging from 3.01 to 3.28 grams per cubic centimeters, with an average of 3.14. Most crystals are found translucent in appearance. The crystal habit of mineral Juanite as described in the field of optical mineralogy is usually found fibrous in form with crystals made up of fibers. The hardness measure of mineral Juanite is usually found 5.5 when evaluated using the Mohs scale method. Juanite is also known to have biaxial positive figure with 0.0070 birefringence when specimen is eavaluated between crossed nicols of polarizing microscope. Mineral Juanite is found to be not radioactive after chemically evaluated.



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Thursday, December 29th, 2011 at 8:51 am
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Optical Mineralogy
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