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The chemical composition of mineral Chestermanite is indicated by the formula Mg2Fe3+0.6Mg0.2Al0.1Sb0.1BO5. Mineral Chestermanite is commonly found at its type of locality at Twin Lakes region, Fresno County, California, USA. This mineral was named for Charles W. Chesterman (1913-1991), U. S. Geologist who discovered the mineral. Mineral Chestermanite 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. Chestermanite has no cleavage found even when evaluated closely with the aid of polarized microscopes for mineralogists. Mineral Chestermanite is usually found colored gray green, black or black green in hand sample. The density measure of mineral Chestermanite is usually found 3.72 grams per cubic centimeters. Most crystals of mineral Chestermanite are found transparent in appearance. The crystal habit of mineral Chestermanite as described in the field of optical mineralogy usually includes prismatic crystals shaped like slender prisms like tourmaline. The hardness measure of mineral Chestermanite is usually found 6 when evaluated using the Mohs scale method. Chestermanite is commonly found exhibiting vitreous to silky luster in reflected light of polarized microscopes. Mineral Chestermanite is commonly found leaving a light gray green streak when rubbed on white porcelain streak plate. Mineral Chestermanite is commonly found showing biaxial positive figure with 0.0380 birefringence when viewed closely between crossed nicols of petrographic polarizing microscopes. Mineral Chestermanite is found to be pleochroic showing dark blue green, green and pale yellow brown color. Mineral Chestermanite is found to be not radioactive.



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Thursday, June 30th, 2011 at 3:22 am
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Optical Mineralogy
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