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The chemical formula of mineral Jennite is indicated by Ca9Si6O18(OH)6•8H2O. Jennite is considered as a late stage mineral in metamorphosed limestone. This mineral is most commonly found at its type of locality at Crestmore Quarry, 5 miles NW of Riverside, Riverside Co. California. Mineral Jennite was named for Clarence Marvin Jenni (1896-1973), American mineral collector and director of the Geological Museum, University of Missouri. Jennite is known to crystallize in the triclinic system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another. Mineral Jennite is usually found exhibiting distinct cleavage in one direction which can be found more closely with the aid of petrographic polarizing microscopes. Mineral Jennite is commonly found white in hand sample. The density measure of mineral Jennite is commonly found ranging from 2.32 to 2.33 grams per cubic centimeters, with an average of 2.32. The crystal habit of mineral Jennite as described in the field of optical mineralogy commonly includes bladed form. This usually shows aggregates of thin lath-like crystals similar to kyanite. It can be also found platy structure with sheet forms similar to that of the micas. The hardness measure of Jennite is usually found 3.5 when evaluated using the Mohs scale method. Jennite is sometimes found fluorescent under short wave ultra violet light and exhibiting weak white appearance. Mineral Jennite is showing vitreous or glassy luster when viewed in reflected light of petrographic polarizing microscopes for geologists. Jennite is also commonly found leaving a white streak when rubbed on white porcelain streak plate. Mineral Jennite is commonly showing biaxial negative figure with birefringence ranging from 0.0190 to 0.0220 when evaluated between crossed nicols of polarizing microscopes for mineralogists. Jennite is found to be not radioactive.



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Friday, September 30th, 2011 at 2:41 am
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Optical Mineralogy
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