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The chemical formula of mineral Jasmundite is indicated by Ca11(SiO4)4O2S. Jasmundite is commonly occurring in metamorphosed limestone inclusions in basalt. Jasmundite is commonly found at its type of locality at Bellerberg volcano, two km north of Mayen, Eifel district, Germany. Mineral Jasmundite was named for Karl Jasmund, retired Director of the Mineralogical-Petrographic Institute, University of Cologne, Cologne, Germany. Jasmundite is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length. Jasmundite has no cleavage found even when evaluated closely with the aid of polarizing microscopes. Jasmundite is commonly found colored brownish green, greenish brown, or dark brown in hand sample. The density measure of this mineral is usually found 3.03 grams per cubic centimeters. Mineral Jasmundite is commonly found showing conchoidal fracture developed in brittle materials characterized by smoothly curving surfaces, similar to quartz. The hardness measure of Jasmundite is usually found 5 when evaluated using the Mohs scale method. It is usually found exhibiting resinous luster when viewed in reflected light of polarizing microscopes. Jasmundite is commonly found leaving a white streak when rubbed on white porcelain streak plate. This mineral is commonly showing uniaxial positive figure with 0.0130 birefringence when evaluated between crossed nicols of polarized microscopes. Jasmundite is found to be not radioactive.



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Friday, September 30th, 2011 at 12:31 am
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Optical Mineralogy
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