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The chemical formula of mineral Blossite is indicated by Cu2V+++++2O7. Blossite is also considered as a very rare sublimate, probably formed between 100-200 deg C, from the outer sulfate zone of a fumarole in the crater of a basaltic composite volcano. This mineral is commonly found at its type of locality at Summit crater of Izalco Volcano, San Salvador. Blossite was named for F. Donald Bloss, American mineralogist, Virginia Polytechnic Institute, Blacksburg, Virginia. Blossite 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.

 

            Blossite is commonly found colored black in hand sample. However, it can be intersting when evaluated with the aid of petrographic polarizing microscope used in the field of optical mineralogy. The specific gravity measure of the mineral as evaluated is usually found ranging from 3.95 to 3.97 grams per cubic centimeters, giving an average of 3.96. Most crystals of Blossite are found opaque in appearance. The crystal habit of mineral Blossite as described in the field of optical mineralogy usually includes anhedral grains forming granular minerals without the expression of crystal shapes. Blossite is also commonly found exhibiting metallic luster when evaluated in reflected light of polarizing microscope used in the field of optical mineralogy. When rubbed on white porcelain streak plate, Blossite is most commonly found leaving a red brown streak. Blossite is found to be moderately anisotrophic showing gray to creamy gray-brown color. It also has weak to moderate bireflectance which can be noticed in shades of cream-white. Interference color exhibited by Blossite is usually white with red-brown internal reflection which can be seen more clearly visible when evaluated closely under polarizing microscope used in the field of optical mineralogy. Blossite is a non-radioactive mineral as evaluated.



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Saturday, January 15th, 2011 at 3:40 am
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Optical Mineralogy
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