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The chemical formula of mineral Bromargyrite is indicated by AgBr. This mineral is most commonly found in oxidized portions of silver deposits. This mineral Bromargyrite is usually found occuring at its type of locality at Mexico, Chile. This mineral was named after its composition of bromine, from the Greek word, bromos which means “stench” and silver which came from the Latin word, argentum. Bromargyrite is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Bromargyrite has no cleavage display even if evaluated closely with the aid of petrographic polarizing microscopes. Mineral Bromargyrite is most commonly found greenish brown, gray green, grayish yellow, yellow, or olive green color in hand sample. Mineral Bromargyrite is usually found with specific gravity measure ranging from 5.8 to 6 grams per cubic centimeters, with an average of 5.9. Most crystals of mineral Bromargyrite are found transparent to translucent in appearance. Mineral Bromargyrite is commonly found showing conchoidal to uneven fracture producing small, conchoidal fragments. The hardness measure of mineral Bromargyrite is usually ranging from 1.5 to 2 when evaluated using the Mohs scale method. Mineral Bromargyrite is also commonly found showing adamantine to greasy luster when evaluated in reflected light of petrographic polarizing light microscopes. Mineral Bromargyrite is commonly found leaving a gray streak when rubbed on white porcelain streak. This mineral is found to be isotropic when viewed with the aid of polarizing microscope. Bromargyrite is found to be not radioactive after chemically evaluated.



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Tuesday, March 29th, 2011 at 5:52 am
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Optical Mineralogy
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