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The chemical formula of mineral Amarantite is indicated by Fe3+(SO4)(OH)•3(H2O). Amarantite is a secondary mineral formed especially in arid climates. Amarantite can be found at its type of locality at Compania mine, east of Sierra Gorda, Chile.Amarantite was named from the Greek word for amaranth, an imaginary purplish red undyiong flower, for its color. Amarantite 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.            Amarantite is usually found showing perfect cleavage in two directions which can be found more clearly visible when viewed with the aid of petrograpic polarizing microscope used in the field of optical mineralogy. Amarantite is usually found brown red, orange red, pink or red in color that appears more fascinating when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. The specific gravity measure of the mineral is usually found ranging from 2.189 to 2.286 grams per cubic centimeters giving an average value of about 2.23. Most crystals of mineral Amarantite are found transparent in appearance. The hardness measure of the mineral Amarantite is usually found 2.5. It is most commonly found showing vitreous luster when evaluated in reflected light of polarized microscope. It is usually found leaving a yellow streak when rubbed on a white porcelain streak plate. Amarantite is sually found showing biaxial negative figure when evaluated between crossed nicols of petrographic polarizing miroscope used in the field of opical mineralogy. It commonly shows 0.1050 birefringence. Amarantite is a non-radioactive mineral.



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Sunday, May 30th, 2010 at 8:25 am
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Optical Mineralogy
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