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The chemical formula of mineral Brownmillerite is indicated by Ca2(Al,Fe+++)2O5. Brownmillerite is usually found in a thermally metamorphosed limestone blocks included in volcanic rocks. Brownmillerite is commonly found at its type of locality at Ettringer-Bellerberg volcano, near Mayen, Eifel district, Germay. Mineral Brownmillerite was named for Lorrin Thomas Brownmiller (1902-), Chef chemist of the Alpha Portland Cement Company, Easton, Pennsylvania, USA. Brownmillerite 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. Brownmillerite is usually found colored reddish brown in hand sample. The specific gravty measure of mineral Brownmillerite is usually found 3.76 grams per cubic centimeters. Most crystals of mineral Brownmillerite are found semitransparent in appearance. The crystal habit of mineral Brownmillerite as described in the field of optical mineralogy usually includes platy or sheet forms like that of micas. It can be also found in square forms occurinngs as square crystals in shape or outline. This mineral is most commonly found leaving a light brown streak in hand sample. Brownmillerite is found to be not radioactive after chemical evaluation.



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Tuesday, March 29th, 2011 at 5:53 am
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Optical Mineralogy
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