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The chemical composition of mineral Julgoldite-(Fe++) is inidicated by the formula Ca2Fe2+Fe3+1.5Al0.5(SiO4)(Si2O7)(OH)2ยท(H2O). Mineral Julgoldite-(Fe++) was named in 1971 by Moore for Julian Royce Goldsmith (1918-), American geochemist, University of Chicago. Julgoldite-(Fe++) is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis. Mineral Julgoldite-(Fe++) is usually found black, greenish black, or green in hand sample. Mineral Julgoldite-(Fe++) is also found with density measure of 3.602 grams per cubic centimeters. Most crystals of mineral Julgoldite-(Fe++) is also found translucent in appearance. The hardness measure of mineral Julgoldite-(Fe++) is usually found 4.5 when evaluated using the Mohs scale method. Mineral Julgoldite-(Fe++) is also found with sub-metallic luster in reflected light of polarizing microscope for mineralogists. It is also showing biaxial negative figure with 0.0600 birefringence when specimen is evaluated between crossed nicols of polarizing microscope for optical mineralogy. Mineral Julgoldite-(Fe++) is also found not radioactive when chemically evaluated.



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Thursday, December 29th, 2011 at 8:54 am
Category:
Optical Mineralogy
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