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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

The chemical composition of mineral Julgoldite-(Fe+++) is indicated by the formula Ca8Fe3+2.7Al1.1Mg0.2Fe3+8Si12O42(OH)14. This mineral is usually found occurring at fracture filling in hematite-magnetite ore from the Amerika stope at Langban. Julgoldite-(Fe+++) commonly occurs at its type of locality at Langban, Varmland, Sweden. 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. Julgoldite-(Fe+++) is known to have good cleavage in one direction which can be found more clearly visible when viewed with the aid of polarizing microscope for mineralogists. Mineral Julgoldite-(Fe+++) is also found in deep lustrous black and greenish olive color in hand sample. The density measure of mineral Julgoldite-(Fe+++) is usually found 3.6 grams per cubic centimeters. The crystal habit of mineral Julgoldite-(Fe+++) as described in the field of optical mineralogy usually includes bladed form with aggregates of thin lath-like crystals similar to kyanite. Mineral Julgoldite-(Fe+++) is also found with prismatic crystals shaped like slender prisms similar to tourmaline. The hardness measure of mineral Julgoldite-(Fe+++) is usually found 4.5 when measured using the Mohs scale method. Julgoldite-(Fe+++) is also found showing submetallic luster in reflected light of polarizing microscope for mineralogists. It also shows biaxial negative figure with 0.0600 birefringence when specimen is evaluated between crossed nicols of polarizing microscopes. Mineral Julgoldite-(Fe+++) is found to be not radioactive after chemically evaluated.



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Thursday, December 29th, 2011 at 8:55 am
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Optical Mineralogy
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