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The chemical formula of mineral Aspidolite is indicated by NaMg3AlSi3O10(OH)2. Aspidolite is usually found forming in Zone 4 (forsterite-diopside) of the contact aureole around the Kaizuki-yama granite. Aspidolite is most commonly found at its type of locality in waste rock in the Kawai pit of the Kasuga mine. Kasuga-mura, Gifu Prefecture, central Japan. Mineral Aspidolite was named from the Greek “aspisidos”, like a shield, alluding to the appearance of its crystals. Aspidolite 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 Aspidolite is commonly found showing perfect cleavage in one direction which can be found more clearly visible when evaluated closely with the aid of polarized microscope used in the field of optical mineralogy. Aspidolite is usually found colored light brown, white, greenish, or red in hand sample. Most crystals of mineral Aspidolite are found transparent to translucent in appeaarance. Mineral Aspidolite is most commonly found showing brittle to irregular fracture when viewed closely under polarizing microscope used in the field of optical mineralogy. This is actually a very brittle fracture producing irregular fragments. The crystal habit of mineral Aspidolite as described in the field of optical mineralogy usually includes platy sheet forms. The hardness measure of mineral Aspidolite when it is evaluated using the Mohs scale method is usually found ranging from 2 to 3. Mineral Aspidolite is most commonly found showing vitreous to pearly luster when viewed in reflected light of polarizing microscope for mineralogists. Aspidolite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Mineral Aspidolite is usually found showing biaxial negative figure when evaluated between crossed nicols of petrographic polarizing light microscope used in the field of optical mineralogy. Aspidolite is also showing 0.0280 birefringence. Mineral Aspidolite has barely detectable radioactivity.



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Thursday, September 30th, 2010 at 3:13 pm
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Optical Mineralogy
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