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The chemical formula of mineral Afwillite is indicated by Ca3(Si2O4)(OH)6. Afwillite is a known product of contact metamorphism of limestones. Afwillite is from the Dutoitspan diamond mine, Kimberly, and the Wessels mine, near Kuruman, Cape Province, South Africa. Afwillite was named for Alpheus Fuller Williams (1874-1953), General Manager, DeBeers Consolidated Mines, Kimberly, South Africa. Afwillite 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.            Afwillite is usually found exhibiting perfect cleavage in one direction and distinct cleavage in the other, all of which can be seen more clearly visible when viewed with the aid of petrographic polarizing light microscope used in the field of optical mineralogy. Afwillite is usually found colorless, white in color that is more interesting under polarized microscopes. Afwillite is known to have a specific gravity of about 2.62 grams per cubic centimeters. Crystals of mineral Afwillite are commonly found transparent to subtransparent to translucent in appearance. Afwillite crystals are usually found in massive forms that are usually uniformly indistinguishable crystals forming large masses. It is also usually found forming prismatic crystals shaped like slender prisms. The hardness measure of mineral Afwillite when it is evaluated using the Mohs scale method is usually 3. Afwillite is most commonly found exhibiting vitreous luster when viewed in reflected light of polarizing microscopes used in optical mineralogy. Afwillite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Afwillite is usually found showing biaxial positive figure when evaluated between crossed nicols of petrographic polarizing microscope. It has 0.0167 birefringence. Afwillite is not radioactive mineral.



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Sunday, February 14th, 2010 at 11:10 am
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Optical Mineralogy
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