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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Afghanite is indicated by (Na, Ca, K)8(Si, Al)12O24(SO4, Cl, CO3)3-(H2O). Afghanite is actually generally associated with the sodalite-group minerals. It is found in its type of locality at Sar-e-Sang luzurite deposit in Afghanistan. It was named after its type of locality. Afghanite is known to crystallize in the hexagonal system of crystal formation. In optical mineralogy, the hexagonal system of crystallization comprises crystals having four axes. Three of which are positioned in a single plane with equal length and are symmetrically spaced. The fourth axis is found to be perpendicular to the other three axes. Afghanite is most commonly found blue or colorless in color that appears more fascinating when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy.

 

            Mineral Afghanite is usually found having perfect cleavage in one direction when viewed with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy. Afghanite is most commonly found blue or colorless that could appear more fascinating when viewed with the aid of polarizing microscopes used in the field of optical mineralogy. The specific gravity measure of the mineral is usually found ranging from 2.55 to 2.65 grams per cubic centimeters. Most crystals are usually found transparent in appearance. Afghanite is most commonly found showing conchoidal fracture when evaluated under polarized microscopes used in optical mineralogy. The fractures developed in brittle materials characterized by smoothly curving surfaces.

The crystal habit of the mineral is usually massive. They are usually uniformly indistinguishable crystals forming large masses. The hardness measure of the mineral when it is evaluated using the Mohs scale method is ranging from 5.5 to 6. Afghanite is most commonly found showing vitreous luster when viewed in reflected light of polarizing light microscopes used in the field of optical mineralogy. Afghanite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Afghanite is usually found exhibiting uniaxial positive figure when evaluated between crossed nicols of petrographic polarizing light microscopes used in the field of optical mineralogy. The birefringence of the mineral is usually found 0.0060. Afghanite has a barely detectable radioactivity.



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Saturday, February 27th, 2010 at 9:35 am
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Optical Mineralogy
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