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Click Here For Best Selection Of High Quality Polarizing Microscope

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The chemical formula of mineral Alforsite is indicated by Ba5(PO4)3Cl. Alforsite is usually found in lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite. Alforsite is most commonly found at its type of locality at some areas in California, USA. The mineral was named to honor Dr. John T. Alfos, a geologist, California Division of Mines, for his work on the locality. Alforsite 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.

            Alforsite is usually found colorless in hand sample. They usually appear transparent if cut in thin section. The specific gravity measure of the mineral is usually found 4.73 grams per cubic centimeters. The hardness measure of the mineral when it is evaluated closely using the Mohs scale method is usually found 5. Alforsite is most commonly found leaving a white streak when rubbed on a white porcelain streak plate. It is also usually found exhibiting vitreous to glassy luster when viewed in reflected light of petrographic polarizing light microscopes used in optical mineralogy. Alforsite is most commonly found showing uniaxial negative figure when evaluated between crossed nicols of polarized microscopes. Alforsite is a non-radioactive mineral as evaluated.



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Tuesday, March 30th, 2010 at 9:31 am
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Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope