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The chemical formula of mineral Alunogen is indicated by Al2(SO4)3•17(H2O). Alunogen is usually found as secondary mineral commonly associated with coals and pyritiferous shales in arid regions. It is also found at its type of locality at Alum Mountain district, Grant County, New Mexico, USA. Alunogen derived its named from the Latin word alumen for alum and the Greek word genos for origin. Alunogen is known to crystallize in the triclinic system of crystal system of crystal formation. In optical mineralogy, this triclinic crystal system commonly comprises crystals having three axes, of which all are unequal in length and are positioned oblique to one another.            Mineral Alunogen is usually found showing perfect cleavage in one direction, very good in the other and another distinct cleavage on the other direction. These are all found more clearly exhibited when viewed with the aid of polarized microscope used in the field of optical mineralogy. Alunogen is usually found white, yellowish white, reddish white, or yellowish white in color when viewed with the aid of polarizing microscope for mineralogists. The specific gravity measure of mineral Alunogen is usually found ranging from 1.65 to 1.78 grams per cubic centimeters or 1.71 at the average. Most crystals of mineral Alunogen are found transparent in appperance. Alunogen is usually found showing sub-conchoidal fracture when evaluated under petrographic polarizing microscopes. In the field of optical mineralogy fractures are usually developed in brittle materials characterized by semi-curving surfaces. The crystal habit of mineral Alunogen as described in the field of optical mineralogy usually include acicular crystals occuring as needle-like crystals when viewed under polarized microscope used in the field of optical mineralogy. It can be also found with encrustrations forming crust-like aggregates on matrix which can be found more clearly exhibited when evaluated with the aid of petrographic polarizing microscopes used in the field of optical mineralogy. They can be also found in fibrous form with crystals made up of fibers. The hardness measure of mineral Alunogen is usually found ranging from .5 to 2. Alunogen crystals are non-fluorescent when evaluated. They are also most commonly found showing vitreous to pearly luster when evaluated in reflected light of polarizing microscope used in the field of optical mineralogy. Alunogen is also most commonly found leaving a white streak when rubbed on a white porcelain streak plate. Alunogen is commonly found showing biaxial positive figure when evaluated between crossed nicols of polarizing microscope used in the field of optical mineralogy. It has 0.0070 birefringence as evaluated. It has no dispersion displayed. Alunogen is a non-radioactive mineral as evaluated.



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Sunday, May 30th, 2010 at 7:01 am
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Optical Mineralogy
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