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The chemical formula of Sanidine is indicated by KAlSi3O8 or Potassium Aluminum Silicate. Sanidine is actually a Silicate mineral. Sanidine is usually used as mineral specimen and it is also used in the porcelain industry. Sanidine is actually a polymorph of other minerals that share the same chemistry but have different crystal structures. Sanidine is actually the high temperature form of the k-spars. Sanidine and anorthoclase usually have flattened crystal habit which can be seen more clearly visible when specimen is evaluated closely with the aid of petrographic polarizing light microscopes used in the field of optical mineralogy.

             Sanidine is most commonly found off-white, yellow or pale shades of other colors that could still appear splendid when specimen is evaluated with the aid of polarizing microscopes used in the field of optical mineralogy. It is most commonly found showing vitreous to dull luster if weathered and this can be seen more clearly exhibited when specimens are evaluated more closely under polarizing microscopes used in the field of optical mineralogy. Sanidine crystals are commonly found transparent to translucent in appearance. Sanidine 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. The crystal habit of the mineral Sanidine as described in the field of optical mineralogy usually includes tabular crystals. Its crystals have a nearly rectangular cross-section with slightly slanted dome and pinacoid terminations. It is also found rounded phenocrysts in volcanic rocks. Crystals are commonly twinned which can be found more clearly visible when specimen is viewed with the aid of polarizing microscopes used in optical mineralogy. Sanidine is also commonly found showing good cleavage in two directions forming nearly right angled prisms which can e more clearly exhibited when specimen sample is evaluated with the aid of petrographic polarizing light microscopes for mineralogists. Sanidine is also most commonly found showing conchoidal or uneven fracture when it is closely viewed under polarized microscopes used in the field of optical mineralogy. The hardness measure of the mineral when it is evaluated using the Mohs scale method is usually found 6. Sanidine is most commonly found leaving a white streak when specimen is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral is approximately 2.56 to 2.53 grams per cubic centimeters, which is average value. Sanidine is most commonly found associated with plagioclase feldspars, micas and other minerals found in phenocrysts in volcanic rocks. The best field indicators of mineral Sanidine usually include color, luster, cleavage, lack of striations, twinning if present and occurrence in volcanic rocks. Sanidine notably occurs at several localities including Germany, Russia, Italy, Colorado, New Mexico and many others.



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Sunday, August 30th, 2009 at 3:45 am
Category:
The Silicates Mineral Class
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