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The chemical formula of mineral Tin is usually indicated by the chemical symbol Sn. It is actually classified under Native Elements and it has many applications for metallic tin. The symbol Sn of Native Tin is from the Latin word stannum, for tin. Native Tin mineral is so rare that it is in no way in which it can be thought of as an ore of tin. Pure Tin metal has few uses and thus most tin is used in alloys. The most common tin alloy is actually bronze. Another alloy of tin is pewter. It had been known that tin alloy has been used to make tin cans and tin roofs, but they are no longer used these days for that purpose. At present time, tin has significant use as a corrosion fighter in the protection of other metals and alloys. It is also used in the glass making industry as well as many other varied uses. Tin is actually too rare to be seen in typical rock shops, but laboratory specimens are being grown and put up for sale.

 

            Native Tin is most commonly found white to gray color that could appear more fascinating when viewed with the aid of petrographic polarizing microscope used in the field of optical mineralogy. Native Tin is also usually found showing metallic luster when viewed in reflected light of polarized microscopes fro mineralogists. Most specimens of Native Tin are found opaque in appearance. Native Tin is also known to crystallize in the tetragonal system of crystal formation. In optical mineralogy, this tetragonal system comprises crystals having three axes, which are all in a position perpendicular to one another. Two axes are usually found having the same or equal length.

 

            The crystal habits of Native Tin as described in the field of optical mineralogy usually include grains in placer deposits and lab grown specimens. Native Tin has indistinct cleavage which can be found more clearly visible when specimen is viewed with the aid of polarizing microscope used in the field of optical mineralogy. The hardness measure of Native Tin when it is evaluated using the Mohs scale method is usually ranging from 1.5 to 2. Native Tin is also most commonly found leaving a white-gray streak when specimen sample is rubbed on a white porcelain streak plate. The specific gravity measure of the mineral Native Tin is usually found to be 7.3 grams per cubic centimeters, which is heavy even for a metallic mineral. Native Tin crystals are known to be sectile. It is also usually found associated with other interesting minerals including native gold, native copper native aluminum and other rare native minerals. The best field indicators of Native Tin usually include color, locality, hardness, brittleness and density. Native Tin is usually found in the placer deposits and in unusual igneous intrusions. Native Tin notably occurs at several localities including Australia and some areas in Russia including Southern Urals, Yakutia, Peninsula and Siberia.



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Thursday, August 13th, 2009 at 2:25 pm
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The Native Elements Mineral Class
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