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The chemical formula of element Selenium is indicated by Se or Elemental Selenium. Selenium is classified under the Native Elements Class. Native Selenium is only used as mineral specimens. Selenium is considered as a very rare mineral. It is too scarce wherever it is found and it is not found too often. Selenium is most commonly found distinctive red gray color that would appear more fascinating when viewed with the aid of petrographic polarizing light microscope. Selenium is most commonly found showing metallic luster when viewed in reflected light of polarized microscope used in optical mineralogy. Selenium has many industrial uses. It is usually used for photovoltaic and photoconductive purposes. It is also used as a good tracer element for medical purposes and as isotope tracer in ground water for hydrogeologic purposes.

 

            Native Selenium does not usually form good crystals. However, when it does, the crystals are usually steep rhombohedrons or tiny tiny acicular or hair-like in form and it is usually found more fascinating in appearance when viewed with the aid of polarizing microscopes. Massive specimens of Selenium are also known in the mineral world. Selenium is an interesting elemental mineral that rarely forms good specimens, which appear more splendidly wonderful when viewed with the aid of petrographic polarizing light microscopes for mineralogists. Selenium is most commonly found reddish-gray to red color that could appear more fascinating when viewed with the aid of polarizing microscopes for mineralogists. Native Selenium is known to exhibit metallic luster when viewed in reflected light of polarized microscopes used in the field of optical mineralogy.

 

            Most crystals of Elemental Selenium are found opaque in appearance. Selenium is known to crystallize in the trigonal system of crystal formation. The crystal habit of Selenium as described in the field of optical mineralogy usually include steep rhombohedrons or tiny acicular or hair like crystals. Selenium can be also found massive in form. Native Selenium is most commonly found leaving a gray streak when rubbed on a white porcelain streak plate. The hardness measure of mineral Selenium when it is evaluated using the Mohs scale method is usually found 2. The specific gravity measure of the mineral is usually found 4.8 grams per cubic centimeters, which is average for metallic minerals. The best field indicators of mineral Selenium usually include hardness, color, locality and density. Selenium notably occurs at several localities including Italy, Mexico, Germany, Bolivia, Argentina and several areas in USA.



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Thursday, July 30th, 2009 at 8:36 am
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The Native Elements Mineral Class
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