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Selenium (Se) is a mineral with a hexagonal crystal structure, point group 32, and forms acicular crystals, sheetlike clusters, and felted masses. It has a metallic luster, gray to purple-gray color, and a red streak. Selenium is opaque, but transparent in thin fragments, with a hardness of 2 and a density of 4.80-4.809 g/cm³. It occurs at relatively low temperatures by sublimation of fumarolic vapors and from oxidation of selenium-bearing organic compounds in sandstone U-V deposits. Selenium is associated with minerals like pyrite, ferroselite, and zippeite, and is found in various locations worldwide, including the USA, Mexico, Bolivia, Italy, Czech Republic, Russia, and China. The name "selenium" comes from the Greek word "selene," meaning moon, due to its similarity to tellurium, named after the earth.

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Description

Selenium (Se) is a mineral with a hexagonal crystal structure, point group 32, and forms acicular crystals, sheetlike clusters, and felted masses.

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