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For more technical information on this tremolite asbestos
They can also be derived from fine grained igneous rocks
Lake Otero
The dark grains in this sand are derived from the Franciscan Complex
Transparent in thin sheets
fluorite - student specimens of a mineral often associated with metallic ores - massive fluorite - Unit of 5 specimens For more technical information onfluorite calcium fluoride: CaF2 Fluorite is frequently a gangue mineral with metallic ores. Gangue describes uneconomic minerals that are associated with ores. Used as a flux in the manufacture of steel, fluorite derives its name from the Latin fluere, to flow, since it melts at a low temperature compared with other minerals with which it is confused. Circa 1852, Sir George Stokes, mathematics professor at the University of Cambridge, coined the term
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