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Transparent in thin sheets
They can also be derived from fine grained igneous rocks
Much of this reaction to ultraviolet is directional - illuminate a rhomb from one direction and the reaction is strong
drives around on the dunes and sifts the sand where these appear
as classified by Matthew A
fluorite - student specimens of a mineral often associated with metallic ores - massive fluorite - Unit of 5 specimens Transparent in thin sheetsfluorite 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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