Fluorite crystals. Fluorite or fluorspar (calcium fluoride, CaF2) is a fairly common mineral, extensively mined for use in steelmaking (as a flux) and

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Fluorite crystals. Fluorite or fluorspar (calcium fluoride, CaF2) is a fairly common mineral, extensively mined for use in steelmaking (as a flux) and in other industrial processes. It occurs in cubic crystal groups that can vary in colour from soft green and yellow to colourless and deep purple.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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