La description
Calcium fluoride is a mineral composed of calcium fluoride (CaF2),
the principal fluorine-bearing mineral. It occurs as cubic,
isometric crystals and cleavable masses. When pure, it is colorless
and transparent, or translucent with a glassy luster. Impurities
cause color in the stone, and several varieties exhibit
fluorescence. Usually found either in pure veins or associated with
lead, silver, or zinc ores, it is common in limestone and
dolomites.
Fluorite comes in a wide range of colors and has subsequently been
dubbed "the most colorful mineral in the world". The most common
colors are purple, blue, green, yellow, or colorless. Less common
are pink, red, white, brown, black, and nearly every shade in
between. Color zoning or banding is commonly present. The color of
the fluorite is determined by factors including impurities,
exposure to radiation, and the size of the color centers
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