a common mineral, calcium fluoride, CaF2, occurring in green, blue, purple, yellow, or colorless crystals, usually in cubes: the principal source of fluorene, used also as a flux in metallurgy and for ornament.
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Some fissure veins of fluorite in limestone in southern Illinois are twenty to forty feet wide.
Fluorite is widely distributed, most commonly in vein deposits, often associated with metallic ores.
In England, fluorite is obtained in this manner as a by-product from lead and zinc mines.
Only certain varieties of fluorite show the phenomenon well.
Agricola derived the name fluores from fluo "to flow," and we in turn obtain "fluorite," or "fluorspar," from Agricola.