'Fluorite' definitions:

Definition of 'fluorite'

From: WordNet
noun
A soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine [syn: fluorite, fluorspar, fluor]

Definition of 'Fluorite'

From: GCIDE
  • Fluorite \Flu"or*ite\, n. (Min.) Calcium fluoride (CaF2), a mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called {fluor spar}, or simply fluor. [1913 Webster]