caf2

from The Collaborative International Dictionary of English v.0.48

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]

from The Collaborative International Dictionary of English v.0.48

Fluoride \Flu"or*ide\ (? or ?; 104), n. [Cf. F. fluoride.]
   (Chem.)
   A binary compound of fluorine with another element or
   radical.
   [1913 Webster]

   {Calcium fluoride} (Min.), fluorite, {CaF2}. See {Fluorite}.
      [1913 Webster]