(n) :
(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment, and also produced biologically in bones and teeth.
(n) :
(mineralogy) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer, as a gemstone, and (in powdered form) as a pigment, and also produced biologically in bones and teeth.