APATITE
apatite
(noun) a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus
Source: WordNet® 3.1
Etymology
Noun
apatite (countable and uncountable, plural apatites)
(mineral) A calcium fluoride phosphate of variable composition, sometimes used in the manufacture of fertilizer.
Source: Wiktionary
Ap"a*tite, n. Etym: [Gr. (Min.)
Definition: Native phosphate of lime, occurring usually in six-sided
prisms, color often pale green, transparent or translucent.
Source: Webster’s Unabridged Dictionary 1913 Edition