Apatite

[æpәtait]

(noun.) a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus.

Typist: Preston--From WordNet

(n.) Native phosphate of lime, occurring usually in six-sided prisms, color often pale green, transparent or translucent.

Checker: Louie

n. a phosphate of lime of great variety of colour.

Editor: Segre