Number 18

Color--------------------Greenish yellow

Luster------------------Nonmetallic, glassy

Streak------------------White

Hardness--------------5.0

Cleavage/--------------Fracture, jagged
Fracture

S.G.---------------------3.1 - 3.2

Special Properties---Has hexagonal crystals.

Formula----------------Ca5(PO4)3(F,Cl,OH)

Mineral name---------Apatite

Family------------------Phosphates

Uses--------------------Manufacture phosphate fertilizers

Apatite