Apatite is the name of a group of phosphate minerals with similar chemical compositions and physical properties.
They are an important constituent of phosphorite, a rock mined for its phosphorus content and used to make fertilizers, acids, and chemicals.
Apatite has a relatively consistent hardness and serves as the index mineral for a hardness of five in the Mohs Hardness Scale.
Sizes:
15 -28*18*8mm,
16 -37*19*6mm- small defect on the back,
17 -35*18*7mm,
18 -28*20*6mm,
19 -,
20 -28*17*7mm,
21 -27*20*6mm,
22 -31*16*5mm