GEMMOLOGICAL PROPERTIES

Apatite

Family:

Apatite

Crystal System:

Hexagonal

Specific Gravity:

3.2

Hardness:

5

Refractive Index:

1.63-1.64

Chemical Composition:

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

Birefringence:

0.002 - 0.004

Pleochroism:

Dichroic

Lustre:

Vitreous

Fracture:

Conchoidal

Cleavage:

Imperfect