Apatite
Refractive Index |
1.628 to 1.651 |
Birefringence |
0.002 to 0.008 |
Dispersion |
0.013 |
Specific Gravity |
3.16 to 3.23 |
Transparency |
Transparent |
Pleochroism |
Weak to Strong |
Fluorescence |
Inert to greenish yellow; blue |
Optical Character |
Uniaxial - |
Cleavage |
Indistinct |
Fracture |
Conchoidal |
Lustre |
Vitreous |
Mohs Hardness |
5 |