Template:Scapolite
From The Gemology Project
Scapolite | |
---|---|
Chemical composition | Complex sodium aluminium silicate |
Crystal system | Tetragonal |
Habit | Prismatic and massive |
Cleavage | Distinct to perfect (depending on direction) |
Fracture | Conchoidal |
Hardness | 6 |
Optic nature | Uniaxial - |
Refractive index | 1.545-1.580 (depending on color) |
Birefringence | 0.016-0.02 |
Dispersion | Low, 0.017 |
Specific gravity | 2.634-2.74 (depending on color) |
Lustre | Vitreous |
Pleochroism | Medium to strong (depending on color) |