Template:Diaspore
From The Gemology Project
Diaspore | |
---|---|
Chemical composition | AlO(OH) |
Crystal system | Orthorhombic |
Habit | Tabular, sometimes fibrous |
Cleavage | Perfect to imperfect |
Fracture | Conchoidal |
Luster | Bright vitreous to pearly (on cleavage surface). |
Hardness | 6.5 - 7 |
Optic nature | Biaxial + |
Refractive index | 1.682 - 1.752 |
Birefringence | 0.040 - 0.048 |
Specific gravity | 3.2 - 3.5 |
Lustre | Vitreous |
Pleochroism | Moderate |