16.4.6: Green Beryl
- Page ID
- 4035
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Green Beryl | |
---|---|
Chemical composition | Be3Al2(SiO3)6Beryllium aluminium silicate |
Crystal system | Hexagonal |
Habit | Prismatic |
Cleavage | Imperfect, basal |
Hardness | 7.5 |
Optic nature | Uniaxial - |
Refractive index | 1.564 - 1.593 |
Birefringence | 0.005-0.006 |
Dispersion | Low, 0.014 |
Specific gravity | 2.68-2.72 |
Lustre | Vitreous |
Pleochroism | Weak to distinct |