Template:True blue
From The Gemology Project
True Blue beryl | |
---|---|
Chemical composition | Beryllium Aluminium Silicate Be3Al2(SiO3)6 |
Crystal system | Hexagonal |
Habit | edit me |
Cleavage | edit me |
Fracture | edit me |
Hardness | 7.5 |
Optic nature | edit me |
Refractive index | 1.57 - 1.58 |
Birefringence | edit me |
Dispersion | edit me |
Specific gravity | 2.69 |
Lustre | Vitreous |
Pleochroism | edit me |