Template:Bixbite
From The Gemology Project
Bixbite | |
---|---|
Chemical composition | Beryllium aluminium silicate Be3Al2(SiO3)6 |
Crystal system | Hexagonal |
Habit | Prismatic |
Cleavage | Basal, poor |
Fracture | Conchoidal to uneven |
Hardness | 7.5 - 8 |
Optic nature | Uniaxial - |
Refractive index | 1.561 - 1.577 |
Birefringence | 0.004 - 0.009 |
Dispersion | Low, 0.014 |
Specific gravity | 2.63 - 2.72 |
Lustre | Vitreous |
Pleochroism | Weak |