16.63: Sodalite
( \newcommand{\kernel}{\mathrm{null}\,}\)
Sodalite | |
---|---|
Chemical composition | Sodium aluminum silicate |
Crystal system | Cubic |
Habit | Massive |
Cleavage | Distinct, dodecahedral |
Fracture | Conchoidal to uneven |
Hardness | 5.5-6.0 |
Refractive index | 1.478-1.488 |
Birefringence | None |
Specific gravity | 2.27 |
Lustre | Vitreous to greasy |