Sodalite

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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