Template:Sodalite

From The Gemology Project
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Sodalite
Chemical composition Sodium Aluminium 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