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Geosciences LibreTexts

16.63: Sodalite

  • Page ID
    6491
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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