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Sodalite

Gemstone
Sodalite is a tectosilicate mineral with the formula Na ₈Cl ₂, with royal blue varieties widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of... Wikipedia
Colors: Blue and Purple
Formula: Na 8(Al 6Si 6O 24)Cl 2
Chemical formula: Na₈Al₆Si₆O₂₄ Cl₂
Hardness (Mohs hardness scale): 5.5 – 6
Luster: Greasy and Waxy
Category: Tectosilicates without zeolitic H2O
Cleavage: Poor on