Sodalite

Category: Tectosilicates without zeolitic H₂O
Formula (repeating unit): Na · ₈(Al · ₆Si · ₆O · ₂₄)Cl · ₂
Strunz classification: 9.FB.10
Crystal system: Cubic
Crystal class: Hextetrahedral (43m) · H-M symbol: (4 3m)
Space group: P43n
Category:

Description

Sodalite (/ˈsoʊ.dəˌlaɪt/ SOH-də-lyte) is a royal blue tectosilicate mineral with the formula Na₈(Al₆Si₆O₂₄)Cl₂, widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group with hauyne, nosean, lazurite and tugtupite.

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