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Sodalite

Sodalite is a royal blue tectosilicate mineral (Na ₈Cl ₂). It usually forms in it’s massive or ‘rock like’ habit. It is opaque being widely used as an ornamental gemstone. Although massive sodalite samples are opaque, rare crystals are usually transparent to translucent. It has a hardness of 5.5-6on the Mohs scale.