mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

AI-generated identification · may be incorrect

Hardness: 5.5 to 6 on Mohs scale. Color: Royal blue to denim blue with white calcite veins/mottling. Luster: Vitreous to greasy. Crystal system: Isometric. Specific gravity: 2.14 to 2.40. Poor to fair cleavage.

Hardness: 5
Color: Royal blue to denim blue with white calcite veins/mottling
Luster: Vitreous to greasy

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites, phonolites, and associated pegmatites. It crystallizes directly from alkaline magma or forms through metasomatic processes.

Uses & applications

Popular as a gemstone for jewelry (beads, cabochons), carvings, decorative tumbled stones, and ornamental architectural uses. Historically used as an ornamental stone.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite typically lacks the golden pyrite inclusions found in Lapis and features prominent white calcite streaks instead.

Field identification & locations

Identified by its rich blue color with white calcite veining and lack of brassy pyrite. Major localities include Bancroft (Ontario, Canada), Brazil, Namibia, Greenland, and Russia.