mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5 to 6; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27 to 2.33

Hardness: 5
Color: Royal blue, grey, or white
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27 to 2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic rocks such as marbles.

Uses & applications

Used primarily as a gemstone, decorative carvings, and in jewelry. Historically used for architectural ornaments.

Geological facts

Named for its high sodium content. It is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks. Large deposits are found in the 'Princess Sodalite Mine' in Ontario, Canada.

Field identification & locations

Identified by its rich blue color and white veins of calcite. Unlike similar minerals, it will turn pink or yellow under short-wave UV light. Common in Canada, Brazil, and Namibia.