mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue (often with white calcite veining), Luster: Vitreous to greasy, Crystal Structure: Isometric (cubic), Cleavage: Poor, Specific Gravity: 2.27-2.33

Hardness: 5

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue (often with white calcite veining), Luster: Vitreous to greasy, Crystal Structure: Isometric (cubic), Cleavage: Poor, Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites or phonolites, and occasionally in contact metamorphic rocks. It crystallizes from sodium-rich hydrothermal fluids.

Uses & applications

Primarily used as an ornamental gemstone for cabochons, beads, and carvings. Also used at an industrial scale for architectural surfaces (countertops, tiles) and as a collector's mineral specimen.

Geological facts

Sodalite is a member of the sodalite mineral group, which also includes lazurite. It was discovered in Greenland in 1811 but became commercially significant after a discovery in Ontario, Canada, in 1891 during a royal visit; it is sometimes called 'Princess Blue' as a result.

Field identification & locations

Identify in the field by its distinct royal blue color and characteristic white calcite veins. Unlike Lapis Lazuli, Sodalite rarely contains golden pyrite inclusions. It is commonly found in Brazil, Namibia, Canada (Ontario), and Russia.

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