mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: 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
Color: Royal blue, often with white calcite veining
Luster: Vitreous to greasy

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: 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 and phonolites. It can also occur in contact metasomatic zones. Known primarily from deposits in Canada (Ontario), Namibia, and Brazil.

Uses & applications

Used extensively as a semi-precious gemstone for jewelry, ornamental carvings, and architectural finishing (tabletops, tiles). In industry, it is sometimes used as a pigment (though less common than lapis lazuli).

Geological facts

Sodalite is a member of the feldspathoid group. It was first discovered by Europeans in 1811 in Greenland but became popular as 'Princess Blue' after Princess Margaret of England visited the Princess Sodalite Mine in Ontario, Canada.

Field identification & locations

Identify in the field by its distinct deep blue color and white streaks; unlike Lapis Lazuli, it rarely contains golden pyrite flecks. Frequently found in Bancroft (Ontario), Brazil, and the Kola Peninsula (Russia). Collectors look for vibrant blue saturation.

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