mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

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

Identified March 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites or phonolites) and some contact metamorphic rocks. Frequently found as masses rather than distinct crystals.

Uses & applications

Popular in jewelry as cabochons and beads, used for decorative carvings, ornamental stone in countertops, and as an industrial pigment. Collected widely by mineral enthusiasts.

Geological facts

First discovered in Greenland in 1811, but became famous after a visit by Princess Margaret of England to Ontario, Canada, in 1901; it is sometimes referred to as 'Princess Blue'. It is known for its strong orange-yellow fluorescence under long-wave ultraviolet light.

Field identification & locations

Identify in the field by its characteristic deep blue color and white streaks; unlike Lapis Lazuli, Sodalite lacks gold-colored pyrite specks. Found commony in Bancroft (Canada), Brazil, Namibia, and Russia. Collectors should look for a greasy luster and check for fluorescence.

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