mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to grey-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 grey-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 like nepheline syenites and phonolites, or via metasomatic replacement. It originates primarily in alkaline-rich magmatic environments.

Uses & applications

Used primarily in jewelry (cabochons and beads) and as an ornamental stone for carvings and architectural inlays. Occasionally used as a low-cost substitute for Lapis Lazuli.

Geological facts

Sodalite is often called 'Princess Blue' in Canada because it was discovered in large quantities during a royal visit by Princess Margaret. It is a member of the feldspathoid group and is known for its strong orange-yellow fluorescence under ultraviolet light.

Field identification & locations

Identify in the field by its deep blue color, white streaks (usually calcite), and lack of metallic pyrite flecks seen in Lapis Lazuli. It is commonly found in Brazil (Bahia), Canada (Ontario), Namibia, and Greenland.