mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5 to 6 on Mohs scale; Color: typically Royal Blue with white calcite veins; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Specific Gravity: 2.27 to 2.33.

Hardness: 5
Color: typically Royal Blue with white calcite veins
Luster: Vitreous to greasy

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6 on Mohs scale; Color: typically Royal Blue with white calcite veins; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); 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 form during metasomatic processes in contact metamorphic zones.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and beads), ornamental carvings, and architectural finishing in luxury decor.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions. It is nicknamed 'Princess Blue' after Princess Margaret of England visited a mine in Ontario, Canada.

Field identification & locations

Identify by its deep blue color and white streaks; it is often fluorescent under UV light. Commonly found in Bancroft (Ontario), Brazil, Greenland, and Namibia.