mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue, mottled with white veins
Luster: Vitreous to greasy

Identified May 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white veins; 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, as well as in contact metamorphic rocks where sodium was introduced through metasomatism.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons and beads), ornamental carvings, and architectural accents like countertops or tiles.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions and has a lower specific gravity. It was famously popular in the UK after Princess Margaret visited the 'Princess Blue' deposit in Ontario, Canada.

Field identification & locations

Identified by its distinctive royal blue color paired with white calcite veining. It fluoresces a bright orange-yellow under UV light. Commonly found in Canada (Bancroft), Brazil, Namibia, and Russia.