mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue, grey, or white
Luster: Vitreous to greasy

Identified June 21, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It typically crystallizes from alkaline magmas and is often found in pegmatitic environments.

Uses & applications

Used primarily as a gemstone in jewelry, for decorative carvings, and as an ornamental stone in architecture. Due to its color, it is also a popular collector's mineral.

Geological facts

Sodalite is a member of the sodalite group of feldspathoids. It is famous for its 'Hackmanite' variety which displays tenebrescence (changing color when exposed to sunlight). It was discovered in 1811 in Greenland.

Field identification & locations

Identify by its rich blue color often streaked with white calcite. Unlike Lapis Lazuli, it rarely contains golden pyrite flecks. Common locations include Canada (notably Bancroft, Ontario), Brazil, Namibia, and Russia.