mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to gray-violet with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to gray-violet with white calcite inclusions
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to gray-violet with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, specifically in nepheline syenites and phonolites. It is found in silica-deficient environments and does not occur in rocks containing quartz.

Uses & applications

Commonly used in jewelry for cabochons and beads, ornamental carvings, architectural slabs, and as a less expensive alternative to Lapis Lazuli.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially important in 1891 after vast deposits were found in Ontario, Canada, during a royal visit; it is sometimes called 'Princess Blue'. Unlike Lapis Lazuli, it rarely contains golden pyrite flecks.

Field identification & locations

Identify in the field by its distinct rich blue color and white calcite veining. It often fluoresces bright orange under long-wave UV light. Major locations include Bancroft (Ontario), Brazil, Namibia, and Russia.