mineral

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

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

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

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey-blue with white calcite inclusions; 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. It can also occur in contact metasomatic rocks. Typical ages range from Precambrian to Cenozoic depending on the host rock formation.

Uses & applications

Used primarily for ornamental carvings, cabochons for jewelry, and as a semi-precious gemstone. Sometimes used as a source of pigment or for interior design (countertops and tiles).

Geological facts

Sodalite was first discovered by Europeans in Greenland in 1811, but it didn't become popular as an ornamental stone until a large deposit was found in Ontario, Canada, in 1891 during a royal visit, leading it to be known as 'Princess Blue'.

Field identification & locations

Identify in the field by its rich blue color and characteristic white veins of calcite. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks. Common locations include Brazil, Canada (Bancroft), Namibia, and Russia. It often fluoresces bright orange under UV light.