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; 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 May 27, 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; 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 metasomatized limestones. Primarily found in alkali-rich volcanic environments.

Uses & applications

Used extensively in jewelry as beads and cabochons, for ornamental carvings, and as a decorative stone in architectural accents. It's also a popular collector's mineral.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially important after a large deposit was found in Ontario, Canada in 1891, which was visited by Princess Margaret of England, leading to its nickname 'Princess Blue'.

Field identification & locations

Identify in the field by its distinct deep blue color often mottled with white calcite and its lack of brassy pyrite inclusions (which distinguishes it from Lapis Lazuli). It will often fluoresce orange under ultraviolet light. Found in Canada, Brazil, Namibia, and Russia.