mineral

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs scale); Color: Royal blue, mottled with white, grey, or yellow; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Cleavage: Poor; Specific gravity: 2.27-2.33

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

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue, mottled with white, grey, or yellow; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); 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 form during metasomatic processes in calcareous environments. Most deposits are Proterozoic to Cenozoic in age.

Uses & applications

Used primarily for jewelry (cabochons and beads), ornamental carvings, countertops, and floor tiles. It is also a popular specimen for mineral collectors and used in holistic practices.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially significant after a large occurrence was found in Ontario, Canada, during a visit by the Princess of Wales in 1901; it is sometimes called 'Princess Blue' for this reason.

Field identification & locations

Identify by its rich blue color often mixed with white calcite veins. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks. Found commonly in Brazil, Canada (Bancroft), Namibia, and Russia. Collectors look for deep saturation and lack of dull grey patches.