mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Cobalt blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Cobalt blue with white calcite streaks
Luster: Vitreous to greasy

Identified May 19, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Cobalt blue with white calcite streaks; 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 through late-stage hydrothermal processes or crystallization of alkali-rich magmas.

Uses & applications

Used primarily for ornamental carvings, beads in jewelry, and tumbled stones for collectors; historically used as a blue pigment.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada, during a visit by Princess Margaret, leading to the nickname 'Princess Blue'.

Field identification & locations

Identified by its rich blue color and characteristic white veins. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks. Common locations include Brazil, Namibia, Canada, and Russia.