mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

Hardness: 5
Color: Royal blue to dark blue with white streaks
Luster: Vitreous to greasy

Identified June 8, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to dark blue with white streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; 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 can also occur in contact metamorphic zones.

Uses & applications

Primarily used as an ornamental stone, for carvings, and in jewelry (beads and cabochons). It is also sometimes used in industrial applications for its ability to change color under radiation (hackmanite variety).

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when vast deposits were found in Ontario, Canada, earning it the nickname 'Princess Blue' after a royal visit.

Field identification & locations

Identify in the field by its deep blue color and white streaks/veins of calcite. Unlike Lapis Lazuli, it typically lacks pyrite (gold flecks) and has a lower specific gravity. Commonly found in Canada, Brazil, Namibia, and Russia.