mineral

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0; Color: Royal blue, grey; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, grey
Luster: Vitreous to greasy

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0; Color: Royal blue, grey; 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. Often crystallizes from late-stage hydrothermal fluids.

Uses & applications

Used primarily as a gemstone in jewelry (cabochons, beads), decorative carvings, and architectural finishing (slabs, tiles).

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite specks and usually features white calcite veins instead. It was famously discovered in Greenland in 1811.

Field identification & locations

Identify by its rich blue color with white streaks and lack of pyrite. It is found in Bancroft (Ontario), Greenland, Brazil, and Namibia. In the field, look for associated nepheline syenite minerals.