mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0; Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Specific gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, mottled with white veins
Luster: Vitreous to greasy

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0; Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Specific gravity: 2.27-2.33

Formation & geological history

Found primarily in igneous rocks that crystallized from sodium-rich magmas, particularly nepheline syenites and phonolites. Large occurrences are found in the Bancroft, Ontario, and Greenland areas.

Uses & applications

Used as a gemstone, for carvings, decorative architectural stones, and as an ornamental mineral for collectors. It is also a member of the feldspathoid group.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite lacks the pyrite (gold-colored) inclusions found in Lapis. It was first discovered in Greenland in 1811 and became popular after large deposits were found in Ontario during a royal visit.

Field identification & locations

Identify by its distinctive rich blue color and white calcite veining. Unlike Lapis Lazuli, it has a lower specific gravity and rarely contains golden pyrite flecks. Frequently found in regions with alkaline igneous rocks.