Sodalite

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.

Identified on: 5/10/2026

Mode: Standard