Sodalite

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, grey, or purple with white calcite veining; 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. It can also form during metasomatism of calcareous rocks. It typically crystallizes from late-stage hydrothermal fluids.

Uses & Applications

Used primarily in jewelry as cabochons or beads, ornamental carvings, and as a decorative stone in architecture (slabs for countertops or tiles).

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains gold-colored pyrite specks. It was famously discovered in Greenland in 1811 but became popular in Canada after a deposit was found during a Royal visit by Princess Margaret.

Field Identification & Locations

Identify in the field by its deep blue color and characteristic white streaks of calcite. It is commonly found in Bancroft (Ontario, Canada), Namibia, Brazil, and Greenland. It will often fluoresce orange or yellow under UV light.

Identified on: 4/16/2026

Mode: Standard