Sodalite

Physical Properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to dark blue often with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33

Formation & Geological History

Formed in silica-poor igneous rocks (nepheline syenites and phonolites) through magmatic crystallization or metasomatism. It is a tectosilicate mineral that often occurs as mass fills in veins.

Uses & Applications

Used primarily in jewelry as cabochons or beads, for ornamental carvings, and as a material for architectural surfaces (countertops). Also valued in crystal collecting and metaphysical markets.

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it lacks the golden pyrite inclusions and is generally less expensive. It is frequently nicknamed 'Princess Blue' because it was discovered in Ontario during a royal visit by Princess Margaret in the early 20th century.

Field Identification & Locations

Identify by its rich blue color and characteristic white calcite veins. Unlike Lapis, it has a lower specific gravity (it feels lighter) and no gold-colored specks. Large deposits are found in Bancroft, Ontario; Greenland; Brazil; and Namibia.

Identified on: 4/25/2026

Mode: Standard