Sodalite

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue with white calcite streaks; 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. It crystallizes from sodium-rich magmas and is often found in pegmatitic environments.

Uses & Applications

Used primarily as a decorative gemstone for jewelry, cabochons, and beads. Also used for ornamental carvings, architectural accents, and as a popular specimen for mineral collectors.

Geological Facts

Sodalite was first discovered in Greenland in 1811 but became commercially popular after large deposits were found in Ontario, Canada, during a royal visit by Princess Margaret in 1901. It is often called 'Princess Blue' in her honor.

Field Identification & Locations

Identify in the field by its distinct royal blue color and characteristic white veins of calcite. Unlike Lapis Lazuli, Sodalite rarely contains gold-colored pyrite specks. It is commonly found in Brazil, Canada, Namibia, and Russia.

Identified on: 4/25/2026

Mode: Standard