Sodalite

Physical Properties

Hardness: 5.5–6 (Mohs scale), Color: Rich royal blue to violet-blue with white calcite veining, 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 can also occur in contact metamorphosed marbles. It belongs to the sodalite group of tectosilicates.

Uses & Applications

Primarily used as an ornamental gemstone for carvings, beads, and cabochons. It is also used in architectural projects as a luxury stone for countertops and tiles.

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite inclusions and is significantly lower in density. It also typically exhibits a bright orange fluorescence under UV light.

Field Identification & Locations

Look for a deep blue color with white streaks of calcite. Unlike Lapis, it lacks the golden metallic flecks of pyrite. Commonly found in Bancroft (Ontario, Canada), Namibia, and Brazil.

Identified on: 4/13/2026

Mode: Standard