Sodalite

Physical Properties

Hardness: 5.5-6 (Mohs); Color: Royal blue, grey, or white with streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Formation & Geological History

Forms in silica-poor igneous rocks such as nepheline syenites or phonolites. It is a tectosilicate mineral and often occurs in alkaline pegmatites.

Uses & Applications

Primarily used in jewelry as beads or cabochons, as an ornamental stone for carvings or countertops, and as a popular collector specimen. Sometimes used as a source of alumina in specific industrial processes.

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks and usually features white calcite veins. It is known for its ability to fluoresce bright orange or yellow under ultraviolet light.

Field Identification & Locations

Identify in the field by its deep blue color, white streaks, and lack of pyrite. It is commonly found in Brazil, Canada (Bancroft, Ontario), Namibia, and Russia. Collectors value deep blue specimens with high translucency.

Identified on: 5/14/2026

Mode: Standard