Sodalite

Physical Properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue, mottled with white or grey 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 through magmatic processes. It can also form during hydrothermal alteration under specific alkaline conditions.

Uses & Applications

Primarily used as a gemstone for jewelry (beads, cabochons), ornamental carvings, and widely collected as tumbled stones in the metaphysical and rock-collecting communities.

Geological Facts

Sodalite is often confused with Lapis Lazuli, but it rarely contains the golden pyrite specks found in Lapis. It is known for its property of fluorescence under UV light, often glowing orange or pink.

Field Identification & Locations

Identify in the field by its deep blue color and white streaks of calcite or nepheline. It lacks the intense gold pyrite of Lapis Lazuli. Key locations include Bancroft (Ontario, Canada), Namibia, Brazil, and Russia.

Identified on: 5/1/2026

Mode: Standard