mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to greyish-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic (isometric); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to greyish-blue with white calcite inclusions
Luster: Vitreous to greasy

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites and pegmatites) via late-stage magmatic processes; can also form in contact metamorphosed marbles and skarns. Age varies by deposit but is found in ancient cratons globally.

Uses & applications

Used primarily as a gemstone for beads and cabochons, ornamental carvings, and architectural surfaces like countertops. In industry, it is a minor source of soda and alum.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains flecks of golden pyrite. It was famously discovered in Greenland in 1811 and gained popularity after Princess Margaret of England visited the Canadian Bancroft deposit in 1901.

Field identification & locations

Identify in the field by its intense blue color and white streaks, lack of pyrite, and low density. Commonly found in Bancroft (Canada), Bahia (Brazil), and Namibia. Collectors should look for fluorescent properties, as some specimens glow bright orange under UV light.