mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey-blue with white calcite veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to grey-blue with white calcite veins
Luster: Vitreous to greasy

Identified June 7, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey-blue with white calcite veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in sodium-rich igneous rocks, particularly nepheline syenites and other silica-undersaturated plutonic rocks. It crystallization occurs at the late stages of magmatic differentiation.

Uses & applications

Primarily used as an ornamental gemstone, for jewelry (beads, cabochons), carvings, sculptures, and architectural veneer. It is also a popular collector's mineral.

Geological facts

Sodalite is a member of the feldspathoid group. It is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks. It famously fluoresces bright orange under UV light.

Field identification & locations

Identify by its deep blue color and white streaks/veins. To distinguish from Lapis, look for the absence of pyrite and presence of white calcite. Commonly found in Canada (Bancroft), Greenland, Brazil, and Namibia.