mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to grey-blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Cubic, Cleavage: Poor, Specific gravity: 2.2-2.3.

Hardness: 5

Identified July 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to grey-blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Cubic, Cleavage: Poor, Specific gravity: 2.2-2.3.

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, such as nepheline syenites. Also found in contact metamorphic rocks.

Uses & applications

Mainly used as a gemstone for jewelry, ornamental carvings, and large slabs for internal architectural features like countertops.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, it rarely contains golden specks of pyrite. It is also known to fluoresce bright orange or yellow under ultraviolet light.

Field identification & locations

Identify by its rich blue color and white veins, lacks the pyrite of lapis lazuli. Common locations include Canada (Bancroft, Ontario), Brazil, Namibia, and Russia. Collectors value the intensity of the blue.