mineral

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/Indistinct; Specific Gravity: 2.27-2.33.

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

Identified March 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites or phonolites. It can also occur in contact metamorphic rocks where sodium-rich fluids have altered limestone. It is found in deposits ranging from Precambrian to more recent igneous intrusions.

Uses & applications

Primarily used as an ornamental gemstone for cabochons, beads, and carvings. Also used in industrial applications as a component in certain pigments and as a decorative architectural stone (countertops/tiles).

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the golden pyrite flecks common in Lapis. It is known for its ability to fluoresce under UV light, often appearing brilliant orange or pink.

Field identification & locations

Identify in the field by its deep blue color, white calcite inclusions, and lack of pyrite. Common locations include Bancroft (Canada), Brazil, Namibia, and Greenland. Collectors should look for 'Yooperlites'—a specific syenite variety containing fluorescent sodalite.