mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs). Color: Royal blue to greyish blue, often with white calcite veining. Luster: Vitreous to greasy. Crystal structure: Isometric (cubic). Cleavage: Poor. Specific gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to greyish blue, often with white calcite veining
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic zones (skarns). Most specimens range from Precambrian to Cenozoic in age depending on the local geology.

Uses & applications

Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a dimension stone for high-end architectural countertops and tiles.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains pyrite and has a lower density. It is known for its ability to fluoresce under UV light, commonly glowing a bright orange-yellow.

Field identification & locations

Identify in the field by its distinct royal blue color mottled with white calcite and its lack of pyrite flecks. Frequently found in Bancroft (Canada), Namibia, Brazil, and Greenland. Collectors look for deep color and minimal fractures.