mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

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

Identified May 12, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It crystallizes from sodium-rich magmas in the late stages of magmatic differentiation.

Uses & applications

Primarily used as a gemstone, for decorative carvings, and as architectural stone for countertops or veneers. Also valued as a collector specimen and in metaphysical practices.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when vast deposits were found in Ontario, Canada, during a visit by British royalty—earning it the nickname Princess Blue.

Field identification & locations

Identify by its deep blue color and characteristic white streaks of calcite. Unlike Lapis Lazuli, it rarely contains gold flecks of pyrite and has a lower specific gravity. It is commonly found in Canada, Brazil, and Namibia.