mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs scale), Color: Royal blue with white calcite streaks, Luster: Vitreous to greasy, Crystal structure: Cubic, Cleavage: Poor, Specific gravity: 2.27-2.33

Hardness: 5

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Royal blue with white calcite streaks, Luster: Vitreous to greasy, Crystal structure: Cubic, Cleavage: Poor, Specific gravity: 2.27-2.33

Formation & geological history

Found in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites) and sometimes in contact metamorphic rocks.

Uses & applications

Ornamental carvings, jewelry, tumbled stones, and occasionally used as a blue pigment.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada, during a royal visit; it is sometimes called 'Princess Blue'.

Field identification & locations

Look for the characteristic deep blue color often paired with white veins of calcite. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks. Found in Canada, Brazil, and Namibia.