mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 on Mohs scale. Color: Royal blue to greyish blue, often with white calcite veining. Luster: Vitreous to greasy. Crystal Structure: Cubic. Specific Gravity: 2.27-2.33.

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

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale. Color: Royal blue to greyish blue, often with white calcite veining. Luster: Vitreous to greasy. Crystal Structure: Cubic. Specific Gravity: 2.27-2.33.

Formation & geological history

Forms in silica-poor igneous rocks such as nepheline syenites and phonolites. It is also found in contact metamorphic rocks. It often occurs in mass form rather than distinct crystals.

Uses & applications

Used primarily as a decorative stone for lapidary work, jewelry (beads, cabochons), and ornamental carvings. Historically used as a blue pigment in some regions.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially popular after a large deposit was found in Ontario, Canada, in 1891 during a royal visit, earning it the nickname 'Princess Blue'.

Field identification & locations

Field identification is based on its deep blue color and association with white calcite. Unlike Lapis Lazuli, it rarely contains golden pyrite specks. Found in Canada, Brazil, Namibia, and the USA. Collectors look for even color saturation.