mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33.

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

Identified April 9, 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 form in contact metamorphic zones of marbles. It is a member of the feldspathoid group.

Uses & applications

Primarily used in jewelry (cabochons and beads), decorative carvings, and as a popular specimen for collectors. In larger quantities, it can be used as an ornamental stone in interior design.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became stones popular when a large deposit was found in Ontario, Canada in 1891, subsequently nicknamed 'Princess Blue' after Princess Margaret visited the site.

Field identification & locations

Identify by its deep blue color and characteristic white calcite streaks. Unlike Lapis Lazuli, Sodalite rarely contains golden pyrite specks. It will often fluoresce orange or bright pink under ultraviolet light. Found in Canada, Brazil, Bolivia, and Namibia.