mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5 to 6 on Mohs scale; Color: typically rich royal blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Specific Gravity: 2.27 to 2.33

Hardness: 5
Color: typically rich royal blue with white calcite streaks
Luster: Vitreous to greasy

Identified April 28, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6 on Mohs scale; Color: typically rich royal blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Specific Gravity: 2.27 to 2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, and occasionally in contact metamorphosed marbles. Most deposits are found in alkaline-rich pegmatites.

Uses & applications

Commonly used in jewelry as cabochons, as ornamental stones for carvings, and in industrial settings as a component in certain ceramics or pigments.

Geological facts

Sodalite is a member of the sodalite group, which also includes minerals like lazurite and hauyne. It was famously discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada, during a visit by the Princess of Wales.

Field identification & locations

Identify by its distinctive blue color, lack of pyrite (unlike Lapis Lazuli), and white calcite inclusions. It often glows bright orange under long-wave UV light. Common locations include Canada (Bancroft), Namibia, and Brazil.