mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to violet-blue, often with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

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

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (alkaline magmas) like nepheline syenites and phonolites, as well as in contact metamorphic zones; occurs in large massive forms.

Uses & applications

Primarily used as an ornamental gemstone, for cabochons in jewelry, and for carvings. It is also a popular collector's mineral due to its intense blue color.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada. It is often called 'Princess Blue' in honor of Princess Patricia of Connaught. Many specimens exhibit orange fluorescence under UV light.

Field identification & locations

Identify in the field by its deep blue color and characteristic white veins; unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks. Found in Brazil, Canada, Namibia, and Russia. Use a UV light to check for the distinctive 'Hackmanite' glow.