Mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to greyish-blue with white/veined inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27–2.33

Hardness: 5
Color: Royal blue to greyish-blue with white/veined inclusions
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to greyish-blue with white/veined inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27–2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic environments. It is a feldspathoid mineral often associated with alkali-rich magma.

Uses & applications

Used primarily for ornamental purposes, jewelry (beads and cabochons), carvings, and as a decorative stone in architecture. Occasionally used as a pigment or a source of aluminum in specific industrial niches.

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the gold-colored pyrite specks typically found in Lapis. It was famously discovered in Greenland in 1811 and became popular when Princess Margaret of England visited Bancroft, Ontario, and fell in love with its appearance.

Field identification & locations

Identify by its deep blue color and characteristic white calcite veins. Under long-wave UV light, many specimens exhibit a strong orange-yellow fluorescence. Commonly found in Bancroft (Canada), Brazil, and Namibia.