mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8Al6Si6O24Cl2)

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue to grey-blue with white calcite veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Color: typically royal blue to grey-blue with white calcite veins
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor igneous rocks (nepheline syenites and phonolites) through late-stage crystallization from magma or hydrothermal replacement. It is common in alkaline igneous complexes globally.

Uses & applications

Primarily used as an ornamental stone for carvings, beads, and cabochons in jewelry. Also used as dimension stone (architectural cladding) and as a pigment in some artist paints.

Geological facts

Sodalite is often confused with Lapis Lazuli, but lacks the gold-colored pyrite inclusions common in Lapis. It was first discovered in Greenland in 1811 but became famous after a visit by the Princess of Wales in Ontario, Canada, in 1901, leading to its nickname 'Princess Blue'.

Field identification & locations

Identify by its characteristic royal blue color and the presence of white (usually calcite) veining. It often fluoresces bright orange under UV light. It is commonly found in Canada (Bancroft), Namibia, and Brazil. For collectors, look for high-intensity blue and minimal grey/brown staining.

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