mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (dodecahedral); Cleavage: Poor; Specific gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, mottled with white veins
Luster: Vitreous to greasy

Identified March 15, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (dodecahedral); Cleavage: Poor; Specific gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks like nepheline syenites and phonolites, often crystallizing early in the cooling process. It can also occur in contact metamorphic rocks.

Uses & applications

Primarily used as an ornamental gemstone, for cabochons, carvings, and architectural finishing surfaces like countertops. Also popular for lapidary and chakra-healing collections.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains flecks of golden Pyrite and typically has white calcite veins. It was first discovered in Greenland in 1811 and became famous after Princess Patricia of Connaught used it for interior decoration in Marlborough House.

Field identification & locations

Identify by its characteristic royal blue color and white streaks; it is often fluorescent under UV light (glowing orange/yellow). Common locations include Bancroft (Ontario, Canada), Brazil, Namibia, and Mount Vesuvius.