mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to violet-blue, often with white streaks; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33

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

Identified July 3, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to violet-blue, often with white streaks; 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, as well as in contact metamorphic rocks. It belongs to the sodalite group of tectosilicates.

Uses & applications

Used primarily as an ornamental gemstone, for carvings, jewelry (beads/cabochons), and as an architectural stone for countertops and tiles.

Geological facts

Sodalite gained fame in the 1800s after discovery in Greenland and later Canada; it became known as 'Princess Blue' because Princess Margaret of England chose it for her interior decor in Marlborough House.

Field identification & locations

Identify in the field by its deep blue color and characteristic white calcite veining. Unlike Lapis Lazuli, it rarely contains brassy pyrite flecks and is more translucent. Large deposits are found in Brazil, Namibia, Canada, and Russia.