mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to gray-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Isometric (cubic form); Fracture: Uneven to conchoidal.

Hardness: 5
Color: Royal blue to gray-blue with white calcite inclusions
Luster: Vitreous to greasy

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to gray-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Isometric (cubic form); Fracture: Uneven to conchoidal.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, often through hydrothermal alteration. Common in plutonic rock environments.

Uses & applications

Used primarily as a decorative stone, in jewelry (beads, cabochons), and as an ornamental material for carvings or integrated into countertops.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains yellow pyrite flecks. It was first discovered in Greenland in 1811 and became popular when a large deposit was found in Ontario, Canada, in the late 19th century.

Field identification & locations

Identified by its rich blue color with contrasting white veins/mottling and lack of pyrite. It is found in significant quantities in Namibia, Brazil, Canada, and the USA.