mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to lavender blue, often with white calcite inclusions; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (alkaline rocks) like nepheline syenites and phonolites, as well as in contact metamorphic rocks. It develops in environments where there is a lack of available silica to form feldspars.

Uses & applications

Used primarily for ornamental purposes, jewelry (beads, cabochons), carvings, and as a collector's specimen. It is also used as a decorative stone in architecture.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains pyrite specks and has a lower specific gravity. It was first discovered in Greenland in 1811 and became popular after large deposits were found in Ontario, Canada during a royal visit in 1901.

Field identification & locations

Identify by its rich blue color and characteristic white streaks of calcite. It will fluoresce a bright orange-yellow under long-wave UV light. Common locations include Bancroft (Canada), Brazil, Greenland, and Namibia.