mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 on Mohs scale; Color: royal blue with white or grey veins of calcite; Luster: vitreous to greasy; Crystal Structure: Isometric (cubic); Specific Gravity: 2.27-2.33.

Hardness: 5
Color: royal blue with white or grey veins of calcite
Luster: vitreous to greasy

Identified July 14, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: royal blue with white or grey veins of calcite; Luster: vitreous to greasy; Crystal Structure: Isometric (cubic); 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 environments. It crystallizes from alkaline magmas.

Uses & applications

Used primarily as a decorative stone, in jewelry (beads, cabochons), carvings, and as a popular specimen for collectors.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada, earning it the nickname 'Princess Blue' after Princess Margaret of England.

Field identification & locations

Identify by its deep blue color and characteristic white calcite streaks. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite specks and has a lower density. Found in Brazil, Canada, Namibia, and Russia.