mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue with white calcite streaks
Luster: Vitreous to greasy

Identified July 11, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Gravity: 2.27-2.33.

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, particularly nepheline syenites and related rock types. Often found in hydrothermal veins.

Uses & applications

Used primarily as an ornamental stone, for beads, cabochons in jewelry, and decorative carvings. It is also a popular specimen for mineral collectors.

Geological facts

Sodalite was famously discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada, in 1891, specifically after Princess Patricia of Connaught visited and chose it for interior decoration at Marlborough House.

Field identification & locations

Can be identified by its characteristic deep blue color and association with white calcite streaks. Unlike Lapis Lazuli, it rarely contains pyrite (gold-flecked) inclusions. It fluoresces bright orange under long-wave UV light.