mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

Hardness: 5
Color: Royal blue to gray-blue, often with white calcite veining
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites, phonolites, and related rock types. Often found in hydrothermal environments or metasomatic limestone contact zones.

Uses & applications

Mostly used for ornamental carvings, beads, cabochons for jewelry, and occasionally as architectural stone or countertops. It is also an important specimen for mineral collectors.

Geological facts

Sodalite was first discovered by Europeans in Greenland in 1811 but became popular in Canada after 1901 when vast deposits were found in Ontario. It is often confused with Lapis Lazuli, but Sodalite lacks the glittery pyrite inclusions typical of Lapis.

Field identification & locations

Identify in the field by its distinct royal blue color and consistent white (calcite) streaks. Unlike Lapis Lazuli, Sodalite has a lower specific gravity and lacks brassy pyrite specks. It may fluoresce a bright orange-red under UV light.