mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

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

Hardness: 5
Color: Royal blue to greyish-blue with white calcite veins
Luster: Vitreous to greasy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites and phonolites) or occasionally in contact metamorphic rocks. It develops in environments where there is not enough silica to form feldspars.

Uses & applications

Primarily used as a decorative gemstone in jewelry, carvings, and architectural ornamentation (slabs/tiles). It is also of high interest to mineral collectors and as a source of sodium in certain industrial applications.

Geological facts

Sodalite is often confused with Lapis Lazuli; however, Sodalite lacks the golden pyrite specks characteristic of Lapis. It is known as the 'Princess Blue' in Canada after Princess Margaret visited the Bancroft mines in Ontario in 1901.

Field identification & locations

Identification includes its distinctive blue color, white calcite streaks, and its tendency to fluoresce orange-red under long-wave UV light. Commonly found in Canada (Ontario), Brazil, Namibia, and Russia. Collectors should look for deep blue color and minimal grey inclusions.