mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.4

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

Identified May 20, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.4

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic rocks. It crystallizes from alkaline magmas.

Uses & applications

Primarily used as an ornamental stone for carvings, beads, and cabochons in jewelry. It is also used in architectural surfacing like countertops and tiles.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains gold-colored pyrite specks. Many specimens exhibit strong orange or pink fluorescence under UV light.

Field identification & locations

Identify in the field by its distinct deep blue color and white streaks; look for it in alkaline igneous provinces like those in Ontario, Canada, or Namibia. Testing with UV light is a common identification technique.