mineral

Sodalite

Sodalite Na8(Al6Si6O24)Cl2

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

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

Identified May 22, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites or phonolites, as well as in contact metamorphic zones. Primarily found in alkali-rich volcanic environments.

Uses & applications

Used extensively as a gemstone for jewelry, ornamental carvings, and decorative architectural slabs. Also valued by crystal collectors for its aesthetic appeal.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, Sodalite 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 combined with white veining and lack of pyrite. Commonly found in Bancroft (Ontario, Canada), Greenland, Brazil, and Namibia.