mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to deep navy with white veining (calcite inclusions), Luster: Vitreous to greasy, Crystal Structure: Cubic, Cleavage: Poor, Specific Gravity: 2.2-2.3

Hardness: 5

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale), Color: Royal blue to deep navy with white veining (calcite inclusions), Luster: Vitreous to greasy, Crystal Structure: Cubic, Cleavage: Poor, Specific Gravity: 2.2-2.3

Formation & geological history

Forms in sodium-rich igneous rocks such as nepheline syenites and phonolites. It crystallizes in silica-deficient environments where quartz is absent.

Uses & applications

Commonly used for ornamental carvings, gemstone beads for jewelry, cabochons, and as a decorative stone in architecture (slabs and tiles).

Geological facts

Sodalite was first discovered in Greenland in 1811 and became popular when a Large deposit was found in Ontario, Canada, during a royal visit by Princess Margaret. It is often confused with Lapis Lazuli but lacks the golden pyrite inclusions found in Lapis.

Field identification & locations

Identify by its rich blue color and characteristic white calcite veins. Unlike Lapis, it rarely contains pyrite. It is found in locations like Bancroft (Ontario), Greenland, Brazil, and Namibia. For collectors, check for fluorescence under UV light, as some specimens glow bright orange.