mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Isometric, Cleavage: Poor, Specific Gravity: 2.27-2.33

Hardness: 5

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Isometric, Cleavage: Poor, Specific Gravity: 2.27-2.33

Formation & geological history

Commonly occurs in silica-poor igneous rocks such as nepheline syenites and phonolites. It forms during late-stage hydrothermal processes in alkaline environments.

Uses & applications

Used primarily for ornamental purposes, jewelry (beads and cabochons), carvings, and as a collector's specimen.

Geological facts

Sodalite is often confused with Lapis Lazuli, but sodalite lacks the golden pyrite specks found in lapis. It is known for its ability to fluoresce bright orange-yellow under UV light.

Field identification & locations

Look for the intense blue color interrupted by white/grey veins of calcite. Can be identified by its lower specific gravity compared to similar blue minerals. Common locations include Canada (Bancroft), Brazil, and Namibia.