mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Typically deep royal-blue to gray-blue with white calcite veining or patches; vitreous to greasy luster, Mohs hardness 5.5–6, imperfect cleavage, and a cubic crystal structure. The rounded, glossy form indicates tumbling and polishing.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenites and related alkaline intrusions, generally in Precambrian to younger continental settings. Common localities include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and inexpensive lapidary specimen; rarely used as a minor source of pigments or decorative stone.

Geological facts

Sodalite is often confused with lapis lazuli, but lapis commonly contains visible golden pyrite and is a rock mixture rather than a single mineral. Its blue color comes largely from sulfur-related defects in the crystal lattice.

Field identification & locations

Identify it by its blue-gray color, white calcite mottling, moderate hardness, and lack of abundant pyrite; a streak is white, and it generally does not react strongly with dilute acid. This is most likely a polished/tumbled specimen.