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, translucent to opaque, Mohs hardness 5.5–6, cubic crystal system, poor cleavage, and specific gravity about 2.25–2.35. The rounded shape 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 complexes—through magmatic crystallization; deposits range from Precambrian to younger ages. Common sources include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used as a decorative stone, cabochon, bead, carving material, and inexpensive jewelry or lapidary specimen; rarely used industrially.

Geological facts

Its blue color resembles lapis lazuli, but sodalite generally lacks abundant metallic pyrite flecks. Some sodalite fluoresces orange under ultraviolet light.

Field identification & locations

Identify by blue coloration, white calcite matrix, moderate hardness, and lack of strong metallic flecks; avoid acid or destructive tests on polished pieces. Common tumbled material is widely sold from Canadian and Brazilian deposits.