mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Blue to blue-gray with white veining or patches, vitreous to greasy luster, usually massive rather than visibly crystalline; Mohs hardness 5.5–6, imperfect cleavage, and specific gravity about 2.25–2.35.

Identified September 13, 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 rocks—through late magmatic crystallization; most gem sodalite is geologically Precambrian to younger, depending on deposit.

Uses & applications

Commonly sold as inexpensive tumbled stones, beads, cabochons, carvings, and ornamental stone; too soft and cleavage-prone for highly durable jewelry or major construction use.

Geological facts

Its rich blue color is caused primarily by sulfur-related defects in the crystal structure; white areas are commonly calcite or nepheline. It is also the principal mineral in some lapis lazuli specimens, although lapis contains additional minerals such as lazurite and pyrite.

Field identification & locations

Identify by its opaque royal-blue color, white veining, moderate softness, and lack of metallic pyrite flecks; it commonly occurs in Canada, Brazil, Namibia, and Russia. The pictured rounded, polished specimen is consistent with tumbled sodalite, though visual identification alone is not definitive.