mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly sodalite-rich rock

AI-generated identification · may be incorrect

Typically deep royal-blue with white veining, translucent to opaque, vitreous to greasy luster, Mohs hardness 5.5–6, cubic crystal system, and poor cleavage. The rounded shape indicates tumbling and polishing; the gray-green surface may reflect matrix or alteration.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite and related alkaline complexes, commonly during late-stage crystallization. Most specimens formed in Precambrian to younger alkaline intrusions.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and decorative objects; prized for its blue color but generally less valuable than lapis lazuli or high-grade sapphire.

Geological facts

Sodalite is a feldspathoid mineral and may fluoresce orange under long-wave ultraviolet light. It is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite grains.

Field identification & locations

Identify by its rich blue color, relatively low hardness, and white calcite-like veining; it is commonly found in Canada, Brazil, Namibia, and Russia. A streak, hardness, or UV test can confirm it, though testing may damage a polished specimen.