mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Typically deep blue to blue-gray with white veining, vitreous to greasy luster, and indistinct cleavage; Mohs hardness 5.5–6, cubic crystal system, and specific gravity about 2.27–2.33. The smooth, rounded surfaces indicate tumbling and polishing.

Identified August 15, 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. Most gem-quality material comes from Canada, Brazil, Namibia, and Russia; specimens generally formed during Precambrian to younger igneous events.

Uses & applications

Used as a decorative stone, beads, cabochons, carvings, polished stones, and architectural ornament. It is popular as an inexpensive lapidary and collection material rather than a high-value gemstone.

Geological facts

Sodalite is commonly confused with lapis lazuli, but lapis usually contains golden pyrite flecks and abundant calcite. Strong blue color can fade under prolonged sunlight or heat.

Field identification & locations

Identify it by its royal-blue color, relatively low hardness, white calcite-like veining, and lack of metallic pyrite flecks. In the field, it occurs as blue grains or masses in pale alkaline igneous rock.