mineral

Tumbled blue sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Deep royal-blue, translucent to opaque material with white-gray veining and a vitreous-to-waxy polish; Mohs hardness 5.5–6, typically massive rather than visibly crystalline, with poor cleavage and specific gravity about 2.2–2.4.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich alkaline igneous rocks such as nepheline syenite, crystallizing from late-stage magmatic fluids. Most gem sodalite is Precambrian to Paleozoic in host rocks, though exact age depends on locality.

Uses & applications

Used for carvings, cabochons, beads, tumbled stones, ornamental objects, and lapidary display; it is an affordable jewelry and collector material.

Geological facts

Its vivid blue color resembles lapis lazuli, but sodalite generally lacks abundant metallic-gold pyrite. Exposure to strong acids can damage it, and prolonged sunlight may fade some specimens.

Field identification & locations

Identify it by royal-blue color, white calcite-like veining, moderate hardness, and a streak that is generally white to pale blue; common sources include Canada, Brazil, Namibia, and Russia. Estimated value: $3–$20 for a small tumbled stone, or $20–$100+ for quality larger material.