mineral

Tumbled blue sodalite

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

AI-generated identification · may be incorrect

Identified September 4, 2026More mineral →

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Physical properties

Typically deep royal blue with white calcite veining, vitreous to greasy luster, and opaque to translucent appearance; Mohs hardness 5.5–6, cubic crystal system, poor cleavage, and specific gravity about 2.2–2.4. The pictured piece is polished/tumbled and may also be blue-dyed stone, so identification is visual rather than definitive.

Formation & geological history

Sodalite forms in silica-poor, alkaline igneous rocks such as nepheline syenite and occasionally in metamorphic settings, generally during Precambrian to younger geological episodes. Major sources include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used as an ornamental stone, cabochon, carving material, and inexpensive lapidary specimen; it is not a major industrial mineral. Common tumbled pieces typically sell for $2–$10, while larger high-quality specimens or carvings may reach $20–$100.

Geological facts

Natural sodalite commonly shows irregular white calcite patches or veins and a strong blue color, sometimes with gray or black areas. It can be confused with lapis lazuli, but lapis usually contains golden pyrite flecks.

Field identification & locations

Field identification relies on intense blue color, white veining, moderate hardness, and lack of metallic pyrite; a streak test is usually white. Commonly found in alkaline igneous complexes, especially Ontario, Canada.