mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; likely a sodalite-rich nepheline-syenite fragment

AI-generated identification · may be incorrect

Hardness 5.5–6 Mohs; deep royal blue with white calcite veining and minor brown inclusions; vitreous to greasy luster, usually massive rather than visibly crystalline, with poor cleavage. Specific gravity is approximately 2.2–2.4.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a feldspathoid mineral in silica-poor, alkaline igneous rocks such as nepheline syenite; specimens commonly formed in Precambrian to younger alkaline complexes. The pictured piece has been cut and polished/tumbled.

Uses & applications

Used as an ornamental stone, cabochon, bead, and inexpensive lapidary material; larger sodalite-bearing rock is used decoratively. It is generally a modest-value collector stone.

Geological facts

Its blue color comes mainly from sulfur-related defects and color centers in the crystal structure; exposure to strong heat or acids can alter its appearance. It is commonly confused with lapis lazuli, but typically lacks abundant brassy pyrite.

Field identification & locations

Identify by its saturated blue color, white calcite veining, moderate hardness, and lack of pyrite; common sources include Canada, Brazil, Namibia, and Russia. Estimated value: $3–$15 for a small polished/tumbled piece, or $20–$100+ for high-quality cabochons.