mineral

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with white calcite or nepheline

AI-generated identification · may be incorrect

Hardness 5.5–6 Mohs; deep royal-blue to blue-gray with irregular white veining or patches; vitreous to greasy luster; typically massive rather than visibly crystalline, with poor cleavage. The rounded surface indicates tumbling or polishing.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks—especially nepheline syenite and related alkaline complexes—by crystallization from magma. Major deposits are generally Precambrian to Mesozoic in age, including regions of Canada, Brazil, Namibia, and Russia.

Uses & applications

Used as an ornamental stone, beads, cabochons, carvings, and inexpensive jewelry; polished pieces are also popular mineral specimens. It has limited industrial use.

Geological facts

Sodalite is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite and more abundant calcite. Its blue color comes mainly from sulfur-related defects in the crystal structure.

Field identification & locations

Identify it by the intense blue color, white calcite veining, moderate hardness, and lack of pyrite sparkle; a streak test is usually white. Common sources include Ontario and Quebec, Canada, and Brazil.