mineral

Polished blue stone, likely sodalite

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), possibly dyed or dark blue jasper

AI-generated identification · may be incorrect

Small tumbled specimen with deep navy-blue color, subdued vitreous-to-waxy luster, and faint lighter veining or inclusions. Sodalite has Mohs hardness 5.5–6, cubic crystal structure, poor cleavage, and specific gravity about 2.25–2.35.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Sodalite forms in silica-poor, alkali-rich igneous rocks such as nepheline syenite, generally in Precambrian to younger alkaline complexes. The rounded shape is human-produced by tumbling and polishing.

Uses & applications

Used as an ornamental stone for cabochons, beads, carvings, and inexpensive jewelry; larger sodalite is used for decorative stone. Common tumbled pieces have modest collector value.

Geological facts

Natural sodalite is typically blue with white calcite veining; uniform, extremely dark color may indicate dyeing or another blue stone. It is softer and less valuable than lapis lazuli, which commonly contains golden pyrite.

Field identification & locations

Common sources include Canada, Brazil, Namibia, and Russia; identify with white calcite veining, moderate hardness, and lack of pyrite sparkle. A definitive identification requires testing or magnification because the image is low resolution.