mineral

Polished sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly sodalite-rich rock

AI-generated identification · may be incorrect

Deep royal-blue to gray-blue with white veining, vitreous to greasy luster, typically massive rather than visibly crystalline; Mohs hardness 5.5–6, poor cleavage, specific gravity about 2.2–2.4. The rounded shape indicates a polished or tumbled specimen.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in silica-poor, alkali-rich igneous rocks such as nepheline syenite and related pegmatites, commonly during Precambrian to younger alkaline magmatism. The photograph alone cannot establish a precise age or locality.

Uses & applications

Used as an ornamental stone for cabochons, beads, carvings, and polished stones; occasionally used as a decorative building stone. It is generally less valuable than high-grade lapis lazuli, though attractive pieces are collectible.

Geological facts

Sodalite’s blue color comes largely from sulfur-related defects and impurities; white patches commonly consist of calcite or feldspathic minerals. It is often confused with lapis lazuli, but usually lacks abundant metallic-gold pyrite flecks.

Field identification & locations

Identify it by its vivid blue color, white calcite-like veining, moderate hardness, and relatively low density; a streak test is usually white. Common sources include Canada, Brazil, Namibia, Russia, and Afghanistan.