mineral

Polished sodalite cabochon

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with calcite or feldspar veining

AI-generated identification · may be incorrect

Typically deep royal-blue to gray-blue with white, gray, or golden matrix; vitreous to greasy luster, massive granular structure, poor cleavage, Mohs hardness 5.5–6, and specific gravity about 2.25–2.แน. The pictured specimen is polished and cabochon-shaped.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks—especially nepheline syenites and related pegmatites—through late-stage crystallization; commonly Precambrian to younger in age. Blue color results from sulfur-related defects in the crystal structure.

Uses & applications

Used as an ornamental stone, beads, cabochons, carvings, and decorative objects; occasionally used as a blue pigment or architectural stone. It is an affordable alternative to lapis lazuli.

Geological facts

Sodalite is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite and includes lazurite rather than predominantly sodalite. It may fluoresce orange under ultraviolet light.

Field identification & locations

Identify by its strong blue color, relatively low hardness, white veining, and lack of abundant metallic pyrite; a streak test is white, though polished surfaces should not be scratched. Common sources include Canada, Brazil, Namibia, Russia, and Afghanistan.