mineral

Polished sodalite crescent cabochons

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Deep royal-blue, white veining or mottling, vitreous to greasy luster, typically massive rather than visibly crystalline; Mohs hardness 5.5–6, poor cleavage, specific gravity about 2.25–2.35. These are shaped and polished gemstone pieces.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich alkaline igneous rocks—especially nepheline syenites and related pegmatites—through magmatic crystallization; deposits are generally Precambrian to younger. Common sources include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used for cabochons, carvings, beads, ornamental objects, and inexpensive jewelry; also collected as a lapidary stone. It is not generally used as a major construction material.

Geological facts

Sodalite’s blue color resembles lapis lazuli, but lapis commonly contains golden pyrite and is a rock mixture. Exposure to strong acids can damage it, and prolonged sunlight may fade some material.

Field identification & locations

Identify by its saturated blue color, white calcite-like patches, moderate hardness, and lack of pyrite flecks; it is softer than quartz and can be scratched by a steel file. Typical polished value is about $5–$25 per pair, or $20–$75 for especially large, well-finished pieces.