igneous
Blue sodalite-rich rock (likely sodalite syenite)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, in a sodalite-bearing igneous rock
AI-generated identification · may be incorrectThe specimen appears massive, blue-gray with pale veins and a vitreous to dull luster. Sodalite has Mohs hardness 5.5–6, a cubic crystal structure, poor cleavage, and specific gravity around 2.2–2.4; exact composition cannot be confirmed from the photograph.
Identified More igneous →
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Physical properties
The specimen appears massive, blue-gray with pale veins and a vitreous to dull luster. Sodalite has Mohs hardness 5.5–6, a cubic crystal structure, poor cleavage, and specific gravity around 2.2–2.4; exact composition cannot be confirmed from the photograph.
Formation & geological history
Sodalite typically crystallizes in silica-poor, sodium-rich igneous rocks such as nepheline syenite, during magma cooling. Such rocks form in diverse geological periods and occur in alkaline igneous complexes.
Uses & applications
Sodalite is used as an ornamental and carving stone, in jewelry, and as a collector specimen; large blocks may be used decoratively.
Geological facts
Sodalite is often confused with lapis lazuli, but usually lacks lapis’s abundant pyrite flecks. Its blue color comes from sulfur-bearing centers in the mineral structure.
Field identification & locations
Look for blue color with white calcite or feldspar veins; sodalite is softer than quartz and may fluoresce orange under ultraviolet light. Notable deposits occur in Canada, Brazil, Namibia, and Greenland.
