mineral

Polished sodalite heart

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, commonly intergrown with white calcite

AI-generated identification · may be incorrect

Typically deep royal-blue to gray-blue with white calcite veining or patches; vitreous to greasy luster, granular massive texture, Mohs hardness 5.5–6, poor cleavage, and specific gravity about 2.2–2.4. This specimen is cut and polished into a heart.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks—especially nepheline syenites and related alkaline intrusions—through late magmatic crystallization. Important deposits occur in Canada, Brazil, Namibia, and Russia; ages vary by locality, commonly Precambrian to younger.

Uses & applications

Used as a decorative carving stone, ornamental tile, beads, cabochons, and inexpensive jewelry; its vivid blue color makes it popular with collectors.

Geological facts

Sodalite can resemble lapis lazuli, but genuine sodalite commonly lacks abundant metallic pyrite flecks. It may fluoresce orange under long-wave ultraviolet light.

Field identification & locations

Identify by its blue color, white calcite mottling, moderate hardness, and lack of pyrite; it is generally softer and less dense than lapis lazuli. Common sources include Bancroft, Ontario, and Bahia, Brazil.