mineral
Polished sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectTypically Mohs 5.5–6; rich royal-blue with white calcite veining and occasional dark inclusions. Vitreous to greasy luster; isometric crystal system, though this polished piece shows no crystal faces.
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Physical properties
Typically Mohs 5.5–6; rich royal-blue with white calcite veining and occasional dark inclusions. Vitreous to greasy luster; isometric crystal system, though this polished piece shows no crystal faces.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenite and related rocks. Deposits formed at various geological ages; the image does not establish a specific source or age.
Uses & applications
Polished sodalite is used for cabochons, beads, ornaments, and carvings; the mineral also has limited industrial use.
Geological facts
Often confused with lapis lazuli, but sodalite generally lacks the abundant golden pyrite flecks characteristic of lapis.
Field identification & locations
Blue color with irregular white calcite veins is a useful clue; hardness testing or mineral analysis can confirm identification. Notable sources include Brazil, Canada, Namibia, and Russia.
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