mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectDeep royal blue with white veining; vitreous to greasy luster and typically massive rather than visibly crystalline. Mohs hardness 5.5–6; cubic crystal system, poor cleavage, specific gravity about 2.2–2.4.
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Physical properties
Deep royal blue with white veining; vitreous to greasy luster and typically massive rather than visibly crystalline. Mohs hardness 5.5–6; cubic crystal system, poor cleavage, specific gravity about 2.2–2.4.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenites and related alkaline intrusions. Such rocks occur across many geological ages; the pictured stone’s exact source and age cannot be determined visually.
Uses & applications
Used as a decorative stone, polished carving material, beads, and inexpensive cabochons; also collected as a mineral specimen.
Geological facts
White calcite veining commonly distinguishes sodalite from similarly blue lapis lazuli, which often contains golden pyrite flecks.
Field identification & locations
Common sources include Canada, Brazil, Namibia, and Russia. Identify it by its blue color, white veining, and lack of pyrite; a polished stone like this typically sells for about $2–$15, depending on size and quality.
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