mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectTypically blue with white calcite veining; vitreous to greasy luster, massive rather than visibly crystalline, Mohs hardness 5.5–6, and poor cleavage. The rounded shape and shine indicate it has been tumbled and polished.
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Physical properties
Typically blue with white calcite veining; vitreous to greasy luster, massive rather than visibly crystalline, Mohs hardness 5.5–6, and poor cleavage. The rounded shape and shine indicate it has been tumbled and polished.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenite and related alkaline intrusions. Geological ages vary by deposit; it crystallizes as magma cools.
Uses & applications
Used as a decorative stone, in carvings and jewelry, and as a collector specimen.
Geological facts
Its vivid blue color can resemble lapis lazuli, but sodalite usually lacks lapis’s golden pyrite flecks.
Field identification & locations
Common sources include Canada, Brazil, Namibia, and Russia. Identify it by blue color with irregular white calcite patches; a photo alone cannot confirm the mineral.
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