mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectUsually deep blue with white calcite veining; vitreous to greasy luster and a massive, granular texture. Mohs hardness 5.5–6; cubic mineral, typically without visible cleavage in a tumbled piece. The image is consistent with sodalite, though identification from appearance alone is not definitive.
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Physical properties
Usually deep blue with white calcite veining; vitreous to greasy luster and a massive, granular texture. Mohs hardness 5.5–6; cubic mineral, typically without visible cleavage in a tumbled piece. The image is consistent with sodalite, though identification from appearance alone is not definitive.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenite and related alkaline intrusions. These rocks formed at various geological ages as magma cooled underground.
Uses & applications
Polished sodalite is used in beads, carvings, ornaments, and inexpensive jewelry; it has limited industrial use.
Geological facts
Sodalite’s blue color comes from sulfur-bearing defects in its crystal structure; white veins are commonly calcite.
Field identification & locations
Look for opaque royal-blue material with irregular white calcite veins; common sources include Brazil, Canada, Namibia, and Russia. Similar-looking lapis lazuli may contain golden pyrite flecks.
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