mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; likely with white calcite inclusions
AI-generated identification · may be incorrectOpaque blue-and-white mottled specimen with a vitreous to slightly greasy luster; sodalite is Mohs 5.5–6, cubic, and has poor cleavage. The image alone cannot confirm the identification; similar blue rocks include lapis lazuli and dumortierite-bearing quartzite.
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Physical properties
Opaque blue-and-white mottled specimen with a vitreous to slightly greasy luster; sodalite is Mohs 5.5–6, cubic, and has poor cleavage. The image alone cannot confirm the identification; similar blue rocks include lapis lazuli and dumortierite-bearing quartzite.
Formation & geological history
Sodalite forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenite, and associated metamorphic settings. Such rocks span a wide geological age range.
Uses & applications
Used as a decorative and carving stone, in jewelry, and as a mineral-collection specimen; it is not generally used as a major construction material.
Geological facts
Sodalite is often confused with lapis lazuli, but typically lacks lapis’s golden pyrite flecks.
Field identification & locations
Common sources include Canada, Brazil, Namibia, and Russia. Blue color with irregular white veining is suggestive; a reliable identification may require testing or examination of the unpolished material.
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