mineral
Blue tumbled stone, possibly sodalite
Likely sodalite (Na₈(Al₆Si₆O₂₄)Cl₂); identification is uncertain from the image
AI-generated identification · may be incorrectOpaque, rounded and polished, with deep blue color and faint mottling; sodalite has Mohs hardness 5.5–6, vitreous-to-greasy luster, cubic crystal structure, poor cleavage, and specific gravity about 2.2–2.4.
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Physical properties
Opaque, rounded and polished, with deep blue color and faint mottling; sodalite has Mohs hardness 5.5–6, vitreous-to-greasy luster, cubic crystal structure, poor cleavage, and specific gravity about 2.2–2.4.
Formation & geological history
Sodalite forms in silica-poor, alkaline igneous rocks such as nepheline syenite, crystallizing from late-stage magmas. Major deposits occur in Canada, Brazil, Namibia, and Russia; the specimen is likely tumbled and human-processed.
Uses & applications
Used as an ornamental and lapidary stone, in carvings, beads, cabochons, and polished specimens; rarely used industrially.
Geological facts
Blue tumbled stones can also be dyed quartzite, dumortierite, blue calcite, or lapis lazuli, so color alone is insufficient for confirmation.
Field identification & locations
Check for white veining or calcite patches, moderate hardness, and a nonmetallic luster; it should not scratch glass reliably. A streak, hardness, specific-gravity, or chemical test is needed for confident identification.
