mineral
Blue tumbled stone, possibly sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂ (tentative identification)
AI-generated identification · may be incorrectPolished, opaque dark-blue pebble with a glossy luster; hardness about 5.5–6 on Mohs scale and cubic crystal structure. The image does not show enough detail for a confident identification; dyed stone is also possible.
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Physical properties
Polished, opaque dark-blue pebble with a glossy luster; hardness about 5.5–6 on Mohs scale and cubic crystal structure. The image does not show enough detail for a confident identification; dyed stone is also possible.
Formation & geological history
If sodalite, it formed in silica-poor igneous rocks such as nepheline syenite. Such rocks occur in several geological ages and settings; the stone has been shaped and polished by people.
Uses & applications
Tumbled sodalite is used in jewelry, carvings, and collectible displays.
Geological facts
Sodalite is often blue with white veining, though this specimen appears uniformly dark in the photograph.
Field identification & locations
Check for white calcite veins and a blue streak; hardness or composition testing can distinguish sodalite from dyed materials. Sodalite is found in Canada, Brazil, Namibia, and elsewhere.
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