mineral
Blue sodalite (likely tumbled)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectTypically deep blue with white veining or patches and a vitreous to greasy luster; Mohs hardness 5.5–6. Crystallizes in the cubic system and has poor cleavage; the small, partly obscured specimen is not definitive enough for certain identification.
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Physical properties
Typically deep blue with white veining or patches and a vitreous to greasy luster; Mohs hardness 5.5–6. Crystallizes in the cubic system and has poor cleavage; the small, partly obscured specimen is not definitive enough for certain identification.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks, especially nepheline syenites and related intrusions. Such deposits occur in diverse geological ages; age cannot be determined from the image.
Uses & applications
Polished sodalite is used for beads, carvings, ornamental objects, and inexpensive jewelry; it is also a collector mineral.
Geological facts
Sodalite is named for its sodium content and can fluoresce orange under ultraviolet light.
Field identification & locations
The opaque blue color with pale veining is characteristic, but lapis lazuli and dyed stones can look similar. Notable sources include Canada, Brazil, Namibia, and Greenland.
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