mineral
Likely sodalite (rough blue specimen)
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
AI-generated identification · may be incorrectDeep blue, opaque, with uneven fracture and a dull to slightly vitreous surface. Sodalite has Mohs hardness 5.5–6 and a cubic crystal structure; the photo alone cannot confirm its identity, and dyed material is also possible.
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Physical properties
Deep blue, opaque, with uneven fracture and a dull to slightly vitreous surface. Sodalite has Mohs hardness 5.5–6 and a cubic crystal structure; the photo alone cannot confirm its identity, and dyed material is also possible.
Formation & geological history
Sodalite forms in silica-poor igneous rocks, especially nepheline syenites, through magmatic crystallization. No age can be determined from the image.
Uses & applications
Used as an ornamental and lapidary stone, in carvings and jewelry; it is not a major industrial mineral.
Geological facts
Lapis lazuli can look similar, but typically contains pyrite flecks and is a rock composed of several minerals.
Field identification & locations
The vivid blue color fits sodalite, but a close-up of a fresh surface or simple hardness and streak tests would help distinguish it from other blue minerals. The reported northwestern Alabama area is dominated by sedimentary rocks, so sodalite would be unusual as a locally formed specimen; it may be brought in or sold as a decorative stone.
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