mineral
Possible sodalite-bearing rock
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely in a feldspathic matrix
AI-generated identification · may be incorrectThe specimen appears dark blue with a pale gray-white fractured surface and massive, nonmetallic to vitreous luster. Sodalite has Mohs hardness 5.5–6, cubic crystal structure, indistinct cleavage, and specific gravity about 2.2–2.4; exact identification requires testing because lighting and scale are limited.
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Physical properties
The specimen appears dark blue with a pale gray-white fractured surface and massive, nonmetallic to vitreous luster. Sodalite has Mohs hardness 5.5–6, cubic crystal structure, indistinct cleavage, and specific gravity about 2.2–2.4; exact identification requires testing because lighting and scale are limited.
Formation & geological history
Sodalite forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite, crystallizing from alkaline magmas. Such rocks commonly formed in Precambrian to younger alkaline complexes.
Uses & applications
Used as an ornamental stone, cabochon material, beads, carvings, and decorative aggregate; large uniform blue pieces are collectible.
Geological facts
Blue sodalite is commonly intergrown with white calcite or feldspar, producing attractive veining. The image could also represent blue lazurite-bearing lapis lazuli or another dyed/processed material.
Field identification & locations
Check for white calcite veining, a blue streak or powder, and hardness: sodalite scratches calcite but not quartz. Common sources include Canada, Brazil, Greenland, Russia, and Afghanistan; laboratory analysis is needed for certainty.
