mineral
Blue sodalite-bearing rock, possibly lapis lazuli
Sodalite (Na₈Al₆Si₆O₂₄Cl₂), likely in a feldspathoid-rich aggregate
AI-generated identification · may be incorrectSmall rough blue-gray fragment with a dull to vitreous luster and granular texture; sodalite has Mohs hardness 5.5–6, poor cleavage, and a cubic crystal structure. The image is insufficient to confirm pyrite or calcite, which would support a lapis-lazuli identification.
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Physical properties
Small rough blue-gray fragment with a dull to vitreous luster and granular texture; sodalite has Mohs hardness 5.5–6, poor cleavage, and a cubic crystal structure. The image is insufficient to confirm pyrite or calcite, which would support a lapis-lazuli identification.
Formation & geological history
Forms in silica-poor, sodium-rich igneous environments, especially nepheline syenites and contact-metamorphic zones. Most specimens formed in Precambrian to younger alkaline complexes.
Uses & applications
Used as a blue ornamental stone, pigment, cabochon material, and mineral specimen; lapis-quality material is used in jewelry and carvings. This fragment appears too small and rough for significant commercial use.
Geological facts
Sodalite is commonly vivid royal blue with white calcite veining; lapis lazuli is a rock composed mainly of lazurite, calcite, and pyrite rather than a single mineral.
Field identification & locations
Check for a strong blue streak or powder, white calcite veins, and metallic pyrite flecks; sodalite is generally lighter and lacks abundant pyrite. Common sources include Afghanistan, Canada, Brazil, Russia, and Greenland.
