mineral
Tumbled sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor calcite or nepheline
AI-generated identification · may be incorrectDark royal-blue to gray-blue, opaque, with white veining or patches; vitreous to greasy luster and commonly massive rather than visibly crystalline. Mohs hardness 5.5–6, cubic crystal system, poor cleavage, and specific gravity about 2.25–2.33.
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Physical properties
Dark royal-blue to gray-blue, opaque, with white veining or patches; vitreous to greasy luster and commonly massive rather than visibly crystalline. Mohs hardness 5.5–6, cubic crystal system, poor cleavage, and specific gravity about 2.25–2.33.
Formation & geological history
Forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite and related alkaline pegmatites, crystallizing during magma cooling. The specimen is human-tumbled and polished; its exact geological age cannot be determined from the image.
Uses & applications
Used as an ornamental stone, carving material, cabochons, beads, and inexpensive lapidary specimens; sometimes used decoratively in countertops and tiles.
Geological facts
Sodalite is often confused with lapis lazuli, but true sodalite generally lacks abundant metallic-gold pyrite flecks. White areas commonly consist of calcite or other associated minerals.
Field identification & locations
Identify by its saturated blue color, white veining, moderate hardness, and lack of pyrite; a streak, acid, or hardness test can help distinguish it from lapis and dyed stones. Common sources include Canada, Brazil, Greenland, Russia, and Namibia.
