mineral

Blue sodalite (likely polished/tumbled)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Deep royal-blue, opaque to translucent with whitish patches; vitreous to greasy luster and commonly massive rather than visibly crystalline. Mohs hardness 5.5–6, imperfect cleavage, cubic crystal system, and specific gravity about 2.25–2.35.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite, crystallizing from alkaline magmas. Most specimens formed in Precambrian to younger alkaline complexes.

Uses & applications

Used as a decorative stone, cabochon, bead, carving material, and inexpensive lapidary specimen; rarely used industrially.

Geological facts

Its blue color comes mainly from sulfur-related defects in the crystal structure. It is commonly confused with lapis lazuli, but lapis usually contains abundant golden pyrite flecks.

Field identification & locations

Identify it by the saturated blue color, white calcite-like veining or patches, relatively low hardness, and lack of metallic pyrite sparkle. Common sources include Canada, Brazil, Namibia, Russia, and Afghanistan.