mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectMohs hardness 5.5–6, vitreous to greasy luster, isometric crystal system, typically royal to denim blue with white calcite or nepheline veining.
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Physical properties
Mohs hardness 5.5–6, vitreous to greasy luster, isometric crystal system, typically royal to denim blue with white calcite or nepheline veining.
Formation & geological history
Forms primarily in silica-poor, alkaline igneous rocks like nepheline syenites, phonolites, and related metasomatic skarns.
Uses & applications
Commonly used for ornamental carvings, tumbled stones, beads, jewelry cabochons, and architectural decor slabs.
Geological facts
Named for its sodium content, some varieties of sodalite exhibit bright orange/yellow fluorescence under longwave UV light (hackmanite displays tenebrescence).
Field identification & locations
Identified by its rich denim-blue hue mixed with white streaks and lack of brassy pyrite typical of lapis lazuli; major deposits occur in Brazil, Canada, and Namibia.
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