mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
AI-generated identification · may be incorrectHardness is 5.5 to 6 on the Mohs scale. Colors range from royal blue to violet, often veined with white calcite. It exhibits a vitreous to greasy luster and has a cubic crystal system.
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Physical properties
Hardness is 5.5 to 6 on the Mohs scale. Colors range from royal blue to violet, often veined with white calcite. It exhibits a vitreous to greasy luster and has a cubic crystal system.
Formation & geological history
Forms in silica-poor igneous rocks like nepheline syenites from sodium-rich magmas. Crystallizes in late-stage pegmatites and metamorphic environments.
Uses & applications
Commonly used as an ornamental gemstone, for carved decorative objects, and occasionally in lapidary work.
Geological facts
Sodalite is often confused with lapis lazuli but typically lacks pyrite inclusions. It fluoresces a bright orange-red under ultraviolet light.
Field identification & locations
Identified by its rich royal blue color combined with white calcite patches and lack of brassy pyrite. Found in Canada, Greenland, India, and the USA.
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