mineral
Sodalite
Na8Al6Si6O24Cl2
Hardness of 5.5 to 6 on the Mohs scale, blue to violet color often mottled with white calcite veins, vitreous to greasy luster, isometric crystal system, poor cleavage, specific gravity of 2.1 to 2.3
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Physical properties
Hardness of 5.5 to 6 on the Mohs scale, blue to violet color often mottled with white calcite veins, vitreous to greasy luster, isometric crystal system, poor cleavage, specific gravity of 2.1 to 2.3
Formation & geological history
Forms in silica-poor igneous rocks such as nepheline syenites and plutonic environments, crystallizing from sodium-rich magmas
Uses & applications
Used as an ornamental gemstone, for decorative carvings, and in lapidary work
Geological facts
Sodalite is a rich blue mineral that can fluoresce orange-red under ultraviolet light due to mineral impurities
Field identification & locations
Identified by its distinct royal blue color mixed with white veining; commonly found in Canada, Greenland, India, and the United States
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral