mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5 to 6; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27 to 2.33
- Hardness
- 5
- Color
- Royal blue, grey, or white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5 to 6; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27 to 2.33
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic rocks such as marbles.
Uses & applications
Used primarily as a gemstone, decorative carvings, and in jewelry. Historically used for architectural ornaments.
Geological facts
Named for its high sodium content. It is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks. Large deposits are found in the 'Princess Sodalite Mine' in Ontario, Canada.
Field identification & locations
Identified by its rich blue color and white veins of calcite. Unlike similar minerals, it will turn pink or yellow under short-wave UV light. Common in Canada, Brazil, and Namibia.
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