mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Mohs hardness: 5.5-6.0; Color: Royal blue to grey-blue with white streaks; Luster: Vitreous to greasy; Crystal system: Isometric; Cleavage: Poor; Specific gravity: 2.27-2.33.
- Hardness
- 5
- Color
- Royal blue to grey-blue with white streaks
- Luster
- Vitreous to greasy
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Physical properties
Mohs hardness: 5.5-6.0; Color: Royal blue to grey-blue with white streaks; Luster: Vitreous to greasy; Crystal system: Isometric; Cleavage: Poor; Specific gravity: 2.27-2.33.
Formation & geological history
Found in igneous rocks that crystallized from sodium-rich magmas, particularly nepheline syenites and phonolites. It typically forms in alkaline intrusive environments.
Uses & applications
Commonly used as a gemstone for beads, cabochons, and decorative carvings; also used in industrial pigments and for metaphysical purposes.
Geological facts
Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada, during a royal visit. It is often confused with Lapis Lazuli but lacks the golden pyrite inclusions.
Field identification & locations
Identified by its rich blue color and frequent white calcite veining. It often fluoresces a bright orange-red under long-wave UV light. Common locations include Canada (Princess Sodalite Mine), Brazil, and Namibia.
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Epidote
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