mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue to light blue with white inclusions (typically calcite), Luster: Vitreous to greasy, Crystal structure: Isometric, Cleavage: Poor, Specific gravity: 2.27-2.33
- Hardness
- 5
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Physical properties
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue to light blue with white inclusions (typically calcite), Luster: Vitreous to greasy, Crystal structure: Isometric, Cleavage: Poor, Specific gravity: 2.27-2.33
Formation & geological history
Formed in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites and phonolites). It is a member of the sodalite group and is common in alkaline environments.
Uses & applications
Primarily used as a gemstone for jewelry, carvings, and ornamental objects. It is also used as an architectural material for countertops and tiles in luxury construction.
Geological facts
Sodalite is often confused with Lapis Lazuli, but Sodalite lacks the golden pyrite inclusions common in Lapis. It was first discovered in Greenland in 1811 and became popular after large deposits were found in Ontario, Canada, during a visit by the Princess of Wales.
Field identification & locations
Identify by its distinct royal blue color and white veins of calcite. In the field, look for it in alkaline igneous complexes. Collectors value specimens with deep color and minimal gray surface coating.
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