mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2
Hardness: 5.5 to 6 on Mohs scale; Color: typically rich royal blue with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27–2.33
- Hardness
- 5
- Color
- typically rich royal blue with white calcite veining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5 to 6 on Mohs scale; Color: typically rich royal blue with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27–2.33
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also form during the metasomatism of limestone. It is a member of the feldspathoid group.
Uses & applications
Used primarily as a decorative gemstone, for carvings, and as a material for countertops or tiles. It is also popular in holistic practices and as a more affordable alternative to Lapis Lazuli.
Geological facts
Sodalite was first discovered in Greenland in 1811 but became famous as 'Princess Blue' after Princess Margaret of England fell in love with it during a visit to Ontario, Canada, in 1901.
Field identification & locations
Identify by its deep blue color and white (not gold) veins; unlike Lapis Lazuli, it lacks pyrite inclusions. It is majorly found in Bancroft, Canada (the Sodalite Capital of the World), Brazil, and Namibia. In the field, look for its orange fluorescence under UV light.
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