mineral
Sodalite
Na8(Al6Si6O24)Cl2
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue to grayish blue mottled with white veins/patches of calcite, Luster: Vitreous to greasy, Crystal structure: Cubic (Isometric), Cleavage: Poor, Specific Gravity: 2.2-2.3.
- Hardness
- 5
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Physical properties
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue to grayish blue mottled with white veins/patches of calcite, Luster: Vitreous to greasy, Crystal structure: Cubic (Isometric), Cleavage: Poor, Specific Gravity: 2.2-2.3.
Formation & geological history
Forms in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites and phonolites). It is a member of the feldspathoid group. It can also be found in contact metamorphic rocks.
Uses & applications
Primarily used as an ornamental gemstone for cabochons, beads, and carvings. Also used in construction for countertop slabs and architectural tiles, and as a popular specimen for collectors.
Geological facts
Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold flecks of pyrite. It was famously discovered in Greenland in 1811 and became popular in Canada after Princess Margaret of England visited Bancroft and fell in love with it.
Field identification & locations
Identify by its characteristic royal blue color and lack of pyrite flecks. It may fluoresce a bright orange-red under long-wave UV light. Commonly found in Bancroft (Canada), Namibia, Brazil, and Greenland.
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