mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue mottled with white and grey, Luster: Vitreous to greasy, Crystal Structure: Cubic/Isometric, Fracture: Conchoidal to uneven, Specific Gravity: 2.27-2.33.
- Hardness
- 5
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Physical properties
Hardness: 5.5-6 (Mohs scale), Color: Rich royal blue mottled with white and grey, Luster: Vitreous to greasy, Crystal Structure: Cubic/Isometric, Fracture: Conchoidal to uneven, Specific Gravity: 2.27-2.33.
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites or phonolites, often through hydrothermal replacement of other minerals. It can also occur in contact metamorphic environments.
Uses & applications
Primarily used as an ornamental stone for jewelry (cabochons, beads), decorative carvings, flooring, and as a popular specimen for rock collectors.
Geological facts
Sodalite is often confused with Lapis Lazuli, but it lacks the golden pyrite inclusions typically found in Lapis. It was famously discovered in Greenland in 1811 and became popular after large deposits were found in Ontario, Canada, in 1891.
Field identification & locations
Look for the signature 'denim blue' color with white calcite veining. It is fluorescent under UV light, often glowing bright orange or yellow-orange. Major deposits are in Canada (Bancroft), Namibia, Brazil, and Greenland.
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