mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
Hardness: 5.5-6 (Mohs); Color: Royal blue to greyish violet with white veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (Cubic); Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33
- Hardness
- 5
- Color
- Royal blue to greyish violet with white veins
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 (Mohs); Color: Royal blue to greyish violet with white veins; Luster: Vitreous to greasy; Crystal Structure: Isometric (Cubic); Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33
Formation & geological history
Formed in silica-poor igneous rocks (syenites, trachytes) and pegmatites through crystallization from alkaline magmas. Often found in association with nepheline, cancrinite, and calcite.
Uses & applications
Used primarily as a gemstone for jewelry (beads, cabochons), ornamental carvings, and architectural accents like countertops or tiles. Collectors value it for its deep blue color.
Geological facts
Sodalite is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite inclusions and is usually more translucent. It was famously discovered in Greenland in 1811 but became popular in Canada after a visit by Princess Margaret.
Field identification & locations
Identify by its deep blue color mixed with white calcite streaks and lack of metallic pyrite. It will fluoresce bright orange under short-wave ultraviolet light. Commonly found in Bancroft (Canada), Brazil, Namibia, and Russia.
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