mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5-6; Color: Royal blue to greyish-blue; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33
- Hardness
- 5
- Color
- Royal blue to greyish-blue
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6; Color: Royal blue to greyish-blue; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, or in metasomatized calcareous rocks. Brazil (São Paulo and Bahia) is a major global producer.
Uses & applications
Used primarily as a decorative stone, in jewelry (beads and cabochons), carvings, and as an architectural stone for countertops and tiling.
Geological facts
Sodalite is often mistaken for Lapis Lazuli, but it lacks the golden pyrite inclusions found in Lapis. It is a member of the feldspathoid mineral group.
Field identification & locations
Look for its characteristic deep blue color and white veins of calcite. It will often fluoresce a bright orange-red under long-wave UV light. Common in the alkaline massifs of southeastern Brazil.
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