mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5-6.0; Color: Royal blue to gray-blue, often with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 2.2-2.3.
- Hardness
- 5
- Color
- Royal blue to gray-blue, often with white calcite streaks
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6.0; Color: Royal blue to gray-blue, often with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/indistinct; Specific Gravity: 2.2-2.3.
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic rocks. It crystallizes from magma enriched in sodium and chlorine.
Uses & applications
Mainly used as a gemstone for beads, cabochons, and carvings, or as decorative stone for countertops and tiles. It is also an ornamental mineral for collectors.
Geological facts
Sodalite was first discovered in Greenland in 1806 and became popular in Canada in 1891 when royal blue deposits were found in Ontario. It is often confused with Lapis Lazuli, but Sodalite lacks the golden pyrite inclusions common in Lapis.
Field identification & locations
Identify by its rich blue color accompanied by white veinlets (calcite) and the absence of pyrite flecks. High-quality specimens are found in Bancroft, Canada; Namibia; and Brazil.
