mineral
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
AI-generated identification · may be incorrectHardness: 5.5-6 (Mohs); Color: Royal blue to grey-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33.
- Hardness
- 5
- Color
- Royal blue to grey-blue with white calcite inclusions
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 (Mohs); Color: Royal blue to grey-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33.
Formation & geological history
Forms in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic rocks. Commonly associated with pegmatites.
Uses & applications
Used primarily in jewelry (beads, cabochons), ornamental carvings (spheres, pyramids), and as a landscape/architectural stone.
Geological facts
Named for its high sodium content. It is a main component of the rock Lapis Lazuli, but unlike Lapis, Sodalite rarely contains pyrite flecks and usually features white calcite veining.
Field identification & locations
Identify by its deep blue color and white streaks; it is often fluorescent (orange) under UV light. Found in Canada (Bancroft), Namibia, Brazil, and Greenland.
