mineral
Sodalite
Sodalite Na8(Al6Si6O24)Cl2
Hardness: 5.5-6 (Mohs scale). Color: Rich royal blue to violet-blue, often with white streaks of calcite. Luster: Vitreous to greasy. Crystal structure: Cubic (Isometric). Specific Gravity: 2.27-2.33.
- Hardness
- 5
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 (Mohs scale). Color: Rich royal blue to violet-blue, often with white streaks of calcite. Luster: Vitreous to greasy. Crystal structure: Cubic (Isometric). Specific Gravity: 2.27-2.33.
Formation & geological history
Forms in sodium-rich igneous rocks such as nepheline syenites and phonolites. It is most commonly found in plutonic environments where silica is undersaturated.
Uses & applications
Used primarily for ornamental purposes, jewelry (beads and cabochons), carvings, and as a collector's mineral. Occasionally used as a decorative building stone.
Geological facts
Sodalite was famously used in the interior decoration of Marlborough House in London after Princess Patricia of Connaught visited the Princess Sodalite Mine in Canada. It is often confused with Lapis Lazuli but can be distinguished by the lack of brassy pyrite flecks.
Field identification & locations
Identify by its deep blue color, white veining, and lack of pyrite. It often fluoresces a bright orange or yellow under UV light. Common locations include Brazil, Canada (Bancroft), Namibia, and Russia.
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