metamorphic
Sodalite in Quartz
Na8(Al6Si6O24)Cl2 (Sodalite) / SiO2 (Quartz)
Hardness: 5.5-6 (Sodalite) to 7 (Quartz); Color: White matrix with royal blue or dark blue patches; Luster: Vitreous to greasy; Crystal Structure: Isometric (Sodalite) and Hexagonal (Quartz); Specific Gravity: 2.2-2.7.
- Hardness
- 5
- Color
- White matrix with royal blue or dark blue patches
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 (Sodalite) to 7 (Quartz); Color: White matrix with royal blue or dark blue patches; Luster: Vitreous to greasy; Crystal Structure: Isometric (Sodalite) and Hexagonal (Quartz); Specific Gravity: 2.2-2.7.
Formation & geological history
Formed in silica-poor igneous rocks like nepheline syenites and associated pegmatites, often found in metamorphic environments where metasomatism has occurred. Most commercial blue and white specimens originate from Brazil, Namibia, or Canada.
Uses & applications
Primarily used for lapidary work, including tumbled stones, cabochons for jewelry, decorative carvings, and spiritual/metaphysical collecting.
Geological facts
Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite flecks and typically has white calcite or quartz streaks. It was famously discovered in Greenland in 1811 but became popular after the Princess of Wales visited Canada and chose it for interior decoration.
Field identification & locations
Identify by the distinct deep blue color against a white background and the lack of brassy pyrite. In the field, look for it in alkaline igneous complexes.
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