mineral
Sodalite
Na8(Al6Si6O24)Cl2
Hardness: 5.5 - 6 on the Mohs scale. Color: Deep royal blue, denim blue, often with white calcite veining or mottling. Luster: Vitreous to greasy. Crystal structure: Cubic (isometric). Cleavage: Poor in six directions. Specific gravity: 2.14 - 2.40.
- Hardness
- 5
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5 - 6 on the Mohs scale. Color: Deep royal blue, denim blue, often with white calcite veining or mottling. Luster: Vitreous to greasy. Crystal structure: Cubic (isometric). Cleavage: Poor in six directions. Specific gravity: 2.14 - 2.40.
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites, phonolites, and associated pegmatites. It crystallizes during the late stage of magmatic differentiation.
Uses & applications
Popularly used in gemstone jewelry (beaded bracelets, cabochons, pendants), ornamental carvings, lapidary artwork, and as a decorative stone.
Geological facts
Sodalite was first discovered in Greenland in 1811, but became widely popular as an ornamental stone after vast deposits were discovered in Ontario, Canada, during a royal visit in 1891 (often called 'Princess Blue').
Field identification & locations
Identified by its rich blue color and frequent white calcite inclusions. Unlike lapis lazuli, sodalite rarely contains yellow pyrite specks. Found majorly in Canada, Brazil, Namibia, Greenland, and Russia.
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