mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish-blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Cubic (isometric), Cleavage: Poor/Indistinct, Specific Gravity: 2.27-2.33
- Hardness
- 5
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Physical properties
Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish-blue with white calcite inclusions, Luster: Vitreous to greasy, Crystal structure: Cubic (isometric), Cleavage: Poor/Indistinct, Specific Gravity: 2.27-2.33
Formation & geological history
Found primarily in silica-poor igneous rocks like nepheline syenites and phonolites. It forms in low-silica environments where alkali-rich magma crystallizes. Often associated with pegmatites.
Uses & applications
Used as an ornamental gemstone, in jewelry (beads, cabochons), carvings, and architecture (stone slabs and tiles). Highly valued by mineral collectors for its deep blue color.
Geological facts
Sodalite was first discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada in 1891 during a royal visit, earning it the nickname 'Princess Blue'. It is often confused with Lapis Lazuli but lacks the characteristic gold pyrite flecks.
Field identification & locations
Identify in the field by its intense blue color, white calcite veining, and lack of pyrite. It is found in significant deposits in Canada, Brazil, Namibia, and Russia. It will often fluoresce orange under ultraviolet light.
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