mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5-6.0 on Mohs scale; Color: typically royal blue, can contain white calcite veins; Luster: vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: poor; Specific Gravity: 2.27-2.33
- Hardness
- 5
- Color
- typically royal blue, can contain white calcite veins
- Luster
- vitreous to greasy
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Physical properties
Hardness: 5.5-6.0 on Mohs scale; Color: typically royal blue, can contain white calcite veins; Luster: vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: poor; Specific Gravity: 2.27-2.33
Formation & geological history
Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in some contact metamorphic rocks. It crystallizes from sodium-rich magmas.
Uses & applications
Used primarily as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a dimension stone for architectural accents and countertops.
Geological facts
Sodalite was named for its high sodium content. It was famously discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada, during a royal visit by Princess Margaret in 1901, leading to its nickname 'Princess Blue'.
Field identification & locations
Identify in the field by its distinct royal blue color and characteristic white calcite veining. Unlike lapis lazuli, it rarely contains golden pyrite flecks and is less dense. Found in Canada (Bancroft), Brazil, Namibia, and Russia.
