mineral
Sodalite
Na8(Al6Si6O24)Cl2
Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: Vitreous to greasy; Crystal structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33
- Hardness
- 5
- Color
- typically royal blue, gray, or white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: Vitreous to greasy; Crystal structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33
Formation & geological history
Formed in sodium-rich igneous rocks, particularly nepheline syenites and related pegmatites. It forms during the late stages of magmatic crystallization.
Uses & applications
Used primarily in jewelry as a gemstone, decorative carvings, and as a popular specimen for mineral collectors. Historically used as a source of blue pigment.
Geological facts
Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden specks of pyrite. Some varieties are highly fluorescent under UV light.
Field identification & locations
Identify by its rich blue color with white streaks of calcite. Found commonly in Brazil, Canada (Princess Sodalite Mine), Namibia, and Russia.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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