mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
AI-generated identification · may be incorrectHardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (dodecahedral); Streak: White.
- Hardness
- 5
- Color
- Royal blue, mottled with white veins
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white veins; Luster: Vitreous to greasy; Crystal structure: Cubic (dodecahedral); Streak: White.
Formation & geological history
Forms in sodium-rich igneous rocks (syenites, trachytes) and pegmatites. It is a member of the feldspathoid group, forming in silica-poor environments.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons, beads), interior decoration (slabs, carvings), and as a collector specimen.
Geological facts
Sodalite was first discovered in Greenland in 1811 and became popular when a large deposit was found in Ontario, Canada, during a royal visit by Princess Margaret.
Field identification & locations
Identify by its rich royal blue color and characteristic white streaks of calcite. Unlike Lapis Lazuli, Sodalite rarely contains gold-colored pyrite specks. Found in Canada, Brazil, and Namibia.
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