mineral

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, often with white calcite veining; Luster: vitreous to greasy; Crystal structure: isometric/cubic; Cleavage: poor; Specific gravity: 2.27 to 2.33.

Hardness: 5
Color: typically royal blue, often with white calcite veining
Luster: vitreous to greasy

Identified July 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms in sodium-rich igneous rocks (nepheline syenites and phonolites) and some contact metamorphic rocks where silica is absent. Can occur as late-stage hydrothermal deposits.

Uses & applications

Commonly used for ornamental carvings, beads, cabochons for jewelry, and as a decorative architectural stone (countertops/tiles).

Geological facts

Sodalite was first discovered by Europeans in Greenland in 1811, but it did not become popular until a large deposit was found in Ontario, Canada in 1891, which was later used to decorate Marlborough House in London.

Field identification & locations

Identify in the field by its intense blue color, white calcite inclusions, and lack of pyrite flecks (which distinguishes it from Lapis Lazuli). Found in Canada, Brazil, Namibia, and Greenland.