mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white veining; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to violet-blue with white veining
Luster: Vitreous to greasy

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white veining; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33

Formation & geological history

Forms in sodium-rich igneous rocks (nepheline syenites and phonolites) or as a result of contact metamorphism in calcareous rocks. It crystallizes from silica-deficient magmas.

Uses & applications

Used primarily for lapidary work, jewelry, ornamental carvings, and interior decorative architectural elements like countertops or tiles.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became popular in 1891 when large deposits were found in Ontario, Canada, during a visit by British royalty, leading to its nickname 'Princess Blue'.

Field identification & locations

Identify in the field by its intense blue color, white calcite streaks, and lack of gold-colored pyrite (which distinguishes it from Lapis Lazuli). It also frequently fluoresces bright orange under UV light. Common locations include Brazil, Canada, and Namibia.