mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Hardness: 5.5 to 6.0; Color: Royal blue to gray/white mottled; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Cleavage: Poor; Specific gravity: 2.27 to 2.33

Hardness: 5
Color: Royal blue to gray/white mottled
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6.0; Color: Royal blue to gray/white mottled; Luster: Vitreous to greasy; Crystal structure: Cubic (Isometric); Cleavage: Poor; Specific gravity: 2.27 to 2.33

Formation & geological history

Forms in sodium-rich igneous rocks (nepheline syenites and phonolites) where there is a lack of silica to form feldspars. It is a member of the feldspathoid group and can occur in both massive and crystalline forms.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, high-end countertops, and as a collector's mineral specimen.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially famous after a large deposit was found in Ontario, Canada, in 1891 during a royal visit; it is often called 'Princess Blue' in honor of Princess Patricia.

Field identification & locations

Identify in the field by its distinct royal blue color associated with white calcite vining. It can be distinguished from Lapis Lazuli by the lack of gold-colored pyrite specks. Found commonly in Brazil, Canada (Bancroft), Namibia, and Greenland.