mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to grey, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to grey, often with white calcite veining
Luster: Vitreous to greasy

Identified May 21, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Royal blue to grey, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed as a primary mineral in silica-poor igneous rocks like nepheline syenites and phonolites. It can also form during hydrothermal processes in pegmatites.

Uses & applications

Primarily used as an ornamental stone for carvings, beads, jewelry, and decorative architectural accents.

Geological facts

Sodalite is a member of the feldspathoid group. It was first discovered in Greenland in 1811 and became popular when a large deposit was found in Ontario during the visit of Princess Margaret of Connaught, earning it the nickname Princess Blue.

Field identification & locations

Identify in the field by its distinct rich blue color and association with white calcite streaks. Unlike Lapis Lazuli, it rarely contains golden pyrite inclusions. Common locations include Canada (Bancroft), Namibia, Brazil, and Greenland.