mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.3

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

Identified July 12, 2026More mineral →

Explore Sodalite in the encyclopedia →

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); Color: Royal blue to violet-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.3

Formation & geological history

Sodalite is a tectosilicate mineral that forms in sodium-rich igneous rocks, particularly nepheline syenites and related pegmatites. It is typically found in plutonic environments where silica is undersaturated.

Uses & applications

Used primarily as a gemstone, for ornamental carvings, and in interior design (tabletops, tiles). In some smaller industrial cases, it is used for chemical research as a sodalite cage for gas storage.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks and has a lower specific gravity. It is also known as 'Princess Blue' because it was discovered in Ontario, Canada, during a royal visit by Princess Margaret.

Field identification & locations

Field identification focuses on its deep blue color and the common presence of white calcite veins. It will glow bright orange or pink under long-wave ultraviolet light due to fluorescence, which is a key diagnostic feature for collectors.