mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

AI-generated identification · may be incorrect

Hardness: 5.5-6.0 Mohs; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, grey, or white
Luster: Vitreous to greasy

Identified July 2, 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: 5.5-6.0 Mohs; Color: Royal blue, grey, or white; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Forms in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also form during hydrothermal metasomatism of lime-rich rocks.

Uses & applications

Used primarily as decorative stone, in jewelry (beads, cabochons), and as a collecting specimen. Historically used as a pigment.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions and has a lower density. It is famous for its occurrences in Bancroft, Ontario, and is sometimes called 'Princess Blue' because it was selected as a decorative stone for Marlborough House in London.

Field identification & locations

Identify by its deep blue color often mottled with white calcite veins. In the field, look for it in alkaline igneous complexes. Unlike Azurite, it will not react with dilute acid.