mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: vitreous to greasy; Crystal Structure: cubic; Cleavage: poor; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: typically royal blue, gray, or white
Luster: vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, gray, or white; Luster: vitreous to greasy; Crystal Structure: cubic; Cleavage: poor; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic rocks where limestone has been altered by intrusive magma.

Uses & applications

Used primarily as an ornamental gemstone, for carvings, and in jewelry. Historically used as a blue pigment and occasionally in industrial applications where its low density is beneficial.

Geological facts

Sodalite is often confused with Lapis Lazuli; however, Sodalite rarely contains the gold-colored pyrite specks common in Lapis and has a lower specific gravity. It is known for showing fluorescence under UV light.

Field identification & locations

Identify in the field by its distinct royal blue color and lack of pyrite. Common locations include Bancroft (Ontario, Canada), Namibia, and Brazil. Collectors look for deep color and white calcite veining.