mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to grey-blue with white veining; Luster: Vitreous to greasy; Crystal Structure: Isometric hexoctahedral; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to grey-blue with white veining
Luster: Vitreous to greasy

Identified May 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms primarily in igneous rocks such as nepheline syenites and phonolites through the crystallization of sodium-rich magmas. It is frequently associated with alkali-rich environments and can also be found in contact metamorphic zones.

Uses & applications

Used extensively as a semi-precious gemstone in jewelry, beads, and cabochons. It is also used in carvings, ornamental objects, and as a decorative architectural finish.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions and has a lower specific gravity. It is known to fluoresce bright orange-yellow under shortwave UV light.

Field identification & locations

Identify in the field by its intense blue color, white calcite inclusions, and lack of pyrite. Notable locations include Bancroft, Ontario (Canada), Bolivia, Brazil, and Namibia. Collectors value it for its deep indigo hues.