mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, can be gray, green, or white; Luster: vitreous to greasy; Crystal structure: isometric; Cleavage: poor/indistinct.

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

Identified July 2, 2026More mineral →

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Physical properties

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, can be gray, green, or white; Luster: vitreous to greasy; Crystal structure: isometric; Cleavage: poor/indistinct.

Formation & geological history

Forms in igneous rocks that crystallized from sodium-rich magmas, such as nepheline syenites or phonolites. It is also found in contact metamorphic zones.

Uses & applications

Used primarily as an ornamental stone, for beads in jewelry, cabochons, and decorative carvings. Due to its color, it is often used as a more affordable substitute for lapis lazuli.

Geological facts

Sodalite is a member of the sodalite group and is known for its ability to fluoresce bright orange under ultraviolet light. It lacks the golden pyrite specks found in lapis lazuli.

Field identification & locations

Collectors should look for the characteristic deep blue color with white calcite veining. It is often found in the Bancroft area of Ontario, Canada, and in Namibia.