mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, often with white calcite veining; Luster: vitreous to greasy; Crystal Structure: cubic/isometric; Cleavage: poor/indistinct

Hardness: 5
Color: typically royal blue, often with white calcite veining
Luster: vitreous to greasy

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: typically royal blue, often with white calcite veining; Luster: vitreous to greasy; Crystal Structure: cubic/isometric; Cleavage: poor/indistinct

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It is a member of the feldspathoid group, forming where there is insufficient silica to produce feldspar.

Uses & applications

Primarily used as an ornamental gemstone, for carvings, cabochons, and decorative architectural stone. It is also a popular collector's mineral.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions. It is famously known as 'Princess Blue' because it was discovered in Ontario during a royal visit in the 1900s.

Field identification & locations

Identify by its deep blue color and white streaks. In the field, look for it in alkaline igneous complexes. Some specimens are fluorescent under UV light. Common localities include Bancroft (Canada), Brazil, and Namibia.