mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs). Color: Royal blue, indigo, mottled with white veins of calcite. Luster: Vitreous to greasy. Crystal System: Isometric. Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue, indigo, mottled with white veins of calcite
Luster: Vitreous to greasy

Identified July 2, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs). Color: Royal blue, indigo, mottled with white veins of calcite. Luster: Vitreous to greasy. Crystal System: Isometric. Specific Gravity: 2.27-2.33.

Formation & geological history

Found in silica-poor igneous rocks such as nepheline syenites and trachytes. Formed in alkaline-rich magmas or through metasomatic processes.

Uses & applications

Used primarily as an ornamental gemstone, for carvings, jewelry beads, and architectural surfaces like countertops. It is also an important industrial mineral in some contexts.

Geological facts

Sodalite is often confused with Lapis Lazuli, but it usually lacks the gold-flecked pyrite inclusions of Lapis and has a lower density. It was famously discovered in Greenland in 1811 and became popular when it was used to decorate Marlborough House in London.

Field identification & locations

Identify by its rich blue color and persistent association with white calcite streaks. Unlike Lapis, it rarely contains metallic flakes. Common locations include Bancroft (Canada), Brazil, Namibia, and Russia.