mineral

Blue Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue, often with white calcite veining
Luster: Vitreous to greasy

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, often crystallizing in hydrothermal environments. It belongs to the sodalite group of minerals.

Uses & applications

Used primarily as a decorative gemstone, for carvings, jewelry (cabochons and beads), and occasionally as an ornamental facing stone in architecture.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it lacks pyrite (gold-colored) inclusions and is usually of a lighter blue. It gained fame in the late 1800s as 'Princess Blue' after Princess Margaret of England visited Canada and fell in love with it.

Field identification & locations

Identify by its intense blue color, white streaks, and lack of pyrite. It is found in large deposits in Bancroft (Ontario), Brazil, Namibia, and Greenland. Collectors value it for its deep indigo hues.