mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to greyish-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to greyish-blue with white calcite inclusions
Luster: Vitreous to greasy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites and phonolites) through late-stage hydrothermal processes. Significant deposits date from various eras where alkaline magmatism occurred.

Uses & applications

Commonly used as a gemstone for beads and cabochons, ornamental carvings, architectural inlay, and as a popular specimen for mineral collectors due to its vibrant blue color.

Geological facts

Sodalite is often confused with Lapis Lazuli, but sodalite lacks the golden pyrite specks found in Lapis and often features white calcite veining. It is famously known as 'Princess Blue' in Canada after Princess Margaret visited the Bancroft mines.

Field identification & locations

Identify by its intense blue color, white streaks, and lack of pyrite. Many specimens will fluoresce a bright orange or yellow under ultraviolet light. Found in Brazil, Canada (Ontario), Namibia, and Russia (Urals).