mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to lavender blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to lavender blue with white calcite streaks
Luster: Vitreous to greasy

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to lavender blue with white calcite streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites. It crystallizes from sodium-rich hydrothermal solutions or alkaline magmas.

Uses & applications

Used primarily as a decorative gemstone, in jewelry (beads, cabochons), and as ornamental stone for carvings and architecture. It is also a collector's mineral.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite rarely contains the gold pyrite flecks seen in Lapis. It can also fluoresce orange under ultraviolet light.

Field identification & locations

Identified by its deep blue color and characteristic white veins of calcite. Often found in large masses in Ontario, Canada (Princess Sodalite Mine), Brazil, and Namibia.