mineral

Sodalite

Na8(Al6Si6O24)Cl2

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

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

Identified June 20, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in sodium-rich igneous rocks, particularly nepheline syenites and silica-undersaturated pegmatites. It forms through crystallization from alkaline magmas.

Uses & applications

Used primarily as a decorative gemstone, in jewelry (beads, cabochons), and as ornamental carvings. It is also a popular collector's mineral and used in metaphysical practices.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions and has a lower specific gravity. It was first discovered in Greenland in 1811 and became popular after large deposits were found in Ontario, Canada, during a royal visit by Princess Margaret.

Field identification & locations

Identify by its rich blue color with white veining and lack of pyrite. In the field, it is frequently found in British Columbia, Canada; Litchfield, Maine; and Brazil. It will occasionally fluoresce bright orange under UV light.