mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

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

Identified July 6, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in sodium-rich igneous rocks (syenites, trachytes) and pegmatites. It is often found in massive form rather than distinct crystals.

Uses & applications

Used primarily as decorative stone, for carvings, cabochons in jewelry, and as a collector's specimen. It was once used as a source of blue pigment.

Geological facts

Commonly confused with Lapis Lazuli, but Sodalite lacks the golden pyrite inclusions usually found in Lapis. It was discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada.

Field identification & locations

Identify by its rich royal blue color and characteristic white veins of calcite. Found in Canada (Ontario), Brazil, Namibia, and the USA. Collectors should check for high polish and lack of cracks.