mineral

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Hardness: 5.5-6.0 Mohs; Color: Royal blue to mottled grey/white/pink; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Royal blue to mottled grey/white/pink
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to mottled grey/white/pink; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks (alkaline magmas) like nepheline syenites and phonolites, as well as some contact-metasomatic rocks. It often occurs as massive aggregates.

Uses & applications

Commonly used for ornamental carvings, beads, cabochons, and architectural resurfacing. It is popular in the lapidary arts due to its rich color and ability to take a high polish.

Geological facts

Sodalite is often confused with Lapis Lazuli but lacks the golden pyrite specks found in Lapis. It was famously discovered in Greenland in 1811 and became popular in jewelry after a large deposit was found in Ontario during a royal visit by Princess Margaret in 1901.

Field identification & locations

Identify in the field by its distinct royal blue color mottled with white calcite or pinkish inclusions. Unlike Lapis, it often displays a white streak. Common locations include Canada (Bancroft), Brazil, Namibia, and Russia.

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