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; Cleavage: Poor; Specific Gravity: 2.27-2.33

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

Identified March 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in silica-poor igneous rocks (alkaline rocks) like nepheline syenites or in metasomatized calcareous rocks. Usually found in large masses rather than distinct crystals.

Uses & applications

Primarily used as an ornamental gemstone, for cabochons in jewelry, and for decorative carvings or architectural stone (slabs). Also used as a historical blue pigment.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite lacks the shimmering pyrite inclusions of Lapis and typically has more white calcite veining. It is famously known from 'Princess Sodalite Mine' in Ontario, Canada, named after Princess Margaret visited in 1901.

Field identification & locations

Identify in the field by its distinct deep blue color mixed with white veining. It will react to long-wave UV light, often exhibiting a strong orange fluorescence. Commonly found in Canada (Bancroft), Namibia, and Brazil.