mineral

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to violet-blue with white streaks
Luster: Vitreous to greasy

Identified April 4, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white streaks; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites and trachytes) and sometimes in contact metamorphic rocks. It crystallizes from alkali-rich magmas.

Uses & applications

Used primarily as an ornamental gemstone, for carvings, jewelry (beads and cabochons), and as a decorative architectural stone.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite inclusions. It is known as the 'Poet's Stone' or 'Blue Stone' in some cultures.

Field identification & locations

Identify in the field by its intense blue color and characteristic white veins or patches of calcite. It has a white streak when tested on a porcelain plate. Common locations include Bancroft (Canada), Namibia, and Brazil.