mineral

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white calcite; Luster: Vitreous to greasy; Crystal Structure: Isometric hexoctahedral; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue, mottled with white calcite
Luster: Vitreous to greasy

Identified May 19, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white calcite; Luster: Vitreous to greasy; Crystal Structure: Isometric hexoctahedral; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, such as nepheline syenites or trachytes. Often found as a rock-forming mineral in silica-undersaturated environments.

Uses & applications

Used primarily as a gemstone for jewelry, ornamental carvings, architectural tiles, and as a collector's specimen. It is also used as a dye source and for its unique blue pigment.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains gold-colored pyrite specks and has a white streak rather than a blue one. It is known for its strong orange fluorescence under UV light.

Field identification & locations

Identify in the field by its distinctive blue color, association with alkaline igneous rocks, and white calcite veining. It is commonly found in Brazil, Canada (Princess Sodalite Mine), Greenland, and Namibia.