Sodalite

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue to lavender-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric; Specific Gravity: 2.27-2.33.

Formation & Geological History

Formed in silica-poor igneous rocks such as nepheline syenites or phonolites, often through hydrothermal crystallization. Most significant deposits are found in alkaline intrusive complexes.

Uses & Applications

Commonly used as a gemstone, for decorative ornaments, in jewelry (beads, cabochons), and as a landscape stone. Occasionally used as a high-end countertop material.

Geological Facts

Sodalite is a member of the sodalite group and is named for its high sodium content. It is known to fluoresce bright orange or yellow under UV light. It was first discovered in Greenland in 1811.

Field Identification & Locations

Identify in the field by its distinct rich blue/lavender color and lack of pyrite inclusions (unlike Lapis Lazuli). Found in Bancroft (Canada), Brazil, Namibia, and Greenland. It has a white streak test.

Identified on: 5/4/2026

Mode: Standard