Sodalite

Physical Properties

Hardness: 5.5-6 on Mohs scale; Color: typically deep royal blue to violet-blue with white calcite veins; Luster: Vitreous to greasy; Crystal structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & Geological History

Forms in silica-poor igneous rocks (nepheline syenites or phonolites) and some contact metamorphic rocks. It crystallizes from alkali-rich magmas.

Uses & Applications

Primarily used as an ornamental gemstone for jewelry, beads, sculptures, and architectural tiles/facades. Also valuable to collectors.

Geological Facts

Sodalite is often nicknamed the 'Poet's Stone' as it is believed to enhance creativity and expression. While frequently confused with Lapis Lazuli, it lacks the golden pyrite inclusions typically found in Lapis.

Field Identification & Locations

Identify in the field by its distinct blue color with white veining. It is commonly found in Bancroft, Ontario (Canada), Bahia (Brazil), and parts of Namibia and Russia. Collectors should look for fluorescent properties under UV light.

Identified on: 4/15/2026

Mode: Standard