Sodalite

Physical Properties

Hardness: 5.5 to 6 on Mohs scale. Color: Royal blue typically with white calcite veining. Luster: Vitreous to greasy. Crystal structure: Isometric (cubic). Specific Gravity: 2.27 to 2.33.

Formation & Geological History

Forms in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites). Often found in hydrothermal environments. Common in alkaline igneous complexes.

Uses & Applications

Primarily used for jewelry cabochons, ornamental carvings, beads, and as an architectural decorative stone.

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but it lacks the golden pyrite inclusions common in Lapis. It is known for its ability to fluoresce bright orange or yellow under UV light.

Field Identification & Locations

Identify by its rich blue color and characteristic white streaks of calcite. Look for its greasy luster and lack of metallic inclusions. Commonly found in Bancroft (Ontario), Brazil, and Namibia.

Identified on: 4/30/2026

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