Sodalite

Physical Properties

Hardness: 5.5-6.0 Mohs; Color: Royal blue, grey, white; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33

Formation & Geological History

Forms primarily in alkali-rich igneous rocks such as nepheline syenites and phonolites. It can also form during contact metamorphism of calcareous rocks.

Uses & Applications

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

Geological Facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, Sodalite rarely contains golden pyrite inclusions and has a lower specific gravity. It is known for its tendency to fluoresce bright orange under UV light.

Field Identification & Locations

Identify in the field by its characteristic deep blue color mixed with white vein-like streaks of calcite. It is commonly found in Bancroft (Ontario), Brazil, Greenland, and Namibia.

Identified on: 4/24/2026

Mode: Standard