Sodalite

Physical Properties

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue, though often contains white calcite veins; Luster: Vitreous to greasy; Crystal Structure: Isometric/Cubic; Cleavage: Poor; Specific Gravity: 2.27 to 2.33.

Formation & Geological History

Formed in igneous rocks that crystallized from sodium-rich magmas. It is a tectosilicate mineral member of the feldspathoid group. Most commonly found in nephiline syenites, trachytes, and phonolites.

Uses & Applications

Primarily used as an ornamental gemstone, for carvings, and as beads for jewelry. It is also a popular specimen for mineral collectors and sometimes used in architectural surfaces.

Geological Facts

Sodalite was first discovered in Greenland in 1811 and became popular as an ornamental stone in 1891 when large deposits were found in Ontario, Canada. It is often confused with Lapis Lazuli, but unlike Lapis, Sodalite rarely contains pyrite flecks and is less expensive.

Field Identification & Locations

Identify in the field by its distinct deep blue color and the common presence of white calcite streaks. Unlike Lapis Lazuli, it will not have golden pyrite inclusions. It can be found in Canada (Ontario), Brazil, Namibia, and the USA.

Identified on: 4/23/2026

Mode: Standard