mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Hardness: 5.5 to 6 on Mohs scale; Color: typically royal blue to violet, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor/indistinct; Specific Gravity: 2.27 to 2.33.

Hardness: 5
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks (nepheline syenites, trachytes, and phonolites) through late-stage hydrothermal processes. It occurs as a primary constituent of these rocks or within pegmatites. It is often associated with the mineral hackmanite.

Uses & applications

Predominantly used as an ornamental gemstone for carvings, beads, and cabochons. It is also used as an architectural stone for countertops and tiles in high-end design, and collected as mineral specimens.

Geological facts

Sodalite was first discovered in Greenland in 1811 but became commercially popular after massive deposits were found in Ontario, Canada, in 1891. It is sometimes called 'Princess Blue' in reference to Princess Margaret's fondness for the Canadian deposits. Some varieties exhibit fluorescence under UV light.

Field identification & locations

Identify in the field by its characteristic deep blue color and association with white calcite streaks. Unlike Lapis Lazuli, it rarely contains gold-colored pyrite inclusions. Common locations include Bancroft (Ontario), Brazil, Namibia, and Russia. It is relatively easy to scratch with a steel file compared to quartz.