mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish blue with white veins, Luster: Vitreous to greasy, Crystal Structure: Cubic/Isometric, Cleavage: Poor, Specific Gravity: 2.27-2.33

Hardness: 5

Identified May 31, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs), Color: Royal blue to greyish blue with white veins, Luster: Vitreous to greasy, Crystal Structure: Cubic/Isometric, Cleavage: Poor, Specific Gravity: 2.27-2.33

Formation & geological history

Forms in sodium-rich igneous rocks such as nepheline syenites and trachytes; also found in contact metamorphism conditions involving limestone. It crystallizes from alkali-rich melts that are low in silica.

Uses & applications

Commonly used for ornamental carvings, beads, jewelry, and as a decorative architectural stone for countertops or tiles; occasionally used as a source of industrial pigment.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite lacks the golden pyrite flecks common in Lapis. It is famously found in Ontario, Canada, where it's known as 'Princess Blue' after Princess Margaret visited the Bancroft mines.

Field identification & locations

Identify by its deep blue color and characteristic white calcite veins. Unlike similar blue minerals, sodalite often fluoresces a bright orange color under long-wave UV light. Common locations include Brazil, Namibia, Canada (Ontario), and Russia.