mineral

Sodalite

Sodalite - Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Hardness: 5.5 - 6 on Mohs scale; Color: Deep royal blue, often with white streaks of calcite; Luster: Vitreous to greasy; Crystal Structure: Isometric hexoctahedral; Cleavage: Poor; Specific gravity: 2.27 to 2.33.

Hardness: 5
Color: Deep royal blue, often with white streaks of calcite
Luster: Vitreous to greasy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, such as nepheline syenites or phonolites. It typically occurs as massive fillings in hydrothermal veins. It is most commonly associated with alkalic igneous environments.

Uses & applications

Predominantly used as a gemstone for jewelry, ornamental carvings, and decorative architectural stonework. It is also a minor source of sodium in some industrial applications.

Geological facts

First discovered in 1811 in Greenland, it became popular as an ornamental stone in 1891 when vast deposits were found in Ontario, Canada, during a royal visit by Princess Margaret. It is often confused with Lapis Lazuli but lacks the characteristic gold pyrite flecks.

Field identification & locations

Identify in the field by its distinct rich blue color and white veins; unlike Lapis Lazuli, it has a white streak when rubbed on a porcelain plate and fluoresces bright orange under long-wave UV light. Common locations include Bancroft (Ontario), Greenland, Brazil, and Namibia.

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