mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 Mohs; Color: Deep royal blue with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Cubic; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Deep royal blue with white calcite veining
Luster: Vitreous to greasy

Identified July 20, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 Mohs; Color: Deep royal blue with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Cubic; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic zones where magma reacts with carbonate rocks.

Uses & applications

Commonly used as a gemstone for jewelry, carvings, and ornamental objects. It is also used as an architectural material for countertops and tiles.

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the golden pyrite inclusions common in Lapis. It was discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada in 1891.

Field identification & locations

Identified by its distinctive royal blue color and characteristic white streaks of calcite. It is found in significant quantities in Brazil, Canada (Bancroft), Namibia, and Russia. Collectors value deep blue specimens with high saturation.