mineral

Sodalite

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

Hardness: 5.5-6.0 on Mohs scale; Color: Royal blue to gray-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.3.

Hardness: 5
Color: Royal blue to gray-blue with white calcite inclusions
Luster: Vitreous to greasy

Identified March 28, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0 on Mohs scale; Color: Royal blue to gray-blue with white calcite inclusions; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.2-2.3.

Formation & geological history

Formed primarily in igneous rocks that crystallized from sodium-rich magmas (nepheline syenites and phonolites). It is also found in contact metamorphic rocks. Deposits can vary in age from Proterozoic to Cenozoic.

Uses & applications

Used primarily as an ornamental stone, for carvings, beads, and jewelry. Also used as a decorative architectural stone for countertops or tiles when found in large blocks.

Geological facts

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

Field identification & locations

Identify in the field by its distinct rich blue color and frequent presence of white calcite veins. It is commonly found in Brazil, Namibia, Canada (Bancroft), and Greenland. Collectors look for a deep blue color and fluorescence under UV light (it often glows orange).

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