mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white or gray veining; Luster: Vitreous to greasy; Crystal Structure: Isometric-Hexoctahedral; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to violet-blue with white or gray veining
Luster: Vitreous to greasy

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue to violet-blue with white or gray veining; Luster: Vitreous to greasy; Crystal Structure: Isometric-Hexoctahedral; Specific Gravity: 2.27-2.33.

Formation & geological history

Formed in igneous rocks that crystallized from sodium-rich magmas, such as nepheline syenites and phonolites. It is a member of the feldspathoid group and typically lacks free quartz.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and architectural ornamentation like countertops and tiles.

Geological facts

Sodalite is often confused with Lapis Lazuli; however, Sodalite rarely contains the gold-colored pyrite specks common in Lapis and has a lower specific gravity. Some specimens exhibit fluorescence under UV light.

Field identification & locations

Identify by its rich blue color and characteristic white streaks of calcite. It is commonly found in Bancroft (Ontario, Canada), Namibia, and Brazil. Collectors should look for deep blue saturation and minimal internal fractures.