mineral

Sodalite

Na8(Al6Si6O24)Cl2

Hardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white veins or patches; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue, mottled with white veins or patches
Luster: Vitreous to greasy

Identified July 13, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs); Color: Royal blue, mottled with white veins or patches; Luster: Vitreous to greasy; Crystal structure: Cubic; Cleavage: Poor; Specific gravity: 2.27-2.33.

Formation & geological history

Forms primarily in sodium-rich igneous rocks (nepheline syenites and phonolites) and is also found in contact metamorphic zones. Most commercially available specimens are from the Phanerozoic eon.

Uses & applications

Used primarily as decorative stone for ornaments, jewelry, and beads. Also used in architectural applications like countertops or tiles in its matrix form.

Geological facts

Sodalite is often confused with Lapis Lazuli, but it lacks the brassy pyrite inclusions common in Lapis. It can floresce a bright orange or yellow under long-wave UV light.

Field identification & locations

Look for a rich blue color with white calcite veining. It is relatively lightweight compared to other blue minerals. Most common high-quality sources are Canada (Ontario), Brazil, and Namibia.