mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

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

Identified May 18, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites or phonolites. It can also occur in contact metamorphic environments. Most high-quality specimens are from ancient Precambrian formations.

Uses & applications

Used primarily in jewelry as beads or cabochons, as an ornamental stone for carvings and sculptures, and occasionally as an interior architectural surface (countertops or tiles).

Geological facts

It is known for its ability to fluoresce bright orange-yellow under UV light. It was first discovered in Greenland in 1811 and became popular as an ornamental stone after a visit by Princess Margaret of Wales to Ontario, Canada.

Field identification & locations

Identify in the field by its intense blue color, white veining, and lack of pyrite inclusions (which distinguishes it from Lapis Lazuli). Found commonly in Canada (Bancroft), Namibia, Brazil, and Greenland.