mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 (Mohs); Color: Royal blue to gray-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Cubic/Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 2.27-2.33.

Hardness: 5
Color: Royal blue to gray-blue, often with white calcite veining
Luster: Vitreous to greasy

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, as well as in contact metamorphic environments. Most specimens are found in Proterozoic or Paleozoic geological deposits.

Uses & applications

Used primarily as decorative stone, in jewelry (beads, cabochons), as an ornamental pigment in antiquity, and as a popular specimen for mineral collectors.

Geological facts

Sodalite is often confused with Lapis Lazuli, but Sodalite lacking pyrite inclusions is a defining difference. It is known to fluoresce orange under ultraviolet light, a property used by some collectors to verify authenticity.

Field identification & locations

Identify in the field by its distinct rich blue color and white veins; it is softer than Lapis and lacks its gold-colored pyrite specks. Common locations include Bancroft (Ontario, Canada), Namibia, and Brazil.