mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

AI-generated identification · may be incorrect

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

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

Identified March 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenite and phonolite, as well as in contact metamorphic rocks. It crystallizes from alkaline magmas and is found in deposits ranging from Precambrian to more recent geological ages.

Uses & applications

Used primarily for ornamental purposes, jewelry (beads, cabochons), carvings, and as a semi-precious gemstone. In industry, it is sometimes used as a pigment in ceramics and glass.

Geological facts

Sodalite is often confused with Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions. It was famously discovered in Greenland in 1811 and became popular after large deposits were found in Ontario, Canada, for interior decoration in royal residences.

Field identification & locations

Identify by its rich blue color and characteristic white calcite streaks. It is typically found in alkaline igneous complexes in locations like Canada (Bancroft), Namibia, Brazil, and Greenland. It lacks the sparkle of pyrite commonly found in Lapis.