mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0; Color: Royal blue to gray-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal structure: Isometric (cubic); Specific gravity: 2.27-2.33.

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

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0; Color: Royal blue to gray-blue, often with white calcite veining; Luster: Vitreous to greasy; Crystal structure: Isometric (cubic); Specific gravity: 2.27-2.33.

Formation & geological history

Primarily forms in alkali-rich igneous rocks such as nepheline syenites and phonolites. It can also occur in contact metamorphic rocks where limestone has been altered.

Uses & applications

Ornamental stone, used in jewelry (beads, cabochons), carvings, decorative tiles, and architectural accents.

Geological facts

Sodalite is often mistaken for Lapis Lazuli, but unlike Lapis, it rarely contains golden pyrite inclusions. It is famously found in Ontario, Canada, earning it the nickname 'Princess Blue' after Princess Margaret visited the mines.

Field identification & locations

Identified by its rich blue color and frequent presence of white calcite streaks. It is strongly fluorescent (usually orange) under long-wave ultraviolet light. Found in Canada, Brazil, Namibia, and the USA.