mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6.0 on Mohs scale; Color: typically royal blue, can contain white calcite veins; Luster: vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: typically royal blue, can contain white calcite veins
Luster: vitreous to greasy

Identified May 19, 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 some contact metamorphic rocks. It crystallizes from sodium-rich magmas.

Uses & applications

Used primarily as a gemstone in jewelry (cabochons, beads), decorative carvings, and as a dimension stone for architectural accents and countertops.

Geological facts

Sodalite was named for its high sodium content. It was famously discovered in Greenland in 1811 but became popular after large deposits were found in Ontario, Canada, during a royal visit by Princess Margaret in 1901, leading to its nickname 'Princess Blue'.

Field identification & locations

Identify in the field by its distinct royal blue color and characteristic white calcite veining. Unlike lapis lazuli, it rarely contains golden pyrite flecks and is less dense. Found in Canada (Bancroft), Brazil, Namibia, and Russia.