mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Hardness: 5.5-6.0; Color: Royal blue to dark blue 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 dark blue with white calcite veining
Luster: Vitreous to greasy

Identified July 4, 2026More mineral →

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Physical properties

Hardness: 5.5-6.0; Color: Royal blue to dark blue with white calcite veining; Luster: Vitreous to greasy; Crystal Structure: Isometric (cubic); Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks like nepheline syenites and phonolites, as well as in contact metamorphic environments using sodium-rich fluids. Often found in alkaline plutonic rocks.

Uses & applications

Used primarily as a gemstone for jewelry, decorative carvings, beads, and architectural stone (as countertop or tiles). Historically used as a blue pigment.

Geological facts

Named for its high sodium content. It is known to fluoresce orange or yellow under ultraviolet light due to its crystal structure. It is often mistaken for Lapis Lazuli, but Sodalite lacks the fool's gold (pyrite) flecks typical of Lapis.

Field identification & locations

Identify by its rich blue color striping with white calcite and absence of golden pyrite. Commonly found in Bancroft (Ontario, Canada), Namibia, Brazil, and Greenland. It is a key member of the sodalite mineral group.