mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Hardness: 5.5-6 on Mohs scale; Color: Deep royal blue often mixed with white calcite; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Hardness: 5
Color: Deep royal blue often mixed with white calcite
Luster: Vitreous to greasy

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 5.5-6 on Mohs scale; Color: Deep royal blue often mixed with white calcite; Luster: Vitreous to greasy; Crystal Structure: Isometric; Cleavage: Poor; Specific Gravity: 2.27-2.33

Formation & geological history

Formed in silica-poor igneous rocks such as nepheline syenites and phonolites, also found in contact metamorphic rocks. Commonly associated with pegmatite environments.

Uses & applications

Primarily used as a gemstone for jewelry (beads, cabochons), ornamental carvings, and architectural finishing (countertops, tiles). Also used as an affordable substitute for Lapis Lazuli.

Geological facts

Named for its high sodium content. It is known for its ability to fluoresce a bright orange or yellow under long-wave ultraviolet light. It lacks the gold pyrite flecks that distinguish Lapis Lazuli.

Field identification & locations

Identify by its rich blue color and frequent white veining (calcite), plus its lighter weight compared to Lapis. Common in Canada (Ontario), Brazil, Namibia, and Russia. Highly prized by crystal collectors for its aesthetic appeal.