mineral

Sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Typically deep royal-blue with white calcite veining and a vitreous to greasy luster; hardness 5.5–6 Mohs, cubic crystal system, poor cleavage, and specific gravity about 2.27–2.33. The photographed fragment is consistent with blue sodalite containing white calcite or feldspar.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich alkaline igneous rocks such as nepheline syenite and related hydrothermal cavities, generally in younger continental or alkaline complexes. Common sources include Brazil, Canada, Greenland, Namibia, and Russia.

Uses & applications

Used as an ornamental stone, in carvings, cabochons, beads, and inexpensive jewelry; attractive massive material is also used for decorative slabs and objects.

Geological facts

Sodalite is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite and consists largely of lazurite. Its blue color comes from sulfur-related defects in the crystal structure.

Field identification & locations

Identify it by the saturated blue color, white matrix veining, moderate hardness, and lack of metallic pyrite flecks; a streak test is white, though testing may damage the specimen. Commonly collected as rough fragments or polished material.