mineral

Tumbled blue sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-gray lapis-lazuli material

AI-generated identification · may be incorrect

Hardness about 5.5–6 Mohs; deep denim-blue to gray-blue with white or dark inclusions, vitreous to dull luster, typically massive rather than visibly crystalline, with poor cleavage. The rounded surface indicates tumbling or natural abrasion.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite and related pegmatites, generally during alkaline magmatic crystallization. Common deposits are Precambrian to younger alkaline complexes.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and inexpensive collector specimens; higher-quality blue sodalite is also used for decorative stone.

Geological facts

Sodalite is one of the principal blue minerals in lapis lazuli, although lapis also contains lazurite, calcite, and pyrite. Strongly blue specimens may fluoresce orange under long-wave ultraviolet light.

Field identification & locations

Identify by its rich blue color, relatively low hardness, and commonly white veining; it is softer than quartz and usually lacks pyrite flecks typical of lapis lazuli. Major sources include Canada, Brazil, Namibia, and Russia.