mineral

Tumbled blue-gray stone, likely sodalite or blue aventurine

Probably sodalite (Na₈Al₆Si₆O₂₄Cl₂); exact identification requires testing

AI-generated identification · may be incorrect

Opaque blue-gray with mottled darker and pale areas, vitreous to waxy luster, and a polished/tumbled surface. Sodalite has Mohs hardness 5.5–6, cubic crystal structure, poor cleavage, and specific gravity about 2.2–2.4.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Sodalite forms in silica-poor, alkaline igneous rocks such as nepheline syenite, generally during Precambrian to younger geological events. Blue aventurine or dumortierite-bearing quartz can look similar.

Uses & applications

Used as ornamental stone, beads, cabochons, carvings, and inexpensive jewelry; tumbled pieces are primarily collected or sold as decorative objects.

Geological facts

Sodalite is commonly deep royal blue with white calcite veining, while this specimen’s subdued gray-blue appearance may indicate weathering, dyeing, or another blue mineral.

Field identification & locations

Check for white calcite veins, hardness relative to steel, streak, and density; a gemological or X-ray diffraction test is needed for certainty. Common sources include Canada, Brazil, Namibia, and Russia.