mineral

Tumbled blue sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

AI-generated identification · may be incorrect

Dark blue, opaque to slightly translucent, with a vitreous-to-waxy polish; hardness 5.5–6 Mohs, cubic crystal system, poor cleavage, and specific gravity about 2.25–2.35. The specimen may also be blue-dyed stone or another blue mineral, since the image lacks diagnostic veining or a visible white calcite matrix.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Sodalite forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite and related alkaline intrusions, generally in Precambrian to younger settings. It is commonly associated with white calcite and feldspathoid minerals.

Uses & applications

Used as a decorative carving and cabochon material, ornamental stone, and inexpensive tumbled gemstone. It has little industrial significance.

Geological facts

Natural sodalite commonly shows white calcite veining and an ultramarine-to-gray-blue color; strong, uniform blue can indicate dye treatment. It is often confused with lapis lazuli, dumortierite, and blue glass.

Field identification & locations

Common sources include Canada, Brazil, Namibia, and Russia; field identification requires hardness testing, streak, and examination for calcite veining. As a small polished tumble, typical value is $2–$10; unusually vivid, natural pieces may reach $15–$30.