mineral

Polished blue sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed chalcedony or lapis lazuli

AI-generated identification · may be incorrect

Deep royal-blue, polished vitreous-to-waxy luster with pale veining or inclusions; sodalite hardness is 5.5–6 Mohs, cubic crystal system, and poor cleavage. The photograph alone cannot confirm composition.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Sodalite forms in silica-poor, alkaline igneous rocks such as nepheline syenite, generally in Precambrian to younger alkaline complexes. Major sources include Canada, Brazil, Namibia, and Russia.

Uses & applications

Used as a decorative and lapidary stone for cabochons, carvings, beads, and ornaments; rarely used industrially. Common polished pieces typically have modest collector value.

Geological facts

Sodalite is commonly confused with lapis lazuli, but lapis usually contains visible golden pyrite and is a rock mixture dominated by lazurite. A white streak and lack of pyrite favor sodalite.

Field identification & locations

Identify by intense blue color, white calcite-like veining, moderate hardness, and a white streak; acid testing and microscopy can help distinguish it from dyed materials. Common tumbled-stone value is about $3–$20; larger, vivid specimens may reach $30–$100.