mineral

Tumbled blue-gray stone, likely sodalite or dumortierite quartz

Most plausibly sodalite (Na₈Al₆Si₆O₂₄Cl₂); identification is uncertain from the image

AI-generated identification · may be incorrect

Opaque blue-gray, lightly mottled, with a matte-to-waxy polished luster and no visible crystals or cleavage. Sodalite has Mohs hardness 5.5–6 and specific gravity about 2.2–2.4; dumortierite quartz is harder, about 7.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled blue-gray stone, likely sodalite or dumortierite quartz
Scientific name: Most plausibly sodalite (Na₈Al₆Si₆O₂₄Cl₂); identification is uncertain from the image
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Approximately $2–$10 for a small common tumbled piece; $10–$30 if unusually vivid, large, or actually dumortierite quartz.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Sodalite forms in silica-poor, sodium-rich igneous rocks such as nepheline syenite, generally in Precambrian to younger alkaline complexes. Tumbled shaping is human processing, not natural geological texture.

Uses & applications

Used as an ornamental stone, beads, cabochons, and inexpensive collectibles; unsuitable for major construction applications.

Geological facts

Blue sodalite is commonly confused with lapis lazuli, but lapis typically contains visible brassy pyrite and white calcite. A hardness or streak test would improve identification.

Field identification & locations

Common sources include Canada, Brazil, Namibia, and Russia. Check for a white streak and resistance to a steel knife; definitive identification requires hardness, streak, and possibly chemical testing.