mineral

Tumbled blue-gray stone, likely sodalite or dyed quartz

Sodalite (Na₈Al₆Si₆O₂₄Cl₂) is a leading possibility; identification is uncertain from the photograph

AI-generated identification · may be incorrect

Smooth, rounded, polished surface; blue-gray color and vitreous-to-waxy luster. Sodalite has Mohs hardness 5.5–6, cubic crystal structure, poor cleavage, and specific gravity about 2.2–2.4; the specimen’s uniform appearance may also indicate dyed quartz or glass.

Identified September 18, 2026More mineral →

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At a glance

Common name: Tumbled blue-gray stone, likely sodalite or dyed quartz
Scientific name: Sodalite (Na₈Al₆Si₆O₂₄Cl₂) is a leading possibility; identification is uncertain from the photograph
Category: mineral
Identified: September 18, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled stone; $10–$30 if unusually large, attractive, or confirmed natural sodalite.

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

Natural sodalite forms in silica-poor alkaline igneous rocks such as nepheline syenite, generally in Precambrian to younger alkaline complexes. Tumbled specimens are mechanically polished; age cannot be determined visually.

Uses & applications

Used as a decorative and lapidary stone, in cabochons, beads, carvings, and inexpensive specimens. Common tumbled pieces typically have modest value.

Geological facts

Sodalite commonly shows white calcite veining, which is not clearly visible here. A hardness test, streak test, and examination for bubbles or dye concentration would help distinguish it from glass or dyed quartz.

Field identification & locations

Common sources include Canada, Brazil, Namibia, and Russia. Look for natural blue color with white veining; avoid scratching the polished face, and test an inconspicuous area only.