mineral

Polished blue stone, likely sodalite or dyed agate

Most consistent with sodalite (Na₈(Al₆Si₆O₂₄)Cl₂), though the image cannot confirm composition

AI-generated identification · may be incorrect

Dark blue, opaque, glassy-to-waxy polished luster with faint mottling; sodalite has Mohs hardness 5.5–6, imperfect cleavage, cubic structure, and specific gravity about 2.25–2.35. The rounded shape is tumbled or cabochon-polished.

Identified August 25, 2026More mineral →

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At a glance

Common name: Polished blue stone, likely sodalite or dyed agate
Scientific name: Most consistent with sodalite (Na₈(Al₆Si₆O₂₄)Cl₂), though the image cannot confirm composition
Category: mineral
Identified: August 25, 2026
Method: Standard

AI Estimated Value

$3–$20 for a common polished tumbled piece; $20–$75 if confirmed high-quality sodalite or a larger cabochon.

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 during Precambrian to younger magmatic events. Similar blue specimens may instead be dyed chalcedony or glass.

Uses & applications

Used for carvings, cabochons, beads, ornaments, and decorative stone; lower-grade material is inexpensive and primarily collectible.

Geological facts

Sodalite’s intense royal-blue color commonly contains white calcite veining, which is not clearly visible here. Strongly uniform blue color can indicate dyeing or synthetic material.

Field identification & locations

Check for natural white calcite veins, granular texture, and hardness: sodalite should resist scratching by a steel knife but be scratched by quartz. Common sources include Canada, Brazil, Namibia, and Russia.