mineral

Blue glassy mineral fragment, possibly dyed/cobalt-colored calcite or aragonite

Uncertain from image; vivid blue coloration may indicate treated calcite (CaCO₃), aragonite (CaCO₃), or synthetic glass

AI-generated identification · may be incorrect

Bright cobalt-blue, translucent to opaque, vitreous-to-waxy luster, irregular fracture, and no visible crystal faces or cleavage. Apparent hardness is approximately Mohs 3–4 if calcite/aragonite; glass would be about 5–6.5.

Identified September 1, 2026More mineral →

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At a glance

Common name: Blue glassy mineral fragment, possibly dyed/cobalt-colored calcite or aragonite
Scientific name: Uncertain from image; vivid blue coloration may indicate treated calcite (CaCO₃), aragonite (CaCO₃), or synthetic glass
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small dyed or common fragment; $10–$40 if confirmed as an attractive natural blue calcite/aragonite specimen.

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

If natural calcite or aragonite, it formed from carbonate-rich hydrothermal, cave, or sedimentary environments, generally much younger than the host sediment. The intense uniform blue may result from dye, coating, or laboratory treatment.

Uses & applications

Small pieces are sold as low-cost mineral specimens, craft material, or novelty stones; untreated blue calcite can be decorative, while dyed material has little gem value.

Geological facts

Blue calcite commonly shows cleavage and fizzes in dilute hydrochloric acid; aragonite is commonly fibrous or radiating. Color alone cannot distinguish these from blue glass or resin.

Field identification & locations

Check density, hardness, cleavage, and acid reaction on an inconspicuous area; a jeweler’s loupe may reveal bubbles or dye concentrations indicating glass or treatment. Common sources for blue calcite/aragonite include Mexico, Morocco, and China.