mineral

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate

Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony

AI-generated identification · may be incorrect

Small rounded, polished specimens with vitreous to waxy luster and smooth surfaces; apparent blue calcite is Mohs 3, while quartz/chalcedony is Mohs 7. Colors include pale blue, gray, white, and orange-red; exact identification requires hardness, streak, and acid tests.

Identified September 4, 2026More mineral →

Explore Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate in the encyclopedia →

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At a glance

Common name: Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate
Scientific name: Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony
Category: mineral
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Approximately $1-$10 per small tumbled stone; attractive larger or confidently identified specimens may sell for $10-$30.

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

These are likely natural minerals cut and tumbled by human processing, originating from hydrothermal veins, cavities, or sedimentary deposits; their geological ages cannot be determined from the photograph.

Uses & applications

Used as inexpensive collector specimens, décor, meditation stones, and jewelry components; calcite is also important industrially, while quartz is used in glass, abrasives, and electronics.

Geological facts

The blue stone may be calcite, angelite, or dyed material, and the red stone may be carnelian or jasper; photography alone cannot reliably distinguish them.

Field identification & locations

Look for calcite’s softness and fizz with dilute hydrochloric acid, versus quartz’s strong scratch resistance and lack of reaction. Common sources include Brazil, Mexico, Madagascar, India, and the United States.