mineral

Tumbled copper-bearing rock, likely cuprite-rich matrix

Cuprite (Cu₂O) with native copper and iron-oxide matrix; visual identification is provisional

AI-generated identification · may be incorrect

Hardness about 3.5–4 for cuprite, with metallic to earthy reddish-brown luster and copper-red coloration; commonly massive rather than visibly crystalline, with irregular cavities and a heavy feel. The rounded shape indicates natural water wear or tumbling.

Identified September 4, 2026More mineral →

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At a glance

Common name: Tumbled copper-bearing rock, likely cuprite-rich matrix
Scientific name: Cuprite (Cu₂O) with native copper and iron-oxide matrix; visual identification is provisional
Category: mineral
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Typically $5–$30 for a small polished common piece; approximately $50–$300+ for attractive, well-documented cuprite-rich specimens.

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

Likely formed in the oxidized zone of a copper-ore deposit, where native copper and cuprite develop through weathering of sulfide minerals. Such deposits are mostly Phanerozoic, with age varying by locality.

Uses & applications

Collected as a copper-mineral specimen or lapidary piece; cuprite is chiefly an ore of copper, though gem-quality transparent crystals are used occasionally in jewelry. The porous, polished material has modest decorative value.

Geological facts

Cuprite’s name derives from cuprum, Latin for copper; crystals can be deep ruby-red but are often obscured by native copper, limonite, or other alteration products.

Field identification & locations

Look for reddish metallic color, unusually high density, copper-green oxidation stains, and a red-to-brown streak; confirm with hardness, streak, and ideally chemical or X-ray testing. Common localities include Arizona, Namibia, Russia, and Australia.