mineral

Likely gold-bearing sulfide mineral, possibly chalcopyrite

Chalcopyrite (CuFeS₂), tentative identification

AI-generated identification · may be incorrect

Brassy yellow to bronze, metallic luster, irregular granular surface; Mohs hardness 3.5–4, tetragonal crystal system, poor cleavage, specific gravity about 4.1–4.3. The image alone cannot confirm whether the bright material is native gold or another sulfide.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in hydrothermal copper deposits, commonly with pyrite, sphalerite, and quartz during magmatic-hydrothermal activity; age varies widely by deposit. Native gold, if present, may occur as inclusions or coatings.

Uses & applications

Major copper ore and a collector mineral; attractive specimens are displayed, but ordinary pieces have modest value. Gold-bearing material may have assay value.

Geological facts

Chalcopyrite often develops iridescent blue-purple tarnish (“peacock ore”), though this specimen appears naturally brassy rather than strongly iridescent.

Field identification & locations

Check for a green-black streak and brittleness: chalcopyrite powder is dark green-black and the mineral crumbles, while native gold leaves a yellow streak and deforms rather than shattering. Common worldwide, including Chile, Peru, Canada, Australia, and the United States.