mineral

Polished copper-bearing rock, likely cuprite-rich copper ore

Cuprite (Cu₂O) with native copper and iron-oxide matrix, probable

AI-generated identification · may be incorrect

Rusty red-brown, earthy to submetallic luster, rounded/tumbled surface with darker pits and inclusions. Cuprite has Mohs hardness 3.5–4, cubic crystals, no prominent cleavage, and high specific gravity (~6.0); exact properties vary with matrix.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms in the oxidized zone of copper deposits when primary copper sulfides weather, commonly alongside native copper, malachite, azurite, and limonite. Such ores are generally geologically young relative to their host deposits, often Cenozoic to Precambrian depending on locality.

Uses & applications

Primarily a collector specimen; copper ores may historically be mined for copper, but this small polished piece has no practical industrial use. Attractive red material can be used decoratively or in mineral displays.

Geological facts

The vivid red color is characteristic of cuprite, though the specimen may also contain reddish iron oxides or jasper. Cuprite can darken or develop green copper-carbonate coatings with prolonged weathering.

Field identification & locations

Commonly found in oxidized copper districts such as Arizona, Namibia, Chile, Russia, and Australia. Confirm with a streak test (cuprite gives reddish-brown streak), unusually high heft, and—where safe—hardness testing; visual identification alone is uncertain.