mineral

Weathered copper-bearing rock fragment

Likely malachite-bearing copper ore; identification uncertain from image

AI-generated identification · may be incorrect

Earthy reddish-brown matrix with blue-green surface alteration, dull luster, and irregular fracture; malachite has Mohs hardness 3.5–4, monoclinic crystals, and specific gravity about 3.6–4.0. The specimen may also contain chrysocolla or copper oxides.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed by oxidation and weathering of a copper sulfide deposit near the surface; age depends on its host deposit and cannot be determined visually.

Uses & applications

Copper ores are mined for copper; attractive polished malachite is used for carvings, jewelry, and decorative objects. This small rough fragment has little commercial value.

Geological facts

Blue-green coloration commonly indicates secondary copper minerals such as malachite, chrysocolla, or azurite. Malachite produces a pale green streak and reacts weakly with dilute hydrochloric acid.

Field identification & locations

Common in oxidized copper districts worldwide, including Arizona, Nevada, the Democratic Republic of Congo, Russia, and Australia. Confirm with streak, hardness, acid reaction, and ideally chemical or Raman testing.