mineral

Malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, likely with chrysocolla and oxidized copper minerals

AI-generated identification · may be incorrect

Green to blue-green, earthy to dull/vitreous luster, commonly massive rather than crystalline; Mohs hardness 3.5–4, specific gravity about 3.6–4.0. The irregular brown-black areas may be limonite, cuprite, or matrix rock.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms in the oxidized, near-surface zones of copper deposits when copper-bearing fluids react with carbonate-rich groundwater; most examples are Cenozoic to older, depending on the deposit.

Uses & applications

Copper ore, ornamental stone, pigment, and mineral-collection specimen; attractive polished material may be used in carvings and jewelry, though this rough piece appears low-grade.

Geological facts

Malachite commonly occurs with azurite, chrysocolla, limonite, and native copper. Its vivid green color results from copper ions, and powdered or acid-treated material can be hazardous.

Field identification & locations

Identify by its blue-green to emerald-green color, massive botryoidal texture, moderate softness, and possible effervescence in dilute hydrochloric acid; confirm with testing because painted or weathered copper-bearing slag can look similar. Common localities include the Democratic Republic of the Congo, Zambia, Russia, Arizona, and Australia.