mineral

Malachite-bearing copper ore

Malachite (Cu₂CO₃(OH)₂), likely mixed with chrysocolla, copper oxides, and host rock

AI-generated identification · may be incorrect

Green to blue-green, earthy to dull/vitreous luster, typically massive rather than visibly crystalline; malachite hardness is 3.5–4 Mohs, specific gravity about 3.6–4.0, with perfect cleavage. The specimen appears rough and matrix-rich, so color alone is not definitive.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary copper mineral in the oxidized zones of copper deposits when copper-bearing fluids react with carbonate-rich rock; commonly Cenozoic to older, depending on the ore body.

Uses & applications

Used as an ornamental stone, pigment, teaching specimen, and minor gemstone material; copper ores containing malachite are economically important sources of copper.

Geological facts

Malachite often occurs with azurite, chrysocolla, cuprite, and native copper, and may show concentric banding when polished.

Field identification & locations

Identify by vivid green color, streak (pale green), relatively low hardness, and reaction to dilute hydrochloric acid; avoid acids and dust, and do not ingest or use for aquariums. Common localities include the Democratic Republic of Congo, Zambia, Russia, Australia, Arizona, and New Mexico.