mineral
Malachite-bearing rock
Malachite, Cu₂CO₃(OH)₂, likely with chrysocolla or matrix minerals
AI-generated identification · may be incorrectGreen to dark-green, typically silky, vitreous, or earthy luster; monoclinic crystals, commonly botryoidal or massive; Mohs hardness 3.5–4; specific gravity about 3.6–4.0. The specimen appears rough and massive, with possible blue-green associated minerals.
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Physical properties
Green to dark-green, typically silky, vitreous, or earthy luster; monoclinic crystals, commonly botryoidal or massive; Mohs hardness 3.5–4; specific gravity about 3.6–4.0. The specimen appears rough and massive, with possible blue-green associated minerals.
Formation & geological history
Forms as a secondary copper mineral in the oxidized zones of copper deposits, commonly replacing or coating primary copper sulfides. Most examples are geologically young relative to their host rocks, ranging from Paleozoic to Cenozoic deposits.
Uses & applications
Used as an ornamental stone, pigment, jewelry, and copper ore; polished material is collectible. Avoid grinding or ingesting dust because copper minerals can be toxic.
Geological facts
Malachite often shows concentric banding and commonly occurs with azurite, chrysocolla, and native copper. Hydrochloric acid may cause slight effervescence, but testing can damage the specimen.
Field identification & locations
Identify by vivid green color, relatively low hardness, heavy feel, and association with blue azurite or turquoise-like chrysocolla. Important localities include the Democratic Republic of Congo, Zambia, Russia, Australia, Arizona, and New Mexico.
