mineral
Tumbled malachite (likely)
Malachite, Cu₂CO₃(OH)₂
AI-generated identification · may be incorrectPolished deep-green specimen with curved banding and a vitreous-to-silky luster. Malachite has Mohs hardness 3.5–4, monoclinic crystals, perfect cleavage in one direction, and specific gravity about 3.6–4.0.
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Physical properties
Polished deep-green specimen with curved banding and a vitreous-to-silky luster. Malachite has Mohs hardness 3.5–4, monoclinic crystals, perfect cleavage in one direction, and specific gravity about 3.6–4.0.
Formation & geological history
A secondary copper carbonate mineral formed by weathering of copper deposits, commonly in oxidized zones; its geological age varies with the host deposit.
Uses & applications
Used for ornamental carvings, beads, jewelry, and mineral collections; historically also used as a copper ore and pigment.
Geological facts
The distinctive light and dark green bands often form concentric patterns; malachite reacts with acids and should not be used to make dust or handled with food.
Field identification & locations
Look for vivid green color and banded patterns, especially alongside other copper minerals. Common sources include the Democratic Republic of the Congo, Russia, Zambia, and Australia; the polished image alone cannot confirm identity.
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