mineral
Malachite in Matrix
Copper Carbonate Hydroxide - Cu2CO3(OH)2
Hardness: 3.5-4 on Mohs scale. Color: Bright green to dark forest green crusts on a dark reddish-brown to grey matrix (often cuprite or iron oxides). Luster: Dull to earthy on rough surfaces, silky to adamantine when fibrous. Crystal structure: Monoclinic.…
- Hardness
- 3
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Physical properties
Hardness: 3.5-4 on Mohs scale. Color: Bright green to dark forest green crusts on a dark reddish-brown to grey matrix (often cuprite or iron oxides). Luster: Dull to earthy on rough surfaces, silky to adamantine when fibrous. Crystal structure: Monoclinic. Cleavage: Perfect in one direction, though rarely seen in rough crusts.
Formation & geological history
Secondary mineral formed in the oxidation zones of copper ore deposits. Hydrothermal fluids rich in copper interact with carbonate-bearing rocks or carbonated groundwater, precipitating malachite in fractures and surfaces of the host matrix rock.
Uses & applications
Ore of copper, popular among mineral collectors, and used as an ornamental stone or lapidary material when thick enough to carve or polish.
Geological facts
Malachite is often associated with other copper minerals like azurite, cuprite, and chrysocolla. It has been used as a green pigment in paint since ancient times, though its powdered form is toxic if inhaled.
Field identification & locations
Identified in the field by its distinct vibrant green color coating dark, heavy copper-bearing matrix rock, reacting with effervescence to dilute hydrochloric acid. Commonly found in copper mining districts such as the Southwestern US (Arizona), Democratic Republic of the Congo, Russia (Ural Mountains), and Australia.
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