mineral
Copper Ore (Malachite and Limonite bearing rock)
Copper-bearing rock with secondary copper minerals
Hardness varies from 3.5 to 5.5 depending on the exact minerals (malachite/limonite matrix); colors are brownish-red with distinct green copper carbonate staining; luster is earthy to dull; crystal structure is mostly amorphous or microcrystalline in this matrix.
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Physical properties
Hardness varies from 3.5 to 5.5 depending on the exact minerals (malachite/limonite matrix); colors are brownish-red with distinct green copper carbonate staining; luster is earthy to dull; crystal structure is mostly amorphous or microcrystalline in this matrix.
Formation & geological history
Formed in the oxidized zones of copper ore deposits, where copper-rich hydrothermal fluids interact with surrounding host rocks and carbonated water.
Uses & applications
Primary source for copper extraction, and a popular specimen for mineral collectors.
Geological facts
The characteristic green patches are due to copper oxidation, frequently found in the weathering caps (gossan) of ore bodies.
Field identification & locations
Identify by the vibrant green secondary copper stains on a brown, weathered iron-rich rock matrix. Commonly found near historical copper mining regions.
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