mineral
Copper Ore (Malachite/Chrysocolla bearing)
Cupriferous rock containing secondary copper minerals like Cu2CO3(OH)2
Hardness varies from 3.5 to 4 for secondary minerals like malachite; color is brownish-earthy with characteristic bright green secondary copper stains; luster is dull to earthy; specific gravity ranges around 3.8 to 4.0 depending on exact mineral composition.
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Physical properties
Hardness varies from 3.5 to 4 for secondary minerals like malachite; color is brownish-earthy with characteristic bright green secondary copper stains; luster is dull to earthy; specific gravity ranges around 3.8 to 4.0 depending on exact mineral composition.
Formation & geological history
Formed in the oxidized zones of copper ore deposits, typically through weathering and hydrothermal alteration of primary sulfide minerals.
Uses & applications
Source of copper metal, mineral specimens for collectors, occasionally used for cabochons if dense enough.
Geological facts
Given the geographic coordinates (near Santiago, Chile, a major global copper-producing region), finding copper-bearing mineral specimens in the foothills of the Andes is extremely common and geologically expected.
Field identification & locations
Look for distinctive green or bluish-green stains (malachite/chrysocolla) on brown or gossan-like host rock. Common in porphyry copper deposit regions of central Chile.
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