A rare mineral containing copper and iron oxide that forms from the weathering of copper-bearing rocks.
From Greek 'chalkos' (copper) and 'sideros' (iron), plus the mineral suffix '-ite,' literally meaning 'copper-iron stone.' It describes the mineral's composition of these two metals.
Chalcosiderite is a secondary mineral, meaning it forms from the breakdown of other minerals over time—it's like nature's way of recycling copper and iron into new forms.
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