Chalcophyllite

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What Wikipedia says

Chalcophyllite is a rare secondary copper arsenate mineral occurring in the oxidized zones of some arsenic-bearing copper deposits. It was first described from material collected in Germany.

Excerpt from the Wikipedia article “Chalcophyllite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Christian Rewitzer, CC BY-SA 3.0, via Wikimedia Commons.