Linarite

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What Wikipedia says

Linarite is a somewhat rare, crystalline mineral that is known among mineral collectors for its unusually intense, pure blue color. It is formed by the oxidation of galena and chalcopyrite and other copper sulfides. It is a combined copper lead sulfate hydroxide with formula PbCuSO4(OH)2.

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

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