Mottramite

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What Wikipedia says

Mottramite is an orthorhombic anhydrous vanadate hydroxide mineral, PbCu(VO4)(OH), at the copper end of the descloizite subgroup. It was formerly called cuprodescloizite or psittacinite (this mineral characterized in 1868 by Frederick Augustus Genth).

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

Image: Raymond Disc. - Raimond Spekking, CC BY-SA 3.0, via Wikimedia Commons.