Home / Explore / Minerals / Pseudomarkeyite Minerals Pseudomarkeyite pseudomarkeyite Ca8(UO2)4(CO3)12(H2O)18·3H2O Pseudomarkeyite | New Carbon Mineral — via mineralchallenge.net · Source Overview Pseudomarkeyite is a mineral species (hydrous uranyl carbonate mineral). It crystallises in the monoclinic system. Scientific references Pseudomarkeyite — Wikidata. https://www.wikidata.org/wiki/Q61478637 Link