Margaritasite
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Margaritasite is a yellow, caesium-bearing mineral in the carnotite group; its chemical formula is (Cs,K,H3O)2(UO2)2V2O8·H2O and its crystal system is monoclinic. It was first described in 1982 from the Margaritas uranium deposit, Pena Blanca district, Chihuahua, Mexico.