Studtite : [(UO2)(O2)(H2O)2].2H2O

Source: Science (2012)
Why?
Studtite, or uranyl peroxyde, is a well-known compound in the nuclear fuel cycle used for decades. It's also a mineral, to date the only one involving uranium and peroxide. It's structure was only elucidate in 2003!—Blanchard Florent
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