Plavnoite is a rare complex uranium sulfate mineral with the formula K0.8Mn0.6[(UO2)2O2(SO4)]•3.5H2O. Typically for the secondary uranium mineral, plavnoite contains uranyl groups. It was discovered in the Plavno mine in Jáchymov, Czech Republic.Plášil, J., Škácha, P., Škoda, R., Kampf, A.R., Sejkora, J., Čejka, J., Hloušek, J., Kasatkin, A.V., Pavlíček, R., and Babka, K., 2015. Plavnoite, IMA 2015-059. CNMNC Newsletter No. 27, October 2015, 1229; Mineralogical Magazine 79, 1229–1236 The Jáchymov site is known as a type locality for many rare and unique minerals.
Relation to other minerals Although related to zippeite, plavnoite is chemically unique.
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