Plavnoite

Plavnoite is a very 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.[1][2] The Jáchymov site is known as a type locality for many rare and unique minerals.[3]

Plavnoite
General
CategorySulfate
Formula
(repeating unit)		K0.8Mn0.6[(UO2)2O2(SO4)]•3.5H2O
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 8.63, b = 14.28,
c = 8.86 [Å], β = 104.04° (approximated)
Identification
Other characteristics Radioactive
References[1]

Relation to other minerals

Although related to zippeite,[1] plavnoite is chemically unique.[4]

References
  1. 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
  2. "Plavnoite: Plavnoite mineral information and data". Mindat.org. Retrieved 2016-03-13.
  3. "Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic - Mindat.org". Mindat.org. Retrieved 2016-03-13.
  4. "Plavnoite: Plavnoite mineral information and data". Mindat.org. Retrieved 2016-03-13.
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