Karpenkoite , Co 3 ( V 2 O 7 ) ( OH ) 2 · 2 H 2 O , a cobalt analogue of martyite from the Little Eva mine , Grand County , Utah , USA

1 Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia 2 Institute of Physics, Academy of Sciences of the Czech Republic v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic; plasil@fzu.cz 3 Faculty of Geology, Moscow State University, Vorobievy Gory, 119991 Moscow, Russia 4 Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy 5 Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, 193 00 Prague 9, Czech Republic 6 3898 S. Newport Circle, Bountiful, UT 84010, USA * Corresponding author

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