nováčekite
/nəʊˈvɑːtʃɛkʌɪt/(also novacekite) Mineralogy
noun
A hydrated tetragonal oxide and arsenate of magnesium and uranium, Mg(UO2)2(AsO4)2.12H2O, which is a member of the autunite group and occurs as yellow crystals.
Origin
1950s. From the name of Radim Nováček, Czech mineralogist + -ite.