Dozens of new uranium minerals have been described over the past few years, with most of them originating from the Jachymov district in Czech Republic and Red Canyon in Utah. In this presentation I will focus on the recently described minerals and several that are under investigation in my group, with an emphasis on their structures. Most remarkable is ewingite, a uranyl carbonate that is the most complex mineral ever described. Ewingite contains nanoscale uranyl carbonate cages that suggest geochemical models of such systems may be expanded to include the role of macro anions in solution. Another, shinkolobweite, is a lead uranyl oxyhydrate that contains pentavalent uranium and thus demonstrates that this unusual oxidation state can be stabilized under specific geochemical conditions
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