Joanneumite, confirmed as a new mineral in 2012, is the first recognized isocyanurate mineral, with the formula Cu(C<sub>3</sub>N<sub>3</sub>O<sub>3</sub>H<sub>2</sub>)<sub>2</sub>(NH<sub>3</sub>)<sub>2</sub>. Its crystal structure is identical to the structure of its synthetic analogue bis(isocyanurato)diamminecopper(II). It is an ammine-containing mineral, a feature shared with ammineite, chanabayaite and shilovite. All of these minerals are very rare and were found in a guano deposit in Pabellón de Pica, Chile.