Joanneumite, confirmed as a new mineral in 2012, is the first recognized isocyanurate mineral, with the formula Cu(C3N3O3H2)2(NH3)2.Bojar, H.-P., and Walter, F., 2012. Joanneumite, IMA 2012-001. CNMNC Newsletter No. 13, June 2012, 814; Mineralogical Magazine 76, 807-817Mindat, Joanneumite, http://www.mindat.org/min-42755.html 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.Mindat, Ammineite, http://www.mindat.org/min-38895.htmlMindat, Chanabayaite, http://www.mindat.org/min-43945.htmlMindat, Shilovite, http://www.mindat.org/min-46139.html All of these minerals are very rare and were found in a guano deposit in Pabellón de Pica, Chile.Mindat, Pabellón de Pica, http://www.mindat.org/loc-192704.html
See also Copper(II) cyanurate References