M. Koskenlinna et J. Valkonen, AMMONIUM URANYL HYDROGENSELENITE SELENITE, Acta crystallographica. Section C, Crystal structure communications, 52, 1996, pp. 1857-1859
Ammonium uranyl(2+) hydrogenselenate(1-) selenate(2-), (NH4)[UO2(HSeO3
)(SeO3)], has a layered structure with only hydrogen bonding provided
by the NH4+ ion and (probably) the protonated O atom of the hydrogense
lenite ion connecting the layers, The U atom is surrounded by a pentag
onal bipyramidal arrangement of O atoms.