Materials Data on H2O by Materials Project
H2O is Cuprite structured and crystallizes in the tetragonal P4_2nm space group. The structure is zero-dimensional and consists of two water molecules. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. O2- is bonded in a water-like geometry to two equivalent H1+ atoms.