#122
I-42d
Example – Dideuterium oxide – Ice XII, D2O
The structure of a new phase of ice
Lobban, C.; Finney, J.L.; Kuhs, W.F.
Nature (1998) 391, 268-270
CIF
https://www.dropbox.com/s/fd544z194sp27yl/icsd_86858.cif
OD4 tetrahedra (red)
D (partially occupied) (cyan/white)
The Fascination of Crystals and Symmetry 