#141
I41/amd
Example – CeSiO4
The crystal structures of CeSiO4 and Ca2Ce8(SiO4)6O2
Skakle, J.M.S., Dickson, C.L., Glasser, F.P
Powder Diffraction (2000) 15, 234-238
CIF
https://www.dropbox.com/s/h2ybb008bvbhajo/icsd_92040.cif
CeO8 polyhedra (lime)
SiO4 tetrahedra (orange)
The Fascination of Crystals and Symmetry 