In iron tridecazinc, the FeZn13 unit cell contains two Zn-12 icosahedra whi
ch are Fe-centred and two Zn-2 dumb-bells coordinated by eight icosahedra.
Zn-12 icosahedra form chains along the c axis by vertex-sharing, and are fu
rther interlinked through octahedra-sharing and vertex-to-vertex bonds.