There a number of other more complex, 3D framework structures reported, formed from a mixture of tetrahedral and octahedral cations or other coordination geometries, though connections to the perovskitoid and diamondoid can be often be made (Fig. ). Zn 3 Bi 2 NCS 6 is polymorphic, with both polymorphs assembled from ZnN 4 tetrahedra and BiS 6 octahedra connected by NCS -, with multiple symmetry independent Bi and Zn sites in each structure. The topologies (clw1 and clw2) of these two structures are otherwise unknown in the ToposPro database RbBi(SCN) 4 structure is related to both the perovskite and postperovskite structures, with edge-sharing chains, corner-sharing in the perpendicular directions to form a 3D network. The Rb + cations sit within the pores of this structure. Literature reports make clear that many more 3D ternary thiocyanate frameworks, are feasible.