The indides Ce 7 Ni 5±x Ge 3±x In 6 and Pr 7 Ni 5±x Ge 3±x In 6 were synthesized from the elements by arc-melting of the components. Single crystals were grown via special annealing sequences. Both structures were solved from X-ray single crystal diffraction data: new structure type, P6/m, Z=1, a=11.385(2), c=4.212(1)Å, wR 2 =0.0640, 634F 2 values, 25 variables for Ce 7 Ni 4.73 Ge 3.27 In 6 and a=11.355(6), c=4.183(2)Å, wR 2 =0.0539, 563F 2 values, 25 variables for Pr 7 Ni 4.96 Ge 3.04 In 6 . Both indides show homogeneity ranges through Ni/Ge mixing (M sites). This new structure type can be derived from the AlB 2 structure type by a substitution of the Al and B atoms by CeM 12 and NiIn 6 Ce 3 polyhedra (tricapped trigonal prism). Magnetic susceptibility measurements on a polycrystalline sample of Ce 7 Ni 5 Ge 3 In 6 indicated Curie–Weiss like paramagnetic behavior down to 1.71K with the effective magnetic moment slightly reduced in relation to the value expected for trivalent cerium ions. No magnetic ordering is evident.