MnNiSi crystallizes in the hexagonal P6_3/mmc space group. Mn(1) is bonded in a 11-coordinate geometry to six equivalent Ni(1) and five equivalent Si(1) atoms. Ni(1) is bonded in a 14-coordinate geometry to six equivalent Mn(1), two equivalent Ni(1), and six equivalent Si(1) atoms. Si(1) is bonded to five equivalent Mn(1) and six equivalent Ni(1) atoms to form a mixture of distorted face and corner-sharing SiMn5Ni6 trigonal bipyramids.
MnNiSi crystallizes in the hexagonal P6_3/mmc space group. Mn(1) is bonded in a 11-coordinate geometry to six equivalent Ni(1) and five equivalent Si(1) atoms. All Mn(1)-Ni(1) bond lengths are 2.64 Å. There are three shorter (2.34 Å) and two longer (2.42 Å) Mn(1)-Si(1) bond lengths. Ni(1) is bonded in a 14-coordinate geometry to six equivalent Mn(1), two equivalent Ni(1), and six equivalent Si(1) atoms. Both Ni(1)-Ni(1) bond lengths are 2.42 Å. All Ni(1)-Si(1) bond lengths are 2.64 Å. Si(1) is bonded to five equivalent Mn(1) and six equivalent Ni(1) atoms to form a mixture of distorted face and corner-sharing SiMn5Ni6 trigonal bipyramids.