MnNiSi crystallizes in the orthorhombic Pnma 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 to six equivalent Mn(1), two equivalent Ni(1), and four equivalent Si(1) atoms to form a mixture of distorted face, corner, and edge-sharing NiMn6Si4Ni2 cuboctahedra. Si(1) is bonded in a 9-coordinate geometry to five equivalent Mn(1) and four equivalent Ni(1) atoms.
MnNiSi crystallizes in the orthorhombic Pnma space group. Mn(1) is bonded in a 11-coordinate geometry to six equivalent Ni(1) and five equivalent Si(1) atoms. There are five shorter (2.74 Å) and one longer (2.79 Å) Mn(1)-Ni(1) bond length. There are a spread of Mn(1)-Si(1) bond distances ranging from 2.48-2.55 Å. Ni(1) is bonded to six equivalent Mn(1), two equivalent Ni(1), and four equivalent Si(1) atoms to form a mixture of distorted face, corner, and edge-sharing NiMn6Si4Ni2 cuboctahedra. Both Ni(1)-Ni(1) bond lengths are 2.57 Å. There are a spread of Ni(1)-Si(1) bond distances ranging from 2.25-2.30 Å. Si(1) is bonded in a 9-coordinate geometry to five equivalent Mn(1) and four equivalent Ni(1) atoms.