Ni7Ge4 crystallizes in the orthorhombic Imm2 space group. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(2), two equivalent Ni(3), three equivalent Ni(4), one Ge(3), two equivalent Ge(2), and three equivalent Ge(1) atoms. In the second Ni site, Ni(2) is bonded to one Ni(1), one Ni(2), one Ni(3), three equivalent Ni(4), one Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms to form distorted NiNi6Ge6 cuboctahedra that share corners with two equivalent Ni(2)Ni6Ge6 cuboctahedra, corners with three equivalent Ni(3)Ni6Ge5 trigonal bipyramids, edges with four equivalent Ni(2)Ni6Ge6 cuboctahedra, edges with two equivalent Ni(3)Ni6Ge5 trigonal bipyramids, faces with three equivalent Ni(2)Ni6Ge6 cuboctahedra, and  a faceface with one Ni(3)Ni6Ge5 trigonal bipyramid. In the third Ni site, Ni(3) is bonded to two equivalent Ni(2), four equivalent Ni(1), one Ge(2), two equivalent Ge(1), and two equivalent Ge(3) atoms to form distorted NiNi6Ge5 trigonal bipyramids that share corners with six equivalent Ni(2)Ni6Ge6 cuboctahedra, edges with four equivalent Ni(2)Ni6Ge6 cuboctahedra, faces with two equivalent Ni(2)Ni6Ge6 cuboctahedra, and faces with two equivalent Ni(3)Ni6Ge5 trigonal bipyramids. In the fourth Ni site, Ni(4) is bonded in a 11-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), one Ge(2), one Ge(3), and three equivalent Ge(1) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Ni(3), three equivalent Ni(1), three equivalent Ni(2), and three equivalent Ni(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Ni(3), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(1) atoms. In the third Ge site, Ge(3) is bonded in a 10-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), and four equivalent Ni(2) atoms.
Ni7Ge4 crystallizes in the orthorhombic Imm2 space group. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 13-coordinate geometry to one Ni(1), one Ni(2), two equivalent Ni(3), three equivalent Ni(4), one Ge(3), two equivalent Ge(2), and three equivalent Ge(1) atoms. The Ni(1)-Ni(1) bond length is 2.44 Å. The Ni(1)-Ni(2) bond length is 2.54 Å. Both Ni(1)-Ni(3) bond lengths are 2.61 Å. There are two shorter (2.58 Å) and one longer (2.67 Å) Ni(1)-Ni(4) bond length. The Ni(1)-Ge(3) bond length is 2.77 Å. Both Ni(1)-Ge(2) bond lengths are 2.63 Å. There is one shorter (2.57 Å) and two longer (2.65 Å) Ni(1)-Ge(1) bond lengths. In the second Ni site, Ni(2) is bonded to one Ni(1), one Ni(2), one Ni(3), three equivalent Ni(4), one Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms to form distorted NiNi6Ge6 cuboctahedra that share corners with two equivalent Ni(2)Ni6Ge6 cuboctahedra, corners with three equivalent Ni(3)Ni6Ge5 trigonal bipyramids, edges with four equivalent Ni(2)Ni6Ge6 cuboctahedra, edges with two equivalent Ni(3)Ni6Ge5 trigonal bipyramids, faces with three equivalent Ni(2)Ni6Ge6 cuboctahedra, and  a faceface with one Ni(3)Ni6Ge5 trigonal bipyramid. The Ni(2)-Ni(2) bond length is 2.49 Å. The Ni(2)-Ni(3) bond length is 2.62 Å. There is one shorter (2.57 Å) and two longer (2.64 Å) Ni(2)-Ni(4) bond lengths. The Ni(2)-Ge(2) bond length is 2.48 Å. Both Ni(2)-Ge(3) bond lengths are 2.54 Å. There are two shorter (2.59 Å) and one longer (2.62 Å) Ni(2)-Ge(1) bond length. In the third Ni site, Ni(3) is bonded to two equivalent Ni(2), four equivalent Ni(1), one Ge(2), two equivalent Ge(1), and two equivalent Ge(3) atoms to form distorted NiNi6Ge5 trigonal bipyramids that share corners with six equivalent Ni(2)Ni6Ge6 cuboctahedra, edges with four equivalent Ni(2)Ni6Ge6 cuboctahedra, faces with two equivalent Ni(2)Ni6Ge6 cuboctahedra, and faces with two equivalent Ni(3)Ni6Ge5 trigonal bipyramids. The Ni(3)-Ge(2) bond length is 2.38 Å. Both Ni(3)-Ge(1) bond lengths are 2.52 Å. Both Ni(3)-Ge(3) bond lengths are 2.38 Å. In the fourth Ni site, Ni(4) is bonded in a 11-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), one Ge(2), one Ge(3), and three equivalent Ge(1) atoms. The Ni(4)-Ge(2) bond length is 2.46 Å. The Ni(4)-Ge(3) bond length is 2.55 Å. There is one shorter (2.28 Å) and two longer (2.29 Å) Ni(4)-Ge(1) bond lengths. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to one Ni(3), three equivalent Ni(1), three equivalent Ni(2), and three equivalent Ni(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Ni(3), two equivalent Ni(2), two equivalent Ni(4), and four equivalent Ni(1) atoms. In the third Ge site, Ge(3) is bonded in a 10-coordinate geometry to two equivalent Ni(1), two equivalent Ni(3), two equivalent Ni(4), and four equivalent Ni(2) atoms.