CaMnCu3(RuO4)3 crystallizes in the trigonal R-3 space group. Ca(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form CaO12 cuboctahedra that share faces with two equivalent Mn(1)O6 octahedra and faces with six equivalent Ru(1)O6 octahedra. Mn(1) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Ru(1)O6 octahedra and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. Ru(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form RuO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Ru(1)O6 octahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Ru(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Ru(1), and one Cu(1) atom.
CaMnCu3(RuO4)3 crystallizes in the trigonal R-3 space group. Ca(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form CaO12 cuboctahedra that share faces with two equivalent Mn(1)O6 octahedra and faces with six equivalent Ru(1)O6 octahedra. All Ca(1)-O(1) bond lengths are 2.65 Å. All Ca(1)-O(2) bond lengths are 2.64 Å. Mn(1) is bonded to six equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Ru(1)O6 octahedra and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. All Mn(1)-O(1) bond lengths are 2.09 Å. Ru(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form RuO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with four equivalent Ru(1)O6 octahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 43°. Both Ru(1)-O(1) bond lengths are 1.95 Å. All Ru(1)-O(2) bond lengths are 2.02 Å. Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.92 Å. Both Cu(1)-O(2) bond lengths are 1.93 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ca(1), one Mn(1), one Ru(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), two equivalent Ru(1), and one Cu(1) atom.