MnGa(CuSe2)2 is Stannite-like structured and crystallizes in the tetragonal I-4 space group. Mn(1) is bonded to four equivalent Se(1) atoms to form MnSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. In the second Cu site, Cu(2) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. Ga(1) is bonded to four equivalent Se(1) atoms to form GaSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Cu(2)Se4 tetrahedra. Se(1) is bonded to one Mn(1), one Cu(1), one Cu(2), and one Ga(1) atom to form corner-sharing SeMnGaCu2 tetrahedra.
MnGa(CuSe2)2 is Stannite-like structured and crystallizes in the tetragonal I-4 space group. Mn(1) is bonded to four equivalent Se(1) atoms to form MnSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. All Mn(1)-Se(1) bond lengths are 2.47 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.42 Å. In the second Cu site, Cu(2) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Ga(1)Se4 tetrahedra. All Cu(2)-Se(1) bond lengths are 2.42 Å. Ga(1) is bonded to four equivalent Se(1) atoms to form GaSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Cu(2)Se4 tetrahedra. All Ga(1)-Se(1) bond lengths are 2.46 Å. Se(1) is bonded to one Mn(1), one Cu(1), one Cu(2), and one Ga(1) atom to form corner-sharing SeMnGaCu2 tetrahedra.