MnAg2SnSe4 is Stannite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. Mn(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form MnSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Ag(1)Se4 tetrahedra. Ag(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form AgSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Ag(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. Sn(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form SnSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra and corners with eight equivalent Ag(1)Se4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra. In the second Se site, Se(2) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra. In the third Se site, Se(3) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra.
MnAg2SnSe4 is Stannite-like structured and crystallizes in the orthorhombic Pmn2_1 space group. Mn(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form MnSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Ag(1)Se4 tetrahedra. The Mn(1)-Se(1) bond length is 2.53 Å. The Mn(1)-Se(3) bond length is 2.51 Å. Both Mn(1)-Se(2) bond lengths are 2.57 Å. Ag(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form AgSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra, corners with four equivalent Ag(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. The Ag(1)-Se(1) bond length is 2.68 Å. The Ag(1)-Se(3) bond length is 2.66 Å. There is one shorter (2.66 Å) and one longer (2.70 Å) Ag(1)-Se(2) bond length. Sn(1) is bonded to one Se(1), one Se(3), and two equivalent Se(2) atoms to form SnSe4 tetrahedra that share corners with four equivalent Mn(1)Se4 tetrahedra and corners with eight equivalent Ag(1)Se4 tetrahedra. The Sn(1)-Se(1) bond length is 2.59 Å. The Sn(1)-Se(3) bond length is 2.60 Å. Both Sn(1)-Se(2) bond lengths are 2.61 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra. In the second Se site, Se(2) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra. In the third Se site, Se(3) is bonded to one Mn(1), two equivalent Ag(1), and one Sn(1) atom to form corner-sharing SeMnAg2Sn tetrahedra.