InAl(AgSe2)2 is Stannite-like structured and crystallizes in the tetragonal I-4 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to four equivalent Se(1) atoms to form AgSe4 tetrahedra that share corners with four equivalent Ag(2)Se4 tetrahedra, corners with four equivalent In(1)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. In the second Ag site, Ag(2) is bonded to four equivalent Se(1) atoms to form AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent In(1)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. In(1) is bonded to four equivalent Se(1) atoms to form InSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. Al(1) is bonded to four equivalent Se(1) atoms to form AlSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and corners with four equivalent In(1)Se4 tetrahedra. Se(1) is bonded to one Ag(1), one Ag(2), one In(1), and one Al(1) atom to form corner-sharing SeAlInAg2 tetrahedra.
InAl(AgSe2)2 is Stannite-like structured and crystallizes in the tetragonal I-4 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to four equivalent Se(1) atoms to form AgSe4 tetrahedra that share corners with four equivalent Ag(2)Se4 tetrahedra, corners with four equivalent In(1)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. All Ag(1)-Se(1) bond lengths are 2.69 Å. In the second Ag site, Ag(2) is bonded to four equivalent Se(1) atoms to form AgSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent In(1)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. All Ag(2)-Se(1) bond lengths are 2.67 Å. In(1) is bonded to four equivalent Se(1) atoms to form InSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and corners with four equivalent Al(1)Se4 tetrahedra. All In(1)-Se(1) bond lengths are 2.64 Å. Al(1) is bonded to four equivalent Se(1) atoms to form AlSe4 tetrahedra that share corners with four equivalent Ag(1)Se4 tetrahedra, corners with four equivalent Ag(2)Se4 tetrahedra, and corners with four equivalent In(1)Se4 tetrahedra. All Al(1)-Se(1) bond lengths are 2.43 Å. Se(1) is bonded to one Ag(1), one Ag(2), one In(1), and one Al(1) atom to form corner-sharing SeAlInAg2 tetrahedra.