CuAl(S0.5Se0.5)2 is Stannite-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. Cu(1) is bonded to two equivalent Se(1) and two equivalent S(1) atoms to form CuSe2S2 tetrahedra that share corners with four equivalent Cu(1)Se2S2 tetrahedra and corners with eight equivalent Al(1)Se2S2 tetrahedra. Al(1) is bonded to two equivalent Se(1) and two equivalent S(1) atoms to form AlSe2S2 tetrahedra that share corners with four equivalent Al(1)Se2S2 tetrahedra and corners with eight equivalent Cu(1)Se2S2 tetrahedra. Se(1) is bonded to two equivalent Cu(1) and two equivalent Al(1) atoms to form SeAl2Cu2 tetrahedra that share corners with four equivalent Se(1)Al2Cu2 tetrahedra and corners with eight equivalent S(1)Al2Cu2 tetrahedra. S(1) is bonded to two equivalent Cu(1) and two equivalent Al(1) atoms to form SAl2Cu2 tetrahedra that share corners with four equivalent S(1)Al2Cu2 tetrahedra and corners with eight equivalent Se(1)Al2Cu2 tetrahedra.
CuAl(S0.5Se0.5)2 is Stannite-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. Cu(1) is bonded to two equivalent Se(1) and two equivalent S(1) atoms to form CuSe2S2 tetrahedra that share corners with four equivalent Cu(1)Se2S2 tetrahedra and corners with eight equivalent Al(1)Se2S2 tetrahedra. Both Cu(1)-Se(1) bond lengths are 2.44 Å. Both Cu(1)-S(1) bond lengths are 2.33 Å. Al(1) is bonded to two equivalent Se(1) and two equivalent S(1) atoms to form AlSe2S2 tetrahedra that share corners with four equivalent Al(1)Se2S2 tetrahedra and corners with eight equivalent Cu(1)Se2S2 tetrahedra. Both Al(1)-Se(1) bond lengths are 2.41 Å. Both Al(1)-S(1) bond lengths are 2.30 Å. Se(1) is bonded to two equivalent Cu(1) and two equivalent Al(1) atoms to form SeAl2Cu2 tetrahedra that share corners with four equivalent Se(1)Al2Cu2 tetrahedra and corners with eight equivalent S(1)Al2Cu2 tetrahedra. S(1) is bonded to two equivalent Cu(1) and two equivalent Al(1) atoms to form SAl2Cu2 tetrahedra that share corners with four equivalent S(1)Al2Cu2 tetrahedra and corners with eight equivalent Se(1)Al2Cu2 tetrahedra.