Cu2S crystallizes in the monoclinic C2/m space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent S(1) atoms. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent S(1) atoms. In the third Cu site, Cu(3) is bonded in a linear geometry to two equivalent S(1) atoms. S(1) is bonded to one Cu(1), one Cu(3), and two equivalent Cu(2) atoms to form distorted corner-sharing SCu4 trigonal pyramids.
Cu2S crystallizes in the monoclinic C2/m space group. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to two equivalent S(1) atoms. Both Cu(1)-S(1) bond lengths are 2.21 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent S(1) atoms. Both Cu(2)-S(1) bond lengths are 2.15 Å. In the third Cu site, Cu(3) is bonded in a linear geometry to two equivalent S(1) atoms. Both Cu(3)-S(1) bond lengths are 2.15 Å. S(1) is bonded to one Cu(1), one Cu(3), and two equivalent Cu(2) atoms to form distorted corner-sharing SCu4 trigonal pyramids.