FeSbS crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a 6-coordinate geometry to three equivalent Sb(1) and three equivalent S(1) atoms. Sb(1) is bonded to three equivalent Fe(1) and one S(1) atom to form distorted SbFe3S tetrahedra that share corners with four equivalent Sb(1)Fe3S tetrahedra, corners with nine equivalent S(1)Fe3Sb tetrahedra, and  an edgeedge with one Sb(1)Fe3S tetrahedra. S(1) is bonded to three equivalent Fe(1) and one Sb(1) atom to form distorted SFe3Sb tetrahedra that share corners with four equivalent S(1)Fe3Sb tetrahedra, corners with nine equivalent Sb(1)Fe3S tetrahedra, and  an edgeedge with one S(1)Fe3Sb tetrahedra.
FeSbS crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a 6-coordinate geometry to three equivalent Sb(1) and three equivalent S(1) atoms. There are a spread of Fe(1)-Sb(1) bond distances ranging from 2.54-2.59 Å. There are a spread of Fe(1)-S(1) bond distances ranging from 2.19-2.26 Å. Sb(1) is bonded to three equivalent Fe(1) and one S(1) atom to form distorted SbFe3S tetrahedra that share corners with four equivalent Sb(1)Fe3S tetrahedra, corners with nine equivalent S(1)Fe3Sb tetrahedra, and  an edgeedge with one Sb(1)Fe3S tetrahedra. The Sb(1)-S(1) bond length is 2.59 Å. S(1) is bonded to three equivalent Fe(1) and one Sb(1) atom to form distorted SFe3Sb tetrahedra that share corners with four equivalent S(1)Fe3Sb tetrahedra, corners with nine equivalent Sb(1)Fe3S tetrahedra, and  an edgeedge with one S(1)Fe3Sb tetrahedra.