CuAsS crystallizes in the orthorhombic Pnma space group. Cu(1) is bonded to one As(1) and three equivalent S(1) atoms to form CuAsS3 tetrahedra that share  a cornercorner with one S(1)Cu3As tetrahedra and corners with six equivalent Cu(1)AsS3 tetrahedra. As(1) is bonded in a 4-coordinate geometry to one Cu(1), two equivalent As(1), and one S(1) atom. S(1) is bonded to three equivalent Cu(1) and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one Cu(1)AsS3 tetrahedra and corners with six equivalent S(1)Cu3As tetrahedra.
CuAsS crystallizes in the orthorhombic Pnma space group. Cu(1) is bonded to one As(1) and three equivalent S(1) atoms to form CuAsS3 tetrahedra that share  a cornercorner with one S(1)Cu3As tetrahedra and corners with six equivalent Cu(1)AsS3 tetrahedra. The Cu(1)-As(1) bond length is 2.38 Å. There is one shorter (2.28 Å) and two longer (2.29 Å) Cu(1)-S(1) bond lengths. As(1) is bonded in a 4-coordinate geometry to one Cu(1), two equivalent As(1), and one S(1) atom. Both As(1)-As(1) bond lengths are 2.52 Å. The As(1)-S(1) bond length is 2.27 Å. S(1) is bonded to three equivalent Cu(1) and one As(1) atom to form SCu3As tetrahedra that share  a cornercorner with one Cu(1)AsS3 tetrahedra and corners with six equivalent S(1)Cu3As tetrahedra.