Rb2S is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to five equivalent S(1) atoms. In the second Rb site, Rb(2) is bonded to four equivalent S(1) atoms to form a mixture of corner and edge-sharing RbS4 tetrahedra. S(1) is bonded in a 9-coordinate geometry to four equivalent Rb(2) and five equivalent Rb(1) atoms.
Rb2S is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to five equivalent S(1) atoms. There are a spread of Rb(1)-S(1) bond distances ranging from 3.40-3.85 Å. In the second Rb site, Rb(2) is bonded to four equivalent S(1) atoms to form a mixture of corner and edge-sharing RbS4 tetrahedra. There are a spread of Rb(2)-S(1) bond distances ranging from 3.25-3.33 Å. S(1) is bonded in a 9-coordinate geometry to four equivalent Rb(2) and five equivalent Rb(1) atoms.