GeS2 crystallizes in the monoclinic Pc space group. There are six inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one S(11), one S(2), one S(3), and one S(4) atom to form corner-sharing GeS4 tetrahedra. In the second Ge site, Ge(2) is bonded to one S(10), one S(3), one S(5), and one S(8) atom to form corner-sharing GeS4 tetrahedra. In the third Ge site, Ge(3) is bonded to one S(1), one S(11), one S(7), and one S(9) atom to form corner-sharing GeS4 tetrahedra. In the fourth Ge site, Ge(4) is bonded to one S(7), one S(9), and two equivalent S(12) atoms to form corner-sharing GeS4 tetrahedra. In the fifth Ge site, Ge(5) is bonded to one S(5), one S(8), and two equivalent S(6) atoms to form corner-sharing GeS4 tetrahedra. In the sixth Ge site, Ge(6) is bonded to one S(1), one S(10), one S(2), and one S(4) atom to form corner-sharing GeS4 tetrahedra. There are twelve inequivalent S sites. In the first S site, S(1) is bonded in a water-like geometry to one Ge(3) and one Ge(6) atom. In the second S site, S(2) is bonded in a water-like geometry to one Ge(1) and one Ge(6) atom. In the third S site, S(3) is bonded in a water-like geometry to one Ge(1) and one Ge(2) atom. In the fourth S site, S(4) is bonded in a water-like geometry to one Ge(1) and one Ge(6) atom. In the fifth S site, S(5) is bonded in a water-like geometry to one Ge(2) and one Ge(5) atom. In the sixth S site, S(6) is bonded in a water-like geometry to two equivalent Ge(5) atoms. In the seventh S site, S(7) is bonded in a water-like geometry to one Ge(3) and one Ge(4) atom. In the eighth S site, S(8) is bonded in a water-like geometry to one Ge(2) and one Ge(5) atom. In the ninth S site, S(9) is bonded in a water-like geometry to one Ge(3) and one Ge(4) atom. In the tenth S site, S(10) is bonded in a water-like geometry to one Ge(2) and one Ge(6) atom. In the eleventh S site, S(11) is bonded in a water-like geometry to one Ge(1) and one Ge(3) atom. In the twelfth S site, S(12) is bonded in a water-like geometry to two equivalent Ge(4) atoms.
GeS2 crystallizes in the monoclinic Pc space group. There are six inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one S(11), one S(2), one S(3), and one S(4) atom to form corner-sharing GeS4 tetrahedra. The Ge(1)-S(11) bond length is 2.23 Å. The Ge(1)-S(2) bond length is 2.23 Å. The Ge(1)-S(3) bond length is 2.22 Å. The Ge(1)-S(4) bond length is 2.22 Å. In the second Ge site, Ge(2) is bonded to one S(10), one S(3), one S(5), and one S(8) atom to form corner-sharing GeS4 tetrahedra. The Ge(2)-S(10) bond length is 2.23 Å. The Ge(2)-S(3) bond length is 2.23 Å. The Ge(2)-S(5) bond length is 2.23 Å. The Ge(2)-S(8) bond length is 2.23 Å. In the third Ge site, Ge(3) is bonded to one S(1), one S(11), one S(7), and one S(9) atom to form corner-sharing GeS4 tetrahedra. The Ge(3)-S(1) bond length is 2.23 Å. The Ge(3)-S(11) bond length is 2.23 Å. The Ge(3)-S(7) bond length is 2.23 Å. The Ge(3)-S(9) bond length is 2.23 Å. In the fourth Ge site, Ge(4) is bonded to one S(7), one S(9), and two equivalent S(12) atoms to form corner-sharing GeS4 tetrahedra. The Ge(4)-S(7) bond length is 2.23 Å. The Ge(4)-S(9) bond length is 2.22 Å. There is one shorter (2.22 Å) and one longer (2.23 Å) Ge(4)-S(12) bond length. In the fifth Ge site, Ge(5) is bonded to one S(5), one S(8), and two equivalent S(6) atoms to form corner-sharing GeS4 tetrahedra. The Ge(5)-S(5) bond length is 2.23 Å. The Ge(5)-S(8) bond length is 2.22 Å. There is one shorter (2.22 Å) and one longer (2.23 Å) Ge(5)-S(6) bond length. In the sixth Ge site, Ge(6) is bonded to one S(1), one S(10), one S(2), and one S(4) atom to form corner-sharing GeS4 tetrahedra. The Ge(6)-S(1) bond length is 2.22 Å. The Ge(6)-S(10) bond length is 2.23 Å. The Ge(6)-S(2) bond length is 2.22 Å. The Ge(6)-S(4) bond length is 2.23 Å. There are twelve inequivalent S sites. In the first S site, S(1) is bonded in a water-like geometry to one Ge(3) and one Ge(6) atom. In the second S site, S(2) is bonded in a water-like geometry to one Ge(1) and one Ge(6) atom. In the third S site, S(3) is bonded in a water-like geometry to one Ge(1) and one Ge(2) atom. In the fourth S site, S(4) is bonded in a water-like geometry to one Ge(1) and one Ge(6) atom. In the fifth S site, S(5) is bonded in a water-like geometry to one Ge(2) and one Ge(5) atom. In the sixth S site, S(6) is bonded in a water-like geometry to two equivalent Ge(5) atoms. In the seventh S site, S(7) is bonded in a water-like geometry to one Ge(3) and one Ge(4) atom. In the eighth S site, S(8) is bonded in a water-like geometry to one Ge(2) and one Ge(5) atom. In the ninth S site, S(9) is bonded in a water-like geometry to one Ge(3) and one Ge(4) atom. In the tenth S site, S(10) is bonded in a water-like geometry to one Ge(2) and one Ge(6) atom. In the eleventh S site, S(11) is bonded in a water-like geometry to one Ge(1) and one Ge(3) atom. In the twelfth S site, S(12) is bonded in a water-like geometry to two equivalent Ge(4) atoms.