Na4Mg(WO4)2 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Mg(1) is bonded to two equivalent Na(1), two equivalent Na(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted MgNa4O4 tetrahedra that share corners with four equivalent W(2)O4 tetrahedra. There are two inequivalent W sites. In the first W site, W(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second W site, W(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form WO4 tetrahedra that share corners with four equivalent Mg(1)Na4O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one W(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one W(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one W(2) atom.
Na4Mg(WO4)2 crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. The Na(1)-Mg(1) bond length is 2.33 Å. The Na(1)-O(1) bond length is 2.31 Å. The Na(1)-O(3) bond length is 2.52 Å. Both Na(1)-O(2) bond lengths are 2.30 Å. Both Na(1)-O(4) bond lengths are 2.52 Å. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The Na(2)-Mg(1) bond length is 2.33 Å. The Na(2)-O(2) bond length is 2.31 Å. The Na(2)-O(4) bond length is 2.52 Å. Both Na(2)-O(1) bond lengths are 2.31 Å. Both Na(2)-O(3) bond lengths are 2.51 Å. Mg(1) is bonded to two equivalent Na(1), two equivalent Na(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted MgNa4O4 tetrahedra that share corners with four equivalent W(2)O4 tetrahedra. Both Mg(1)-O(3) bond lengths are 2.01 Å. Both Mg(1)-O(4) bond lengths are 2.00 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both W(1)-O(1) bond lengths are 1.82 Å. Both W(1)-O(2) bond lengths are 1.82 Å. In the second W site, W(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form WO4 tetrahedra that share corners with four equivalent Mg(1)Na4O4 tetrahedra. Both W(2)-O(3) bond lengths are 2.04 Å. Both W(2)-O(4) bond lengths are 2.04 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one W(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(2), two equivalent Na(1), and one W(1) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one W(2) atom.