Na4Mg(MoO4)2 crystallizes in the orthorhombic F222 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. Mg(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a distorted tetrahedral geometry to four equivalent O(2) atoms. In the second Mo site, Mo(2) is bonded in a distorted tetrahedral geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Mo(1) atom. In the second O site, O(1) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Mo(2) atom.
Na4Mg(MoO4)2 crystallizes in the orthorhombic F222 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Na(1)-O(1) bond lengths are 2.33 Å. There are two shorter (2.40 Å) and two longer (2.53 Å) Na(1)-O(2) bond lengths. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(2) and four equivalent O(1) atoms. Both Na(2)-O(2) bond lengths are 2.31 Å. There are two shorter (2.60 Å) and two longer (2.86 Å) Na(2)-O(1) bond lengths. Mg(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Mg(1)-O(1) bond lengths are 2.64 Å. All Mg(1)-O(2) bond lengths are 2.24 Å. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a distorted tetrahedral geometry to four equivalent O(2) atoms. All Mo(1)-O(2) bond lengths are 1.87 Å. In the second Mo site, Mo(2) is bonded in a distorted tetrahedral geometry to four equivalent O(1) atoms. All Mo(2)-O(1) bond lengths are 1.87 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one Mo(1) atom. In the second O site, O(1) is bonded in a 5-coordinate geometry to one Na(1), two equivalent Na(2), one Mg(1), and one Mo(2) atom.