Rb3NaMg(MoO4)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. In the second Rb site, Rb(2) is bonded in a linear geometry to two equivalent O(2) atoms. Na(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. Mo(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Na(1), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Mo(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Rb(1) and one Mo(1) atom.
Rb3NaMg(MoO4)2 crystallizes in the monoclinic C2/m space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to one O(3), two equivalent O(1), and three equivalent O(2) atoms. The Rb(1)-O(3) bond length is 2.72 Å. Both Rb(1)-O(1) bond lengths are 2.92 Å. There is one shorter (3.15 Å) and two longer (3.21 Å) Rb(1)-O(2) bond lengths. In the second Rb site, Rb(2) is bonded in a linear geometry to two equivalent O(2) atoms. Both Rb(2)-O(2) bond lengths are 2.95 Å. Na(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Na(1)-O(1) bond lengths are 2.34 Å. Mg(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.00 Å. Mo(1) is bonded in a tetrahedral geometry to one O(2), one O(3), and two equivalent O(1) atoms. The Mo(1)-O(2) bond length is 1.82 Å. The Mo(1)-O(3) bond length is 1.80 Å. Both Mo(1)-O(1) bond lengths are 1.95 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Rb(1), one Na(1), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Rb(2), three equivalent Rb(1), and one Mo(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Rb(1) and one Mo(1) atom.