RbMgPO4 crystallizes in the orthorhombic Pna2_1 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), three equivalent O(1), and three equivalent O(2) atoms. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to three equivalent Rb(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Mg(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Mg(1), and one P(1) atom.
RbMgPO4 crystallizes in the orthorhombic Pna2_1 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(3), two equivalent O(4), three equivalent O(1), and three equivalent O(2) atoms. There is one shorter (2.95 Å) and one longer (3.14 Å) Rb(1)-O(3) bond length. There is one shorter (2.83 Å) and one longer (3.42 Å) Rb(1)-O(4) bond length. There are a spread of Rb(1)-O(1) bond distances ranging from 2.92-3.47 Å. There are a spread of Rb(1)-O(2) bond distances ranging from 3.25-3.44 Å. Mg(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MgO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. The Mg(1)-O(1) bond length is 1.95 Å. The Mg(1)-O(2) bond length is 1.90 Å. The Mg(1)-O(3) bond length is 1.91 Å. The Mg(1)-O(4) bond length is 1.93 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with four equivalent Mg(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.54 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to three equivalent Rb(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a linear geometry to three equivalent Rb(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Mg(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Mg(1), and one P(1) atom.