Na3MgP2HO8 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 9-coordinate geometry to one H(1), one O(3), two equivalent O(2), two equivalent O(4), and three equivalent O(1) atoms. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with six 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 three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-44°. H(1) is bonded in a linear geometry to two equivalent Na(1) and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to three equivalent Na(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one P(1), and one H(1) 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 P(1) atom.
Na3MgP2HO8 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 9-coordinate geometry to one H(1), one O(3), two equivalent O(2), two equivalent O(4), and three equivalent O(1) atoms. The Na(1)-H(1) bond length is 2.55 Å. The Na(1)-O(3) bond length is 2.29 Å. There is one shorter (2.37 Å) and one longer (2.78 Å) Na(1)-O(2) bond length. There is one shorter (2.55 Å) and one longer (2.65 Å) Na(1)-O(4) bond length. There are a spread of Na(1)-O(1) bond distances ranging from 2.29-2.86 Å. In the second Na site, Na(2) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Na(2)-O(2) bond lengths are 2.44 Å. Both Na(2)-O(3) bond lengths are 2.49 Å. Both Na(2)-O(4) bond lengths are 2.43 Å. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MgO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Both Mg(1)-O(1) bond lengths are 2.03 Å. Both Mg(1)-O(2) bond lengths are 2.11 Å. Both Mg(1)-O(4) bond lengths are 2.13 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 three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-44°. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.57 Å. The P(1)-O(4) bond length is 1.53 Å. H(1) is bonded in a linear geometry to two equivalent Na(1) and two equivalent O(3) atoms. Both H(1)-O(3) bond lengths are 1.20 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to three equivalent Na(1), one Mg(1), and one P(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Na(2), two equivalent Na(1), one Mg(1), and one P(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one P(1), and one H(1) 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 P(1) atom.