MgSb2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form distorted SbO5 square pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second Sb site, Sb(2) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), and one O(7) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O5 square pyramids and  a cornercorner with one Mg(1)O5 trigonal bipyramid. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O5 square pyramids,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Sb(2), and one H(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sb(1), one P(2), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sb(1) and one H(1) atom.
MgSb2P2(HO5)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(3), one O(5), one O(6), and one O(7) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one Sb(1)O5 square pyramid,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.01 Å. The Mg(1)-O(3) bond length is 2.10 Å. The Mg(1)-O(5) bond length is 2.16 Å. The Mg(1)-O(6) bond length is 1.99 Å. The Mg(1)-O(7) bond length is 2.09 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(2), one O(3), one O(8), and one O(9) atom to form distorted SbO5 square pyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The Sb(1)-O(10) bond length is 2.00 Å. The Sb(1)-O(2) bond length is 2.38 Å. The Sb(1)-O(3) bond length is 2.48 Å. The Sb(1)-O(8) bond length is 2.12 Å. The Sb(1)-O(9) bond length is 2.21 Å. In the second Sb site, Sb(2) is bonded in a 4-coordinate geometry to one O(1), one O(4), one O(5), and one O(7) atom. The Sb(2)-O(1) bond length is 2.06 Å. The Sb(2)-O(4) bond length is 2.09 Å. The Sb(2)-O(5) bond length is 2.14 Å. The Sb(2)-O(7) bond length is 2.41 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O5 square pyramids and  a cornercorner with one Mg(1)O5 trigonal bipyramid. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(5) bond length is 1.60 Å. The P(1)-O(8) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(3), one O(6), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Sb(1)O5 square pyramids,  a cornercorner with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. The P(2)-O(3) bond length is 1.57 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.57 Å. The P(2)-O(9) bond length is 1.56 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(10) atom. The H(1)-O(10) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(9) atom. The H(2)-O(1) bond length is 1.00 Å. The H(2)-O(9) bond length is 1.76 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Sb(2), and one H(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sb(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one Sb(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mg(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sb(1), one P(2), and one H(2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sb(1) and one H(1) atom.