KMgSb(PO4)2 crystallizes in the trigonal R3 space group. K(1) is bonded in a distorted hexagonal planar geometry to three equivalent O(1) and three equivalent O(3) atoms. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(2) and three equivalent O(4) atoms. Sb(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form SbO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1) and three equivalent O(2) atoms to form PO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. In the second P site, P(2) is bonded to one O(3) and three equivalent O(4) atoms to form PO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to three equivalent K(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to three equivalent K(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(1), and one P(2) atom.
KMgSb(PO4)2 crystallizes in the trigonal R3 space group. K(1) is bonded in a distorted hexagonal planar geometry to three equivalent O(1) and three equivalent O(3) atoms. All K(1)-O(1) bond lengths are 3.22 Å. All K(1)-O(3) bond lengths are 3.21 Å. Mg(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent O(2) and three equivalent O(4) atoms. All Mg(1)-O(2) bond lengths are 1.93 Å. All Mg(1)-O(4) bond lengths are 2.46 Å. Sb(1) is bonded to three equivalent O(2) and three equivalent O(4) atoms to form SbO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. All Sb(1)-O(2) bond lengths are 2.56 Å. All Sb(1)-O(4) bond lengths are 2.13 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1) and three equivalent O(2) atoms to form PO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 53°. The P(1)-O(1) bond length is 1.50 Å. All P(1)-O(2) bond lengths are 1.59 Å. In the second P site, P(2) is bonded to one O(3) and three equivalent O(4) atoms to form PO4 tetrahedra that share corners with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 35°. The P(2)-O(3) bond length is 1.48 Å. All P(2)-O(4) bond lengths are 1.59 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to three equivalent K(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Sb(1), and one P(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to three equivalent K(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Sb(1), and one P(2) atom.