The structure described by MgMn2(PO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form distorted MgO5 square pyramids that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one P(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(1)O5 square pyramids, corners with three equivalent Mg(1)O5 square pyramids, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mg(1)O5 square pyramids, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 square pyramid. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Mn(1)O5 square pyramids,  an edgeedge with one Mn(1)O5 square pyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. is represented by the CIF card [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.142
_cell_length_b   8.594
_cell_length_c   5.086
_cell_angle_alpha   68.450
_cell_angle_beta   60.148
_cell_angle_gamma   73.779
_symmetry_Int_Tables_number   1
_cell_volume   180.003
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  1  0.508  0.540  0.393  1.0
  Mn  Mn1  1  0.144  0.198  0.415  1.0
  Mn  Mn2  1  0.786  0.821  0.598  1.0
  P  P3  1  0.189  0.621  0.048  1.0
  P  P4  1  0.547  0.132  0.727  1.0
  O  O5  1  0.175  0.739  0.227  1.0
  O  O6  1  0.280  0.445  0.240  1.0
  O  O7  1  0.246  0.146  0.013  1.0
  O  O8  1  0.505  0.061  0.508  1.0
  O  O9  1  0.448  0.663  0.704  1.0
  O  O10  1  0.672  0.307  0.550  1.0
  O  O11  1  0.893  0.630  0.028  1.0
  O  O12  1  0.813  0.006  0.780  1.0
[/CIF]
.
The structure described by MgMn2(PO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form distorted MgO5 square pyramids that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form distorted MnO5 square pyramids that share corners with two equivalent Mg(1)O5 square pyramids,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one P(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(5), one O(7), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(1)O5 square pyramids, corners with three equivalent Mg(1)O5 square pyramids, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mg(1)O5 square pyramids, corners with three equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 square pyramid. In the second P site, P(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid, corners with two equivalent Mn(1)O5 square pyramids,  an edgeedge with one Mn(1)O5 square pyramid, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Mn(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(2) atom. is represented by the CIF card [CIF]
data_MgMn2(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.142
_cell_length_b   8.594
_cell_length_c   5.086
_cell_angle_alpha   68.450
_cell_angle_beta   60.148
_cell_angle_gamma   73.779
_symmetry_Int_Tables_number   1
_cell_volume   180.003
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Mg  Mg0  1  0.508  0.540  0.393  1.0
  Mn  Mn1  1  0.144  0.198  0.415  1.0
  Mn  Mn2  1  0.786  0.821  0.598  1.0
  P  P3  1  0.189  0.621  0.048  1.0
  P  P4  1  0.547  0.132  0.727  1.0
  O  O5  1  0.175  0.739  0.227  1.0
  O  O6  1  0.280  0.445  0.240  1.0
  O  O7  1  0.246  0.146  0.013  1.0
  O  O8  1  0.505  0.061  0.508  1.0
  O  O9  1  0.448  0.663  0.704  1.0
  O  O10  1  0.672  0.307  0.550  1.0
  O  O11  1  0.893  0.630  0.028  1.0
  O  O12  1  0.813  0.006  0.780  1.0
[/CIF]
.