The compound described by MgMn3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with six equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with three equivalent Mg(1)O5 square pyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and edges with two equivalent Mn(1)O5 trigonal bipyramids. In the second Mn site, Mn(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 square pyramid, corners with four equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mg(1)O5 square pyramid, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(1) and one Mn(2) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Mn(1) atom. In the third O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. is represented by the CIF card [CIF]
data_MgMn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.456
_cell_length_b   9.611
_cell_length_c   10.390
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   544.879
_cell_formula_units_Z   4
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  0.374  0.044  0.250  1.0
  Mg  Mg1  1  0.874  0.456  0.750  1.0
  Mg  Mg2  1  0.626  0.956  0.750  1.0
  Mg  Mg3  1  0.126  0.544  0.250  1.0
  Mn  Mn4  1  0.710  0.701  0.972  1.0
  Mn  Mn5  1  0.210  0.799  0.028  1.0
  Mn  Mn6  1  0.290  0.299  0.472  1.0
  Mn  Mn7  1  0.790  0.201  0.528  1.0
  Mn  Mn8  1  0.708  0.765  0.250  1.0
  Mn  Mn9  1  0.208  0.735  0.750  1.0
  Mn  Mn10  1  0.292  0.235  0.750  1.0
  Mn  Mn11  1  0.792  0.265  0.250  1.0
  Mn  Mn12  1  0.210  0.799  0.472  1.0
  Mn  Mn13  1  0.710  0.701  0.528  1.0
  Mn  Mn14  1  0.790  0.201  0.972  1.0
  Mn  Mn15  1  0.290  0.299  0.028  1.0
  O  O16  1  0.045  0.291  0.878  1.0
  O  O17  1  0.545  0.209  0.122  1.0
  O  O18  1  0.955  0.709  0.378  1.0
  O  O19  1  0.455  0.791  0.622  1.0
  O  O20  1  0.955  0.709  0.122  1.0
  O  O21  1  0.455  0.791  0.878  1.0
  O  O22  1  0.045  0.291  0.622  1.0
  O  O23  1  0.545  0.209  0.378  1.0
  O  O24  1  0.520  0.281  0.882  1.0
  O  O25  1  0.020  0.219  0.118  1.0
  O  O26  1  0.480  0.719  0.382  1.0
  O  O27  1  0.980  0.781  0.618  1.0
  O  O28  1  0.480  0.719  0.118  1.0
  O  O29  1  0.980  0.781  0.882  1.0
  O  O30  1  0.520  0.281  0.618  1.0
  O  O31  1  0.020  0.219  0.382  1.0
  O  O32  1  0.802  0.443  0.250  1.0
  O  O33  1  0.302  0.057  0.750  1.0
  O  O34  1  0.198  0.557  0.750  1.0
  O  O35  1  0.698  0.943  0.250  1.0
  O  O36  1  0.774  0.036  0.590  1.0
  O  O37  1  0.274  0.464  0.410  1.0
  O  O38  1  0.226  0.964  0.090  1.0
  O  O39  1  0.726  0.536  0.910  1.0
  O  O40  1  0.226  0.964  0.410  1.0
  O  O41  1  0.726  0.536  0.590  1.0
  O  O42  1  0.774  0.036  0.910  1.0
  O  O43  1  0.274  0.464  0.090  1.0
[/CIF]
.
The compound described by MgMn3O7 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded to one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted MgO5 square pyramids that share  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with six equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share corners with three equivalent Mg(1)O5 square pyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O5 trigonal bipyramid, and edges with two equivalent Mn(1)O5 trigonal bipyramids. In the second Mn site, Mn(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(2) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O5 square pyramid, corners with four equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mg(1)O5 square pyramid, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(1) and one Mn(2) atom. In the second O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Mn(1) atom. In the third O site, O(1) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(1) atoms. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. is represented by the CIF card [CIF]
data_MgMn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.456
_cell_length_b   9.611
_cell_length_c   10.390
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   544.879
_cell_formula_units_Z   4
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  0.374  0.044  0.250  1.0
  Mg  Mg1  1  0.874  0.456  0.750  1.0
  Mg  Mg2  1  0.626  0.956  0.750  1.0
  Mg  Mg3  1  0.126  0.544  0.250  1.0
  Mn  Mn4  1  0.710  0.701  0.972  1.0
  Mn  Mn5  1  0.210  0.799  0.028  1.0
  Mn  Mn6  1  0.290  0.299  0.472  1.0
  Mn  Mn7  1  0.790  0.201  0.528  1.0
  Mn  Mn8  1  0.708  0.765  0.250  1.0
  Mn  Mn9  1  0.208  0.735  0.750  1.0
  Mn  Mn10  1  0.292  0.235  0.750  1.0
  Mn  Mn11  1  0.792  0.265  0.250  1.0
  Mn  Mn12  1  0.210  0.799  0.472  1.0
  Mn  Mn13  1  0.710  0.701  0.528  1.0
  Mn  Mn14  1  0.790  0.201  0.972  1.0
  Mn  Mn15  1  0.290  0.299  0.028  1.0
  O  O16  1  0.045  0.291  0.878  1.0
  O  O17  1  0.545  0.209  0.122  1.0
  O  O18  1  0.955  0.709  0.378  1.0
  O  O19  1  0.455  0.791  0.622  1.0
  O  O20  1  0.955  0.709  0.122  1.0
  O  O21  1  0.455  0.791  0.878  1.0
  O  O22  1  0.045  0.291  0.622  1.0
  O  O23  1  0.545  0.209  0.378  1.0
  O  O24  1  0.520  0.281  0.882  1.0
  O  O25  1  0.020  0.219  0.118  1.0
  O  O26  1  0.480  0.719  0.382  1.0
  O  O27  1  0.980  0.781  0.618  1.0
  O  O28  1  0.480  0.719  0.118  1.0
  O  O29  1  0.980  0.781  0.882  1.0
  O  O30  1  0.520  0.281  0.618  1.0
  O  O31  1  0.020  0.219  0.382  1.0
  O  O32  1  0.802  0.443  0.250  1.0
  O  O33  1  0.302  0.057  0.750  1.0
  O  O34  1  0.198  0.557  0.750  1.0
  O  O35  1  0.698  0.943  0.250  1.0
  O  O36  1  0.774  0.036  0.590  1.0
  O  O37  1  0.274  0.464  0.410  1.0
  O  O38  1  0.226  0.964  0.090  1.0
  O  O39  1  0.726  0.536  0.910  1.0
  O  O40  1  0.226  0.964  0.410  1.0
  O  O41  1  0.726  0.536  0.590  1.0
  O  O42  1  0.774  0.036  0.910  1.0
  O  O43  1  0.274  0.464  0.090  1.0
[/CIF]
.