The structure described by Mg2Mn3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form MgO4 tetrahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. In the second Mg site, Mg(2) is bonded to one O(2), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form MgO6 octahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with three equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-16°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms to form MnO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-16°. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. In the third Mn site, Mn(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with three equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Mn(3), and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Mg(2), one Mn(1), one Mn(2), and one Mn(3) atom to form edge-sharing OMg2Mn3 square pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mn(2), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mn(1), and one Mn(3) atom. is represented by the CIF file [CIF]
data_Mg2Mn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.640
_cell_length_b   6.086
_cell_length_c   7.850
_cell_angle_alpha   98.989
_cell_angle_beta   114.897
_cell_angle_gamma   103.737
_symmetry_Int_Tables_number   1
_cell_volume   267.432
_cell_formula_units_Z   2
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  0.306  0.675  0.464  1.0
  Mg  Mg1  1  0.342  0.843  0.065  1.0
  Mg  Mg2  1  0.658  0.157  0.935  1.0
  Mg  Mg3  1  0.694  0.325  0.536  1.0
  Mn  Mn4  1  0.216  0.222  0.642  1.0
  Mn  Mn5  1  0.081  0.071  0.222  1.0
  Mn  Mn6  1  0.637  0.641  0.922  1.0
  Mn  Mn7  1  0.363  0.359  0.078  1.0
  Mn  Mn8  1  0.919  0.929  0.778  1.0
  Mn  Mn9  1  0.784  0.778  0.358  1.0
  O  O10  1  0.116  0.892  0.411  1.0
  O  O11  1  0.317  0.536  0.884  1.0
  O  O12  1  0.139  0.342  0.422  1.0
  O  O13  1  0.020  0.222  0.007  1.0
  O  O14  1  0.304  0.085  0.877  1.0
  O  O15  1  0.570  0.828  0.743  1.0
  O  O16  1  0.437  0.654  0.270  1.0
  O  O17  1  0.563  0.346  0.730  1.0
  O  O18  1  0.430  0.172  0.257  1.0
  O  O19  1  0.696  0.915  0.123  1.0
  O  O20  1  0.980  0.778  0.993  1.0
  O  O21  1  0.861  0.658  0.578  1.0
  O  O22  1  0.683  0.464  0.116  1.0
  O  O23  1  0.884  0.109  0.589  1.0
[/CIF]
.
The structure described by Mg2Mn3O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form MgO4 tetrahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-64°. In the second Mg site, Mg(2) is bonded to one O(2), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form MgO6 octahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with three equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-16°. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms to form MnO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra, corners with four equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mg(2)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-16°. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, edges with two equivalent Mg(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. In the third Mn site, Mn(3) is bonded to one O(4), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with three equivalent Mg(2)O6 octahedra. The corner-sharing octahedral tilt angles are 13°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Mn(1), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mg(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Mg(2), one Mn(3), and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded to two equivalent Mg(2), one Mn(1), one Mn(2), and one Mn(3) atom to form edge-sharing OMg2Mn3 square pyramids. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mn(2), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mg(2), one Mn(1), and one Mn(3) atom. is represented by the CIF file [CIF]
data_Mg2Mn3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.640
_cell_length_b   6.086
_cell_length_c   7.850
_cell_angle_alpha   98.989
_cell_angle_beta   114.897
_cell_angle_gamma   103.737
_symmetry_Int_Tables_number   1
_cell_volume   267.432
_cell_formula_units_Z   2
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  0.306  0.675  0.464  1.0
  Mg  Mg1  1  0.342  0.843  0.065  1.0
  Mg  Mg2  1  0.658  0.157  0.935  1.0
  Mg  Mg3  1  0.694  0.325  0.536  1.0
  Mn  Mn4  1  0.216  0.222  0.642  1.0
  Mn  Mn5  1  0.081  0.071  0.222  1.0
  Mn  Mn6  1  0.637  0.641  0.922  1.0
  Mn  Mn7  1  0.363  0.359  0.078  1.0
  Mn  Mn8  1  0.919  0.929  0.778  1.0
  Mn  Mn9  1  0.784  0.778  0.358  1.0
  O  O10  1  0.116  0.892  0.411  1.0
  O  O11  1  0.317  0.536  0.884  1.0
  O  O12  1  0.139  0.342  0.422  1.0
  O  O13  1  0.020  0.222  0.007  1.0
  O  O14  1  0.304  0.085  0.877  1.0
  O  O15  1  0.570  0.828  0.743  1.0
  O  O16  1  0.437  0.654  0.270  1.0
  O  O17  1  0.563  0.346  0.730  1.0
  O  O18  1  0.430  0.172  0.257  1.0
  O  O19  1  0.696  0.915  0.123  1.0
  O  O20  1  0.980  0.778  0.993  1.0
  O  O21  1  0.861  0.658  0.578  1.0
  O  O22  1  0.683  0.464  0.116  1.0
  O  O23  1  0.884  0.109  0.589  1.0
[/CIF]
.