The crystal structure described by MgV2Mn2O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one V(1)O5 trigonal bipyramid,  a cornercorner with one V(2)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra,  an edgeedge with one V(1)O5 trigonal bipyramid, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form VO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(2)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid,  an edgeedge with one V(2)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 23-62°. In the second V site, V(2) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(7) atom to form VO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(1)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 25-54°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent V(1)O5 trigonal bipyramids, corners with three equivalent Mg(1)O5 trigonal bipyramids, corners with three equivalent V(2)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid, corners with two equivalent V(1)O5 trigonal bipyramids, corners with two equivalent V(2)O5 trigonal bipyramids,  an edgeedge with one V(1)O5 trigonal bipyramid,  an edgeedge with one V(2)O5 trigonal bipyramid, edges with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one V(2), one Mn(1), and one Mn(2) atom to form distorted OMgMn2V trigonal pyramids that share corners with three equivalent O(2)MgMn2V tetrahedra,  a cornercorner with one O(7)Mn2V2 trigonal pyramid, corners with three equivalent O(6)Mn2V2 trigonal pyramids, and  an edgeedge with one O(7)Mn2V2 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one V(1), one Mn(1), and one Mn(2) atom to form distorted OMgMn2V tetrahedra that share  a cornercorner with one O(6)Mn2V2 trigonal pyramid, corners with three equivalent O(1)MgMn2V trigonal pyramids, corners with three equivalent O(7)Mn2V2 trigonal pyramids, and  an edgeedge with one O(6)Mn2V2 trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one V(2) atom. In the sixth O site, O(6) is bonded to one V(1), one V(2), one Mn(1), and one Mn(2) atom to form OMn2V2 trigonal pyramids that share  a cornercorner with one O(2)MgMn2V tetrahedra, corners with three equivalent O(1)MgMn2V trigonal pyramids,  an edgeedge with one O(2)MgMn2V tetrahedra, and edges with two equivalent O(7)Mn2V2 trigonal pyramids. In the seventh O site, O(7) is bonded to one V(1), one V(2), one Mn(1), and one Mn(2) atom to form distorted OMn2V2 trigonal pyramids that share corners with three equivalent O(2)MgMn2V tetrahedra,  a cornercorner with one O(1)MgMn2V trigonal pyramid,  an edgeedge with one O(1)MgMn2V trigonal pyramid, and edges with two equivalent O(6)Mn2V2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgMn2V2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.335
_cell_length_b   5.733
_cell_length_c   5.661
_cell_angle_alpha   112.058
_cell_angle_beta   99.728
_cell_angle_gamma   97.556
_symmetry_Int_Tables_number   1
_cell_volume   154.527
_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  0.480  0.294  0.715  1.0
  Mn  Mn1  1  0.033  0.778  0.156  1.0
  Mn  Mn2  1  0.994  0.161  0.834  1.0
  V  V3  1  0.393  0.771  0.757  1.0
  V  V4  1  0.626  0.250  0.251  1.0
  O  O5  1  0.767  0.422  0.067  1.0
  O  O6  1  0.225  0.932  0.563  1.0
  O  O7  1  0.234  0.530  0.871  1.0
  O  O8  1  0.741  0.140  0.500  1.0
  O  O9  1  0.490  0.506  0.496  1.0
  O  O10  1  0.287  0.052  0.062  1.0
  O  O11  1  0.728  0.927  0.966  1.0
[/CIF]
.
The crystal structure described by MgV2Mn2O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form MgO5 trigonal bipyramids that share  a cornercorner with one V(1)O5 trigonal bipyramid,  a cornercorner with one V(2)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra,  an edgeedge with one V(1)O5 trigonal bipyramid, and  an edgeedge with one V(2)O5 trigonal bipyramid. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form VO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(2)O5 trigonal bipyramid, corners with two equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid,  an edgeedge with one V(2)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 23-62°. In the second V site, V(2) is bonded to one O(1), one O(4), one O(5), one O(6), and one O(7) atom to form VO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mg(1)O5 trigonal bipyramid,  a cornercorner with one V(1)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 25-54°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(6), and one O(7) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent V(1)O5 trigonal bipyramids, corners with three equivalent Mg(1)O5 trigonal bipyramids, corners with three equivalent V(2)O5 trigonal bipyramids, edges with two equivalent Mn(2)O6 octahedra, and  an edgeedge with one V(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. In the second Mn site, Mn(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mn(1)O5 trigonal bipyramid, corners with two equivalent V(1)O5 trigonal bipyramids, corners with two equivalent V(2)O5 trigonal bipyramids,  an edgeedge with one V(1)O5 trigonal bipyramid,  an edgeedge with one V(2)O5 trigonal bipyramid, edges with two equivalent Mg(1)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Mg(1), one V(2), one Mn(1), and one Mn(2) atom to form distorted OMgMn2V trigonal pyramids that share corners with three equivalent O(2)MgMn2V tetrahedra,  a cornercorner with one O(7)Mn2V2 trigonal pyramid, corners with three equivalent O(6)Mn2V2 trigonal pyramids, and  an edgeedge with one O(7)Mn2V2 trigonal pyramid. In the second O site, O(2) is bonded to one Mg(1), one V(1), one Mn(1), and one Mn(2) atom to form distorted OMgMn2V tetrahedra that share  a cornercorner with one O(6)Mn2V2 trigonal pyramid, corners with three equivalent O(1)MgMn2V trigonal pyramids, corners with three equivalent O(7)Mn2V2 trigonal pyramids, and  an edgeedge with one O(6)Mn2V2 trigonal pyramid. In the third O site, O(3) is bonded in a rectangular see-saw-like geometry to one Mg(1), one V(1), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one V(2) atom. In the sixth O site, O(6) is bonded to one V(1), one V(2), one Mn(1), and one Mn(2) atom to form OMn2V2 trigonal pyramids that share  a cornercorner with one O(2)MgMn2V tetrahedra, corners with three equivalent O(1)MgMn2V trigonal pyramids,  an edgeedge with one O(2)MgMn2V tetrahedra, and edges with two equivalent O(7)Mn2V2 trigonal pyramids. In the seventh O site, O(7) is bonded to one V(1), one V(2), one Mn(1), and one Mn(2) atom to form distorted OMn2V2 trigonal pyramids that share corners with three equivalent O(2)MgMn2V tetrahedra,  a cornercorner with one O(1)MgMn2V trigonal pyramid,  an edgeedge with one O(1)MgMn2V trigonal pyramid, and edges with two equivalent O(6)Mn2V2 trigonal pyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgMn2V2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.335
_cell_length_b   5.733
_cell_length_c   5.661
_cell_angle_alpha   112.058
_cell_angle_beta   99.728
_cell_angle_gamma   97.556
_symmetry_Int_Tables_number   1
_cell_volume   154.527
_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  0.480  0.294  0.715  1.0
  Mn  Mn1  1  0.033  0.778  0.156  1.0
  Mn  Mn2  1  0.994  0.161  0.834  1.0
  V  V3  1  0.393  0.771  0.757  1.0
  V  V4  1  0.626  0.250  0.251  1.0
  O  O5  1  0.767  0.422  0.067  1.0
  O  O6  1  0.225  0.932  0.563  1.0
  O  O7  1  0.234  0.530  0.871  1.0
  O  O8  1  0.741  0.140  0.500  1.0
  O  O9  1  0.490  0.506  0.496  1.0
  O  O10  1  0.287  0.052  0.062  1.0
  O  O11  1  0.728  0.927  0.966  1.0
[/CIF]
.