The material structure described by Mg2Nb2MnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing MnO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Nb(1) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. is represented by the CIF file [CIF]
data_Mg2MnNb2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.183
_cell_length_b   10.183
_cell_length_c   5.228
_cell_angle_alpha   89.696
_cell_angle_beta   89.696
_cell_angle_gamma   34.660
_symmetry_Int_Tables_number   1
_cell_volume   308.284
_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  0.588  0.870  0.246  1.0
  Mg  Mg1  1  0.130  0.412  0.254  1.0
  Mg  Mg2  1  0.412  0.130  0.754  1.0
  Mg  Mg3  1  0.870  0.588  0.746  1.0
  Mn  Mn4  1  0.340  0.660  0.250  1.0
  Mn  Mn5  1  0.660  0.340  0.750  1.0
  Nb  Nb6  1  0.714  0.050  0.259  1.0
  Nb  Nb7  1  0.950  0.286  0.241  1.0
  Nb  Nb8  1  0.286  0.950  0.741  1.0
  Nb  Nb9  1  0.050  0.714  0.759  1.0
  O  O10  1  0.818  0.036  0.925  1.0
  O  O11  1  0.964  0.182  0.575  1.0
  O  O12  1  0.182  0.964  0.075  1.0
  O  O13  1  0.036  0.818  0.425  1.0
  O  O14  1  0.565  0.313  0.408  1.0
  O  O15  1  0.687  0.435  0.092  1.0
  O  O16  1  0.435  0.687  0.592  1.0
  O  O17  1  0.313  0.565  0.908  1.0
  O  O18  1  0.706  0.917  0.544  1.0
  O  O19  1  0.083  0.294  0.956  1.0
  O  O20  1  0.163  0.454  0.617  1.0
  O  O21  1  0.546  0.837  0.883  1.0
  O  O22  1  0.837  0.546  0.383  1.0
  O  O23  1  0.454  0.163  0.117  1.0
  O  O24  1  0.917  0.706  0.044  1.0
  O  O25  1  0.294  0.083  0.456  1.0
[/CIF]
.
The material structure described by Mg2Nb2MnO8 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to three equivalent O(3) and three equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. Mn(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form edge-sharing MnO6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Nb(1) and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Nb(1) and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to three equivalent Mg(1) and two equivalent Nb(1) atoms. In the fourth O site, O(4) is bonded to three equivalent Mg(1) and one Nb(1) atom to form a mixture of edge and corner-sharing OMg3Nb trigonal pyramids. is represented by the CIF file [CIF]
data_Mg2MnNb2O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.183
_cell_length_b   10.183
_cell_length_c   5.228
_cell_angle_alpha   89.696
_cell_angle_beta   89.696
_cell_angle_gamma   34.660
_symmetry_Int_Tables_number   1
_cell_volume   308.284
_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  0.588  0.870  0.246  1.0
  Mg  Mg1  1  0.130  0.412  0.254  1.0
  Mg  Mg2  1  0.412  0.130  0.754  1.0
  Mg  Mg3  1  0.870  0.588  0.746  1.0
  Mn  Mn4  1  0.340  0.660  0.250  1.0
  Mn  Mn5  1  0.660  0.340  0.750  1.0
  Nb  Nb6  1  0.714  0.050  0.259  1.0
  Nb  Nb7  1  0.950  0.286  0.241  1.0
  Nb  Nb8  1  0.286  0.950  0.741  1.0
  Nb  Nb9  1  0.050  0.714  0.759  1.0
  O  O10  1  0.818  0.036  0.925  1.0
  O  O11  1  0.964  0.182  0.575  1.0
  O  O12  1  0.182  0.964  0.075  1.0
  O  O13  1  0.036  0.818  0.425  1.0
  O  O14  1  0.565  0.313  0.408  1.0
  O  O15  1  0.687  0.435  0.092  1.0
  O  O16  1  0.435  0.687  0.592  1.0
  O  O17  1  0.313  0.565  0.908  1.0
  O  O18  1  0.706  0.917  0.544  1.0
  O  O19  1  0.083  0.294  0.956  1.0
  O  O20  1  0.163  0.454  0.617  1.0
  O  O21  1  0.546  0.837  0.883  1.0
  O  O22  1  0.837  0.546  0.383  1.0
  O  O23  1  0.454  0.163  0.117  1.0
  O  O24  1  0.917  0.706  0.044  1.0
  O  O25  1  0.294  0.083  0.456  1.0
[/CIF]
.