The material described by MgW2Fe2(O4Cl)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and one Cl(2) atom to form distorted MgClO4 trigonal bipyramids that share edges with two equivalent W(1)O4 tetrahedra and  an edgeedge with one Fe(2)ClO4 trigonal bipyramid. W(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form WO4 tetrahedra that share corners with two equivalent Fe(2)ClO4 trigonal bipyramids and  an edgeedge with one Mg(1)ClO4 trigonal bipyramid. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 5-coordinate geometry to two equivalent O(1), two equivalent O(4), and one Cl(2) atom. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(3), and one Cl(1) atom to form distorted FeClO4 trigonal bipyramids that share corners with four equivalent W(1)O4 tetrahedra and  an edgeedge with one Mg(1)ClO4 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Fe(1) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a single-bond geometry to one Fe(2) atom. In the second Cl site, Cl(2) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Fe(1) atom. is represented by the CIF file [CIF]
data_MgFe2W2(ClO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.458
_cell_length_b   7.193
_cell_length_c   7.193
_cell_angle_alpha   87.189
_cell_angle_beta   88.913
_cell_angle_gamma   91.087
_symmetry_Int_Tables_number   1
_cell_volume   281.978
_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  0.894  0.035  0.465  1.0
  Fe  Fe1  1  0.256  0.264  0.236  1.0
  Fe  Fe2  1  0.726  0.736  0.764  1.0
  W  W3  1  0.008  0.259  0.763  1.0
  W  W4  1  0.008  0.737  0.241  1.0
  Cl  Cl5  1  0.302  0.768  0.732  1.0
  Cl  Cl6  1  0.699  0.246  0.254  1.0
  O  O7  1  0.158  0.243  0.533  1.0
  O  O8  1  0.158  0.967  0.257  1.0
  O  O9  1  0.810  0.048  0.743  1.0
  O  O10  1  0.819  0.459  0.765  1.0
  O  O11  1  0.810  0.757  0.452  1.0
  O  O12  1  0.213  0.543  0.252  1.0
  O  O13  1  0.213  0.248  0.957  1.0
  O  O14  1  0.819  0.735  0.041  1.0
[/CIF]
.
The material described by MgW2Fe2(O4Cl)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and one Cl(2) atom to form distorted MgClO4 trigonal bipyramids that share edges with two equivalent W(1)O4 tetrahedra and  an edgeedge with one Fe(2)ClO4 trigonal bipyramid. W(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form WO4 tetrahedra that share corners with two equivalent Fe(2)ClO4 trigonal bipyramids and  an edgeedge with one Mg(1)ClO4 trigonal bipyramid. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 5-coordinate geometry to two equivalent O(1), two equivalent O(4), and one Cl(2) atom. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(3), and one Cl(1) atom to form distorted FeClO4 trigonal bipyramids that share corners with four equivalent W(1)O4 tetrahedra and  an edgeedge with one Mg(1)ClO4 trigonal bipyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Fe(1) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one W(1) and one Fe(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a single-bond geometry to one Fe(2) atom. In the second Cl site, Cl(2) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Fe(1) atom. is represented by the CIF file [CIF]
data_MgFe2W2(ClO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.458
_cell_length_b   7.193
_cell_length_c   7.193
_cell_angle_alpha   87.189
_cell_angle_beta   88.913
_cell_angle_gamma   91.087
_symmetry_Int_Tables_number   1
_cell_volume   281.978
_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  0.894  0.035  0.465  1.0
  Fe  Fe1  1  0.256  0.264  0.236  1.0
  Fe  Fe2  1  0.726  0.736  0.764  1.0
  W  W3  1  0.008  0.259  0.763  1.0
  W  W4  1  0.008  0.737  0.241  1.0
  Cl  Cl5  1  0.302  0.768  0.732  1.0
  Cl  Cl6  1  0.699  0.246  0.254  1.0
  O  O7  1  0.158  0.243  0.533  1.0
  O  O8  1  0.158  0.967  0.257  1.0
  O  O9  1  0.810  0.048  0.743  1.0
  O  O10  1  0.819  0.459  0.765  1.0
  O  O11  1  0.810  0.757  0.452  1.0
  O  O12  1  0.213  0.543  0.252  1.0
  O  O13  1  0.213  0.248  0.957  1.0
  O  O14  1  0.819  0.735  0.041  1.0
[/CIF]
.