The structure described by Mg3Fe2H4(Se3O10)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-65°. In the second Mg site, Mg(2) is bonded to one O(1), one O(10), one O(3), one O(7), one O(8), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 65°. Fe(1) is bonded to one O(10), one O(4), one O(5), one O(7), and two equivalent O(6) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(8) and one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) and one O(9) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(7) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(5), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(10) is bonded in a trigonal planar geometry to one Mg(2), one Fe(1), and one Se(3) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one Mg(2), and one Se(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Se(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(2) and one Se(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one H(2), and one Se(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Fe(1), and one Se(3) atom. In the seventh O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Se(2) atom. In the eighth O site, O(7) is bonded in a trigonal planar geometry to one Mg(2), one Fe(1), and one Se(2) atom. In the ninth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(2), one H(1), and one Se(3) atom. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mg(2), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_Mg3Fe2H4(Se3O10)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.505
_cell_length_b   7.989
_cell_length_c   8.753
_cell_angle_alpha   85.780
_cell_angle_beta   79.056
_cell_angle_gamma   76.461
_symmetry_Int_Tables_number   1
_cell_volume   433.945
_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  0.500  0.000  0.000  1.0
  Mg  Mg1  1  0.310  0.675  0.270  1.0
  Mg  Mg2  1  0.690  0.325  0.730  1.0
  Fe  Fe3  1  0.136  0.396  0.120  1.0
  Fe  Fe4  1  0.864  0.604  0.880  1.0
  H  H5  1  0.320  0.468  0.548  1.0
  H  H6  1  0.680  0.532  0.452  1.0
  H  H7  1  0.134  0.635  0.563  1.0
  H  H8  1  0.866  0.365  0.437  1.0
  Se  Se9  1  0.238  0.075  0.374  1.0
  Se  Se10  1  0.762  0.925  0.626  1.0
  Se  Se11  1  0.668  0.292  0.134  1.0
  Se  Se12  1  0.332  0.708  0.866  1.0
  Se  Se13  1  0.201  0.215  0.772  1.0
  Se  Se14  1  0.799  0.785  0.228  1.0
  O  O15  1  0.332  0.797  0.036  1.0
  O  O16  1  0.668  0.203  0.964  1.0
  O  O17  1  0.453  0.054  0.226  1.0
  O  O18  1  0.547  0.946  0.774  1.0
  O  O19  1  0.135  0.907  0.353  1.0
  O  O20  1  0.865  0.093  0.647  1.0
  O  O21  1  0.065  0.248  0.297  1.0
  O  O22  1  0.935  0.752  0.703  1.0
  O  O23  1  0.230  0.203  0.968  1.0
  O  O24  1  0.770  0.797  0.032  1.0
  O  O25  1  0.831  0.439  0.072  1.0
  O  O26  1  0.169  0.561  0.928  1.0
  O  O27  1  0.417  0.432  0.164  1.0
  O  O28  1  0.583  0.568  0.836  1.0
  O  O29  1  0.398  0.312  0.686  1.0
  O  O30  1  0.602  0.688  0.314  1.0
  O  O31  1  0.259  0.573  0.491  1.0
  O  O32  1  0.741  0.427  0.509  1.0
  O  O33  1  0.023  0.619  0.236  1.0
  O  O34  1  0.977  0.381  0.764  1.0
[/CIF]
.
The structure described by Mg3Fe2H4(Se3O10)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Mg(2)O6 octahedra and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 62-65°. In the second Mg site, Mg(2) is bonded to one O(1), one O(10), one O(3), one O(7), one O(8), and one O(9) atom to form MgO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 65°. Fe(1) is bonded to one O(10), one O(4), one O(5), one O(7), and two equivalent O(6) atoms to form FeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra,  an edgeedge with one Mg(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(8) and one O(9) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) and one O(9) atom. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(7) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(5), and one O(8) atom. There are ten inequivalent O sites. In the first O site, O(10) is bonded in a trigonal planar geometry to one Mg(2), one Fe(1), and one Se(3) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one Mg(1), one Mg(2), and one Se(2) atom. In the third O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one Se(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Mg(2) and one Se(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Fe(1), one H(2), and one Se(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1), one Fe(1), and one Se(3) atom. In the seventh O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Fe(1) and one Se(2) atom. In the eighth O site, O(7) is bonded in a trigonal planar geometry to one Mg(2), one Fe(1), and one Se(2) atom. In the ninth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(2), one H(1), and one Se(3) atom. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mg(2), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_Mg3Fe2H4(Se3O10)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.505
_cell_length_b   7.989
_cell_length_c   8.753
_cell_angle_alpha   85.780
_cell_angle_beta   79.056
_cell_angle_gamma   76.461
_symmetry_Int_Tables_number   1
_cell_volume   433.945
_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  0.500  0.000  0.000  1.0
  Mg  Mg1  1  0.310  0.675  0.270  1.0
  Mg  Mg2  1  0.690  0.325  0.730  1.0
  Fe  Fe3  1  0.136  0.396  0.120  1.0
  Fe  Fe4  1  0.864  0.604  0.880  1.0
  H  H5  1  0.320  0.468  0.548  1.0
  H  H6  1  0.680  0.532  0.452  1.0
  H  H7  1  0.134  0.635  0.563  1.0
  H  H8  1  0.866  0.365  0.437  1.0
  Se  Se9  1  0.238  0.075  0.374  1.0
  Se  Se10  1  0.762  0.925  0.626  1.0
  Se  Se11  1  0.668  0.292  0.134  1.0
  Se  Se12  1  0.332  0.708  0.866  1.0
  Se  Se13  1  0.201  0.215  0.772  1.0
  Se  Se14  1  0.799  0.785  0.228  1.0
  O  O15  1  0.332  0.797  0.036  1.0
  O  O16  1  0.668  0.203  0.964  1.0
  O  O17  1  0.453  0.054  0.226  1.0
  O  O18  1  0.547  0.946  0.774  1.0
  O  O19  1  0.135  0.907  0.353  1.0
  O  O20  1  0.865  0.093  0.647  1.0
  O  O21  1  0.065  0.248  0.297  1.0
  O  O22  1  0.935  0.752  0.703  1.0
  O  O23  1  0.230  0.203  0.968  1.0
  O  O24  1  0.770  0.797  0.032  1.0
  O  O25  1  0.831  0.439  0.072  1.0
  O  O26  1  0.169  0.561  0.928  1.0
  O  O27  1  0.417  0.432  0.164  1.0
  O  O28  1  0.583  0.568  0.836  1.0
  O  O29  1  0.398  0.312  0.686  1.0
  O  O30  1  0.602  0.688  0.314  1.0
  O  O31  1  0.259  0.573  0.491  1.0
  O  O32  1  0.741  0.427  0.509  1.0
  O  O33  1  0.023  0.619  0.236  1.0
  O  O34  1  0.977  0.381  0.764  1.0
[/CIF]
.