The material described by Rb8Mg(FeO4)2 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(8) atom. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and one O(7) atom. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(1), one O(6), and one O(7) atom. In the fourth Rb site, Rb(4) is bonded in a 4-coordinate geometry to one O(2), one O(6), one O(7), and one O(8) atom. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(7) atom. In the sixth Rb site, Rb(6) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(6), and one O(8) atom. In the seventh Rb site, Rb(7) is bonded in a 4-coordinate geometry to one O(4), one O(6), one O(7), and one O(8) atom. In the eighth Rb site, Rb(8) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(6), and one O(8) atom. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with three equivalent Fe(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form FeO4 tetrahedra that share corners with three equivalent Mg(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Rb(6), one Rb(8), and one Fe(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(2), one Rb(4), one Rb(6), one Mg(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(5), one Rb(8), one Mg(1), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(5), one Rb(7), one Mg(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Rb(5), one Mg(1), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(3), one Rb(4), one Rb(6), one Rb(7), one Rb(8), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a distorted octahedral geometry to one Rb(2), one Rb(3), one Rb(4), one Rb(5), one Rb(7), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(4), one Rb(6), one Rb(7), one Rb(8), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Rb8Mg(FeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.791
_cell_length_b   6.664
_cell_length_c   10.384
_cell_angle_alpha   70.709
_cell_angle_beta   85.425
_cell_angle_gamma   63.532
_symmetry_Int_Tables_number   1
_cell_volume   395.822
_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
  Rb  Rb0  1  0.269  0.772  0.038  1.0
  Rb  Rb1  1  0.203  0.464  0.460  1.0
  Rb  Rb2  1  0.300  0.285  0.831  1.0
  Rb  Rb3  1  0.188  0.943  0.618  1.0
  Rb  Rb4  1  0.758  0.903  0.398  1.0
  Rb  Rb5  1  0.824  0.666  0.073  1.0
  Rb  Rb6  1  0.711  0.461  0.679  1.0
  Rb  Rb7  1  0.735  0.254  0.032  1.0
  Mg  Mg8  1  0.639  0.406  0.370  1.0
  Fe  Fe9  1  0.252  0.131  0.253  1.0
  Fe  Fe10  1  0.751  0.908  0.728  1.0
  O  O11  1  0.151  0.205  0.075  1.0
  O  O12  1  0.967  0.276  0.338  1.0
  O  O13  1  0.431  0.304  0.255  1.0
  O  O14  1  0.620  0.194  0.562  1.0
  O  O15  1  0.446  0.771  0.332  1.0
  O  O16  1  0.554  0.783  0.827  1.0
  O  O17  1  0.974  0.674  0.661  1.0
  O  O18  1  0.867  1.000  0.850  1.0
[/CIF]
.
The material described by Rb8Mg(FeO4)2 is Pb (Zr_0.50 Ti_0.48) O_3-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(8) atom. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), one O(5), and one O(7) atom. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(1), one O(6), and one O(7) atom. In the fourth Rb site, Rb(4) is bonded in a 4-coordinate geometry to one O(2), one O(6), one O(7), and one O(8) atom. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one O(3), one O(4), one O(5), and one O(7) atom. In the sixth Rb site, Rb(6) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(6), and one O(8) atom. In the seventh Rb site, Rb(7) is bonded in a 4-coordinate geometry to one O(4), one O(6), one O(7), and one O(8) atom. In the eighth Rb site, Rb(8) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(6), and one O(8) atom. Mg(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with three equivalent Fe(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form FeO4 tetrahedra that share corners with three equivalent Mg(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(4), one O(6), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(3), one Rb(6), one Rb(8), and one Fe(1) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Rb(2), one Rb(4), one Rb(6), one Mg(1), and one Fe(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(5), one Rb(8), one Mg(1), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Rb(2), one Rb(5), one Rb(7), one Mg(1), and one Fe(2) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Rb(1), one Rb(2), one Rb(5), one Mg(1), and one Fe(1) atom. In the sixth O site, O(6) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(3), one Rb(4), one Rb(6), one Rb(7), one Rb(8), and one Fe(2) atom. In the seventh O site, O(7) is bonded in a distorted octahedral geometry to one Rb(2), one Rb(3), one Rb(4), one Rb(5), one Rb(7), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(4), one Rb(6), one Rb(7), one Rb(8), and one Fe(2) atom. is represented by the CIF file [CIF]
data_Rb8Mg(FeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.791
_cell_length_b   6.664
_cell_length_c   10.384
_cell_angle_alpha   70.709
_cell_angle_beta   85.425
_cell_angle_gamma   63.532
_symmetry_Int_Tables_number   1
_cell_volume   395.822
_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
  Rb  Rb0  1  0.269  0.772  0.038  1.0
  Rb  Rb1  1  0.203  0.464  0.460  1.0
  Rb  Rb2  1  0.300  0.285  0.831  1.0
  Rb  Rb3  1  0.188  0.943  0.618  1.0
  Rb  Rb4  1  0.758  0.903  0.398  1.0
  Rb  Rb5  1  0.824  0.666  0.073  1.0
  Rb  Rb6  1  0.711  0.461  0.679  1.0
  Rb  Rb7  1  0.735  0.254  0.032  1.0
  Mg  Mg8  1  0.639  0.406  0.370  1.0
  Fe  Fe9  1  0.252  0.131  0.253  1.0
  Fe  Fe10  1  0.751  0.908  0.728  1.0
  O  O11  1  0.151  0.205  0.075  1.0
  O  O12  1  0.967  0.276  0.338  1.0
  O  O13  1  0.431  0.304  0.255  1.0
  O  O14  1  0.620  0.194  0.562  1.0
  O  O15  1  0.446  0.771  0.332  1.0
  O  O16  1  0.554  0.783  0.827  1.0
  O  O17  1  0.974  0.674  0.661  1.0
  O  O18  1  0.867  1.000  0.850  1.0
[/CIF]
.