The crystal structure described by Rb5FeO4 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted RbO4 trigonal pyramids that share corners with two equivalent Fe(1)O4 tetrahedra and  an edgeedge with one Fe(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), and two equivalent O(2) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with two equivalent Rb(1)O4 trigonal pyramids and  an edgeedge with one Rb(1)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Rb(5), and one Fe(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), one Rb(5), two equivalent Rb(3), and one Fe(1) atom. In the third O site, O(3) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(5), two equivalent Rb(4), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(4), one Rb(5), two equivalent Rb(2), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Rb5FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.971
_cell_length_b   7.623
_cell_length_c   13.662
_cell_angle_alpha   58.457
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   973.700
_cell_formula_units_Z   4
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  0.336  0.636  0.262  1.0
  Rb  Rb1  1  0.353  0.901  0.886  1.0
  Rb  Rb2  1  0.601  0.253  0.445  1.0
  Rb  Rb3  1  0.092  0.355  0.446  1.0
  Rb  Rb4  1  0.338  0.154  0.607  1.0
  Rb  Rb5  1  0.592  0.645  0.054  1.0
  Rb  Rb6  1  0.101  0.747  0.055  1.0
  Rb  Rb7  1  0.838  0.846  0.893  1.0
  Rb  Rb8  1  0.853  0.099  0.614  1.0
  Rb  Rb9  1  0.836  0.364  0.238  1.0
  Rb  Rb10  1  0.164  0.636  0.762  1.0
  Rb  Rb11  1  0.147  0.901  0.386  1.0
  Rb  Rb12  1  0.162  0.154  0.107  1.0
  Rb  Rb13  1  0.899  0.253  0.945  1.0
  Rb  Rb14  1  0.408  0.355  0.946  1.0
  Rb  Rb15  1  0.662  0.846  0.393  1.0
  Rb  Rb16  1  0.908  0.645  0.554  1.0
  Rb  Rb17  1  0.399  0.747  0.555  1.0
  Rb  Rb18  1  0.647  0.099  0.114  1.0
  Rb  Rb19  1  0.664  0.364  0.738  1.0
  Fe  Fe20  1  0.089  0.239  0.740  1.0
  Fe  Fe21  1  0.411  0.239  0.240  1.0
  Fe  Fe22  1  0.589  0.761  0.760  1.0
  Fe  Fe23  1  0.911  0.761  0.260  1.0
  O  O24  1  0.086  0.733  0.252  1.0
  O  O25  1  0.157  0.182  0.887  1.0
  O  O26  1  0.844  0.503  0.392  1.0
  O  O27  1  0.111  0.027  0.707  1.0
  O  O28  1  0.344  0.497  0.108  1.0
  O  O29  1  0.611  0.973  0.793  1.0
  O  O30  1  0.586  0.267  0.248  1.0
  O  O31  1  0.657  0.818  0.613  1.0
  O  O32  1  0.343  0.182  0.387  1.0
  O  O33  1  0.414  0.733  0.752  1.0
  O  O34  1  0.389  0.027  0.207  1.0
  O  O35  1  0.656  0.503  0.892  1.0
  O  O36  1  0.889  0.973  0.293  1.0
  O  O37  1  0.156  0.497  0.608  1.0
  O  O38  1  0.843  0.818  0.113  1.0
  O  O39  1  0.914  0.267  0.748  1.0
[/CIF]
.
The crystal structure described by Rb5FeO4 crystallizes in the monoclinic P2_1/c space group. There are five inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted RbO4 trigonal pyramids that share corners with two equivalent Fe(1)O4 tetrahedra and  an edgeedge with one Fe(1)O4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), and two equivalent O(2) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. In the fifth Rb site, Rb(5) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(4) atom. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with two equivalent Rb(1)O4 trigonal pyramids and  an edgeedge with one Rb(1)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Rb(5), and one Fe(1) atom. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(4), one Rb(5), two equivalent Rb(3), and one Fe(1) atom. In the third O site, O(3) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(5), two equivalent Rb(4), and one Fe(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Rb(1), one Rb(4), one Rb(5), two equivalent Rb(2), and one Fe(1) atom. is represented by the CIF card [CIF]
data_Rb5FeO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.971
_cell_length_b   7.623
_cell_length_c   13.662
_cell_angle_alpha   58.457
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   973.700
_cell_formula_units_Z   4
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  0.336  0.636  0.262  1.0
  Rb  Rb1  1  0.353  0.901  0.886  1.0
  Rb  Rb2  1  0.601  0.253  0.445  1.0
  Rb  Rb3  1  0.092  0.355  0.446  1.0
  Rb  Rb4  1  0.338  0.154  0.607  1.0
  Rb  Rb5  1  0.592  0.645  0.054  1.0
  Rb  Rb6  1  0.101  0.747  0.055  1.0
  Rb  Rb7  1  0.838  0.846  0.893  1.0
  Rb  Rb8  1  0.853  0.099  0.614  1.0
  Rb  Rb9  1  0.836  0.364  0.238  1.0
  Rb  Rb10  1  0.164  0.636  0.762  1.0
  Rb  Rb11  1  0.147  0.901  0.386  1.0
  Rb  Rb12  1  0.162  0.154  0.107  1.0
  Rb  Rb13  1  0.899  0.253  0.945  1.0
  Rb  Rb14  1  0.408  0.355  0.946  1.0
  Rb  Rb15  1  0.662  0.846  0.393  1.0
  Rb  Rb16  1  0.908  0.645  0.554  1.0
  Rb  Rb17  1  0.399  0.747  0.555  1.0
  Rb  Rb18  1  0.647  0.099  0.114  1.0
  Rb  Rb19  1  0.664  0.364  0.738  1.0
  Fe  Fe20  1  0.089  0.239  0.740  1.0
  Fe  Fe21  1  0.411  0.239  0.240  1.0
  Fe  Fe22  1  0.589  0.761  0.760  1.0
  Fe  Fe23  1  0.911  0.761  0.260  1.0
  O  O24  1  0.086  0.733  0.252  1.0
  O  O25  1  0.157  0.182  0.887  1.0
  O  O26  1  0.844  0.503  0.392  1.0
  O  O27  1  0.111  0.027  0.707  1.0
  O  O28  1  0.344  0.497  0.108  1.0
  O  O29  1  0.611  0.973  0.793  1.0
  O  O30  1  0.586  0.267  0.248  1.0
  O  O31  1  0.657  0.818  0.613  1.0
  O  O32  1  0.343  0.182  0.387  1.0
  O  O33  1  0.414  0.733  0.752  1.0
  O  O34  1  0.389  0.027  0.207  1.0
  O  O35  1  0.656  0.503  0.892  1.0
  O  O36  1  0.889  0.973  0.293  1.0
  O  O37  1  0.156  0.497  0.608  1.0
  O  O38  1  0.843  0.818  0.113  1.0
  O  O39  1  0.914  0.267  0.748  1.0
[/CIF]
.