The material structure described by RbMgMn4O8 crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(7), and two equivalent O(1) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), two equivalent O(6), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mn(3)O5 square pyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(5) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-63°. In the third Mn site, Mn(3) is bonded to one O(6), two equivalent O(4), and two equivalent O(8) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 50-52°. In the fourth Mn site, Mn(4) is bonded to one O(7), one O(8), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mn(3)O5 square pyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Mn(2) atoms to form distorted OMg2Mn3 trigonal bipyramids that share  a cornercorner with one O(2)Rb2Mn3 square pyramid, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(1)Mg2Mn3 trigonal bipyramids, and edges with two equivalent O(7)MgMn3 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Rb(1), one Mn(1), and two equivalent Mn(4) atoms to form distorted ORb2Mn3 square pyramids that share  a cornercorner with one O(1)Mg2Mn3 trigonal bipyramid, edges with two equivalent O(2)Rb2Mn3 square pyramids, edges with two equivalent O(7)MgMn3 trigonal pyramids, and edges with two equivalent O(6)RbMn3 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(4) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Mg(1), and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Rb(1) and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded to one Rb(1), one Mn(3), and two equivalent Mn(1) atoms to form distorted ORbMn3 trigonal pyramids that share corners with two equivalent O(1)Mg2Mn3 trigonal bipyramids, corners with two equivalent O(7)MgMn3 trigonal pyramids, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(2)Rb2Mn3 square pyramids, and  an edgeedge with one O(7)MgMn3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Mg(1), one Mn(4), and two equivalent Mn(1) atoms to form OMgMn3 trigonal pyramids that share corners with two equivalent O(7)MgMn3 trigonal pyramids, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(2)Rb2Mn3 square pyramids, edges with two equivalent O(1)Mg2Mn3 trigonal bipyramids, and  an edgeedge with one O(6)RbMn3 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(4) and two equivalent Mn(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbMgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.536
_cell_length_b   7.678
_cell_length_c   8.536
_cell_angle_alpha   104.356
_cell_angle_beta   160.058
_cell_angle_gamma   79.555
_symmetry_Int_Tables_number   1
_cell_volume   182.580
_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  0.423  0.958  0.535  1.0
  Mg  Mg1  1  0.212  0.254  0.042  1.0
  Mn  Mn2  1  0.837  0.175  0.338  1.0
  Mn  Mn3  1  0.411  0.603  0.192  1.0
  Mn  Mn4  1  0.606  0.423  0.817  1.0
  Mn  Mn5  1  0.163  0.800  0.636  1.0
  O  O6  1  0.823  0.399  0.576  1.0
  O  O7  1  0.765  0.897  0.133  1.0
  O  O8  1  0.566  0.712  0.146  1.0
  O  O9  1  0.112  0.292  0.180  1.0
  O  O10  1  0.931  0.744  0.813  1.0
  O  O11  1  0.437  0.264  0.828  1.0
  O  O12  1  0.224  0.069  0.844  1.0
  O  O13  1  0.149  0.587  0.438  1.0
[/CIF]
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The material structure described by RbMgMn4O8 crystallizes in the monoclinic Cm space group. Rb(1) is bonded in a 7-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Mg(1) is bonded in a rectangular see-saw-like geometry to one O(4), one O(7), and two equivalent O(1) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), two equivalent O(6), and two equivalent O(7) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mn(3)O5 square pyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(3), two equivalent O(1), and two equivalent O(5) atoms to form distorted MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 51-63°. In the third Mn site, Mn(3) is bonded to one O(6), two equivalent O(4), and two equivalent O(8) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and edges with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 50-52°. In the fourth Mn site, Mn(4) is bonded to one O(7), one O(8), two equivalent O(2), and two equivalent O(3) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O5 square pyramids, corners with two equivalent Mn(3)O5 square pyramids, edges with two equivalent Mn(1)O6 octahedra, and edges with two equivalent Mn(4)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1), one Mn(1), and two equivalent Mn(2) atoms to form distorted OMg2Mn3 trigonal bipyramids that share  a cornercorner with one O(2)Rb2Mn3 square pyramid, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(1)Mg2Mn3 trigonal bipyramids, and edges with two equivalent O(7)MgMn3 trigonal pyramids. In the second O site, O(2) is bonded to two equivalent Rb(1), one Mn(1), and two equivalent Mn(4) atoms to form distorted ORb2Mn3 square pyramids that share  a cornercorner with one O(1)Mg2Mn3 trigonal bipyramid, edges with two equivalent O(2)Rb2Mn3 square pyramids, edges with two equivalent O(7)MgMn3 trigonal pyramids, and edges with two equivalent O(6)RbMn3 trigonal pyramids. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(4) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Rb(1), one Mg(1), and two equivalent Mn(3) atoms. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Rb(1) and two equivalent Mn(2) atoms. In the sixth O site, O(6) is bonded to one Rb(1), one Mn(3), and two equivalent Mn(1) atoms to form distorted ORbMn3 trigonal pyramids that share corners with two equivalent O(1)Mg2Mn3 trigonal bipyramids, corners with two equivalent O(7)MgMn3 trigonal pyramids, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(2)Rb2Mn3 square pyramids, and  an edgeedge with one O(7)MgMn3 trigonal pyramid. In the seventh O site, O(7) is bonded to one Mg(1), one Mn(4), and two equivalent Mn(1) atoms to form OMgMn3 trigonal pyramids that share corners with two equivalent O(7)MgMn3 trigonal pyramids, corners with two equivalent O(6)RbMn3 trigonal pyramids, edges with two equivalent O(2)Rb2Mn3 square pyramids, edges with two equivalent O(1)Mg2Mn3 trigonal bipyramids, and  an edgeedge with one O(6)RbMn3 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(4) and two equivalent Mn(3) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbMgMn4O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.536
_cell_length_b   7.678
_cell_length_c   8.536
_cell_angle_alpha   104.356
_cell_angle_beta   160.058
_cell_angle_gamma   79.555
_symmetry_Int_Tables_number   1
_cell_volume   182.580
_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  0.423  0.958  0.535  1.0
  Mg  Mg1  1  0.212  0.254  0.042  1.0
  Mn  Mn2  1  0.837  0.175  0.338  1.0
  Mn  Mn3  1  0.411  0.603  0.192  1.0
  Mn  Mn4  1  0.606  0.423  0.817  1.0
  Mn  Mn5  1  0.163  0.800  0.636  1.0
  O  O6  1  0.823  0.399  0.576  1.0
  O  O7  1  0.765  0.897  0.133  1.0
  O  O8  1  0.566  0.712  0.146  1.0
  O  O9  1  0.112  0.292  0.180  1.0
  O  O10  1  0.931  0.744  0.813  1.0
  O  O11  1  0.437  0.264  0.828  1.0
  O  O12  1  0.224  0.069  0.844  1.0
  O  O13  1  0.149  0.587  0.438  1.0
[/CIF]
.