The structure described by MgMn8(OF)8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(5), one F(5), one F(7), and one F(8) atom to form distorted MgO3F3 octahedra that share corners with two equivalent Mn(1)O3F3 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with two equivalent Mn(4)O3F trigonal pyramids, edges with two equivalent Mn(5)O3F3 octahedra, edges with two equivalent Mn(8)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 39-51°. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(6), one O(8), one F(1), one F(2), and one F(8) atom to form distorted MnO3F3 octahedra that share corners with two equivalent Mg(1)O3F3 octahedra, corners with four equivalent Mn(6)O3F3 octahedra, corners with four equivalent Mn(8)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid, and  an edgeedge with one Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 38-61°. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(8), one F(1), one F(4), and one F(6) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. In the third Mn site, Mn(3) is bonded to one O(1), one O(2), one O(7), one F(3), one F(6), and one F(7) atom to form distorted MnO3F3 octahedra that share corners with two equivalent Mg(1)O3F3 octahedra, corners with four equivalent Mn(5)O3F3 octahedra, corners with four equivalent Mn(7)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid, and  an edgeedge with one Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 40-63°. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(3), one O(5), and one F(5) atom to form MnO3F trigonal pyramids that share  a cornercorner with one Mn(1)O3F3 octahedra,  a cornercorner with one Mn(3)O3F3 octahedra,  a cornercorner with one Mn(5)O3F3 octahedra,  a cornercorner with one Mn(8)O3F3 octahedra, corners with two equivalent Mg(1)O3F3 octahedra,  an edgeedge with one Mg(1)O3F3 octahedra,  an edgeedge with one Mn(5)O3F3 octahedra, and  an edgeedge with one Mn(8)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 17-78°. In the fifth Mn site, Mn(5) is bonded to one O(2), one O(5), one O(7), one F(3), one F(5), and one F(7) atom to form distorted MnO3F3 octahedra that share corners with four equivalent Mn(3)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid,  an edgeedge with one Mn(7)O3F3 octahedra,  an edgeedge with one Mn(8)O3F3 octahedra, edges with two equivalent Mg(1)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 40-63°. In the sixth Mn site, Mn(6) is bonded to one O(4), one O(6), one O(8), one F(1), one F(2), and one F(4) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. In the seventh Mn site, Mn(7) is bonded to one O(1), one O(4), one O(7), one F(3), one F(4), and one F(6) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-55°. In the eighth Mn site, Mn(8) is bonded to one O(3), one O(5), one O(6), one F(2), one F(5), and one F(8) atom to form distorted MnO3F3 octahedra that share corners with four equivalent Mn(1)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid,  an edgeedge with one Mn(5)O3F3 octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, edges with two equivalent Mg(1)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 38-61°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(7) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(4), and one Mn(5) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(4), and one Mn(8) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(2), one Mn(6), and one Mn(7) atom. In the fifth O site, O(5) is bonded in a tetrahedral geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(1), one Mn(6), and one Mn(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mn(3), one Mn(5), and one Mn(7) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(6) atom. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(2), and one Mn(6) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(6), and one Mn(8) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mn(3), one Mn(5), and one Mn(7) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(6), and one Mn(7) atom. In the fifth F site, F(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(7) atom. In the seventh F site, F(7) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(3), and one Mn(5) atom. In the eighth F site, F(8) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one Mn(8) atom. is represented by the CIF file [CIF]
data_MgMn8(OF)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.808
_cell_length_b   4.889
_cell_length_c   12.651
_cell_angle_alpha   90.266
_cell_angle_beta   89.883
_cell_angle_gamma   89.866
_symmetry_Int_Tables_number   1
_cell_volume   297.411
_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  0.959  0.519  0.745  1.0
  Mn  Mn1  1  0.969  0.942  0.003  1.0
  Mn  Mn2  1  0.030  0.006  0.245  1.0
  Mn  Mn3  1  0.969  0.954  0.493  1.0
  Mn  Mn4  1  0.282  0.989  0.755  1.0
  Mn  Mn5  1  0.463  0.530  0.606  1.0
  Mn  Mn6  1  0.529  0.445  0.128  1.0
  Mn  Mn7  1  0.465  0.517  0.365  1.0
  Mn  Mn8  1  0.473  0.517  0.889  1.0
  O  O9  1  0.176  0.800  0.362  1.0
  O  O10  1  0.149  0.777  0.628  1.0
  O  O11  1  0.151  0.761  0.878  1.0
  O  O12  1  0.329  0.294  0.246  1.0
  O  O13  1  0.340  0.378  0.748  1.0
  O  O14  1  0.667  0.666  0.007  1.0
  O  O15  1  0.633  0.703  0.490  1.0
  O  O16  1  0.833  0.168  0.122  1.0
  F  F17  1  0.211  0.738  0.123  1.0
  F  F18  1  0.298  0.222  0.992  1.0
  F  F19  1  0.272  0.270  0.497  1.0
  F  F20  1  0.716  0.713  0.243  1.0
  F  F21  1  0.670  0.792  0.755  1.0
  F  F22  1  0.783  0.221  0.375  1.0
  F  F23  1  0.798  0.288  0.629  1.0
  F  F24  1  0.808  0.276  0.859  1.0
[/CIF]
.
The structure described by MgMn8(OF)8 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(5), one F(5), one F(7), and one F(8) atom to form distorted MgO3F3 octahedra that share corners with two equivalent Mn(1)O3F3 octahedra, corners with two equivalent Mn(3)O3F3 octahedra, corners with two equivalent Mn(4)O3F trigonal pyramids, edges with two equivalent Mn(5)O3F3 octahedra, edges with two equivalent Mn(8)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 39-51°. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(3), one O(6), one O(8), one F(1), one F(2), and one F(8) atom to form distorted MnO3F3 octahedra that share corners with two equivalent Mg(1)O3F3 octahedra, corners with four equivalent Mn(6)O3F3 octahedra, corners with four equivalent Mn(8)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid, and  an edgeedge with one Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 38-61°. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), one O(8), one F(1), one F(4), and one F(6) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. In the third Mn site, Mn(3) is bonded to one O(1), one O(2), one O(7), one F(3), one F(6), and one F(7) atom to form distorted MnO3F3 octahedra that share corners with two equivalent Mg(1)O3F3 octahedra, corners with four equivalent Mn(5)O3F3 octahedra, corners with four equivalent Mn(7)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid, and  an edgeedge with one Mn(2)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 40-63°. In the fourth Mn site, Mn(4) is bonded to one O(2), one O(3), one O(5), and one F(5) atom to form MnO3F trigonal pyramids that share  a cornercorner with one Mn(1)O3F3 octahedra,  a cornercorner with one Mn(3)O3F3 octahedra,  a cornercorner with one Mn(5)O3F3 octahedra,  a cornercorner with one Mn(8)O3F3 octahedra, corners with two equivalent Mg(1)O3F3 octahedra,  an edgeedge with one Mg(1)O3F3 octahedra,  an edgeedge with one Mn(5)O3F3 octahedra, and  an edgeedge with one Mn(8)O3F3 octahedra. The corner-sharing octahedral tilt angles range from 17-78°. In the fifth Mn site, Mn(5) is bonded to one O(2), one O(5), one O(7), one F(3), one F(5), and one F(7) atom to form distorted MnO3F3 octahedra that share corners with four equivalent Mn(3)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid,  an edgeedge with one Mn(7)O3F3 octahedra,  an edgeedge with one Mn(8)O3F3 octahedra, edges with two equivalent Mg(1)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 40-63°. In the sixth Mn site, Mn(6) is bonded to one O(4), one O(6), one O(8), one F(1), one F(2), and one F(4) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 43-54°. In the seventh Mn site, Mn(7) is bonded to one O(1), one O(4), one O(7), one F(3), one F(4), and one F(6) atom to form a mixture of edge and corner-sharing MnO3F3 octahedra. The corner-sharing octahedral tilt angles range from 42-55°. In the eighth Mn site, Mn(8) is bonded to one O(3), one O(5), one O(6), one F(2), one F(5), and one F(8) atom to form distorted MnO3F3 octahedra that share corners with four equivalent Mn(1)O3F3 octahedra,  a cornercorner with one Mn(4)O3F trigonal pyramid,  an edgeedge with one Mn(5)O3F3 octahedra,  an edgeedge with one Mn(6)O3F3 octahedra, edges with two equivalent Mg(1)O3F3 octahedra, and  an edgeedge with one Mn(4)O3F trigonal pyramid. The corner-sharing octahedral tilt angles range from 38-61°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(7) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(3), one Mn(4), and one Mn(5) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(1), one Mn(4), and one Mn(8) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(2), one Mn(6), and one Mn(7) atom. In the fifth O site, O(5) is bonded in a tetrahedral geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Mn(1), one Mn(6), and one Mn(8) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mn(3), one Mn(5), and one Mn(7) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(6) atom. There are eight inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(2), and one Mn(6) atom. In the second F site, F(2) is bonded in a distorted T-shaped geometry to one Mn(1), one Mn(6), and one Mn(8) atom. In the third F site, F(3) is bonded in a distorted T-shaped geometry to one Mn(3), one Mn(5), and one Mn(7) atom. In the fourth F site, F(4) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(6), and one Mn(7) atom. In the fifth F site, F(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one Mn(4), one Mn(5), and one Mn(8) atom. In the sixth F site, F(6) is bonded in a distorted T-shaped geometry to one Mn(2), one Mn(3), and one Mn(7) atom. In the seventh F site, F(7) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(3), and one Mn(5) atom. In the eighth F site, F(8) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one Mn(8) atom. is represented by the CIF file [CIF]
data_MgMn8(OF)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.808
_cell_length_b   4.889
_cell_length_c   12.651
_cell_angle_alpha   90.266
_cell_angle_beta   89.883
_cell_angle_gamma   89.866
_symmetry_Int_Tables_number   1
_cell_volume   297.411
_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  0.959  0.519  0.745  1.0
  Mn  Mn1  1  0.969  0.942  0.003  1.0
  Mn  Mn2  1  0.030  0.006  0.245  1.0
  Mn  Mn3  1  0.969  0.954  0.493  1.0
  Mn  Mn4  1  0.282  0.989  0.755  1.0
  Mn  Mn5  1  0.463  0.530  0.606  1.0
  Mn  Mn6  1  0.529  0.445  0.128  1.0
  Mn  Mn7  1  0.465  0.517  0.365  1.0
  Mn  Mn8  1  0.473  0.517  0.889  1.0
  O  O9  1  0.176  0.800  0.362  1.0
  O  O10  1  0.149  0.777  0.628  1.0
  O  O11  1  0.151  0.761  0.878  1.0
  O  O12  1  0.329  0.294  0.246  1.0
  O  O13  1  0.340  0.378  0.748  1.0
  O  O14  1  0.667  0.666  0.007  1.0
  O  O15  1  0.633  0.703  0.490  1.0
  O  O16  1  0.833  0.168  0.122  1.0
  F  F17  1  0.211  0.738  0.123  1.0
  F  F18  1  0.298  0.222  0.992  1.0
  F  F19  1  0.272  0.270  0.497  1.0
  F  F20  1  0.716  0.713  0.243  1.0
  F  F21  1  0.670  0.792  0.755  1.0
  F  F22  1  0.783  0.221  0.375  1.0
  F  F23  1  0.798  0.288  0.629  1.0
  F  F24  1  0.808  0.276  0.859  1.0
[/CIF]
.