The crystal structure described by MnFe7(PO4)8 crystallizes in the monoclinic Pm space group. Mn(1) is bonded to one O(19), one O(6), two equivalent O(13), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with four equivalent Fe(4)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-50°. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(20), one O(7), two equivalent O(14), and two equivalent O(2) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(4)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second Fe site, Fe(2) is bonded to one O(12), one O(5), two equivalent O(18), and two equivalent O(8) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(5)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the third Fe site, Fe(3) is bonded to one O(11), one O(4), two equivalent O(17), and two equivalent O(9) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(5)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(13), one O(14), one O(16), one O(2), and one O(3) atom to form distorted FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(15), one O(17), one O(18), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-49°. There are six inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(16), one O(2), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-56°. In the second P site, P(2) is bonded to one O(10), one O(15), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-56°. In the third P site, P(3) is bonded to one O(12), one O(7), and two equivalent O(14) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. In the fourth P site, P(4) is bonded to one O(11), one O(6), and two equivalent O(13) atoms to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-53°. In the fifth P site, P(5) is bonded to one O(19), one O(4), and two equivalent O(17) atoms to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the sixth P site, P(6) is bonded to one O(20), one O(5), and two equivalent O(18) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-56°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(5) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one Fe(4), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(3) and one P(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(6) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one P(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(4), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Fe(5) and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Fe(4) and one P(1) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one P(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one P(6) atom. In the nineteenth O site, O(19) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(5) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MnFe7(PO4)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.913
_cell_length_b   4.890
_cell_length_c   9.936
_cell_angle_alpha   89.770
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   578.843
_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
  Mn  Mn0  1  0.500  0.939  0.718  1.0
  Fe  Fe1  1  0.000  0.970  0.728  1.0
  Fe  Fe2  1  0.000  0.532  0.227  1.0
  Fe  Fe3  1  0.500  0.531  0.227  1.0
  Fe  Fe4  1  0.251  0.466  0.775  1.0
  Fe  Fe5  1  0.749  0.466  0.775  1.0
  Fe  Fe6  1  0.250  0.031  0.273  1.0
  Fe  Fe7  1  0.750  0.031  0.273  1.0
  P  P8  1  0.248  0.919  0.597  1.0
  P  P9  1  0.752  0.919  0.597  1.0
  P  P10  1  0.250  0.583  0.097  1.0
  P  P11  1  0.750  0.583  0.097  1.0
  P  P12  1  0.000  0.418  0.904  1.0
  P  P13  1  0.500  0.419  0.900  1.0
  P  P14  1  0.500  0.079  0.404  1.0
  P  P15  1  0.000  0.081  0.403  1.0
  O  O16  1  0.249  0.850  0.447  1.0
  O  O17  1  0.751  0.850  0.447  1.0
  O  O18  1  0.148  0.774  0.671  1.0
  O  O19  1  0.652  0.771  0.672  1.0
  O  O20  1  0.852  0.774  0.671  1.0
  O  O21  1  0.348  0.771  0.672  1.0
  O  O22  1  0.500  0.770  0.383  1.0
  O  O23  1  0.000  0.772  0.381  1.0
  O  O24  1  0.500  0.734  0.880  1.0
  O  O25  1  0.000  0.727  0.882  1.0
  O  O26  1  0.149  0.727  0.172  1.0
  O  O27  1  0.351  0.727  0.172  1.0
  O  O28  1  0.851  0.727  0.172  1.0
  O  O29  1  0.649  0.727  0.172  1.0
  O  O30  1  0.249  0.654  0.947  1.0
  O  O31  1  0.751  0.654  0.947  1.0
  O  O32  1  0.500  0.359  0.052  1.0
  O  O33  1  0.000  0.349  0.054  1.0
  O  O34  1  0.398  0.282  0.828  1.0
  O  O35  1  0.602  0.282  0.828  1.0
  O  O36  1  0.899  0.274  0.829  1.0
  O  O37  1  0.101  0.274  0.829  1.0
  O  O38  1  0.251  0.274  0.119  1.0
  O  O39  1  0.749  0.274  0.119  1.0
  O  O40  1  0.249  0.228  0.619  1.0
  O  O41  1  0.751  0.228  0.619  1.0
  O  O42  1  0.399  0.225  0.330  1.0
  O  O43  1  0.601  0.225  0.330  1.0
  O  O44  1  0.899  0.226  0.328  1.0
  O  O45  1  0.101  0.226  0.328  1.0
  O  O46  1  0.500  0.149  0.555  1.0
  O  O47  1  0.000  0.150  0.553  1.0
[/CIF]
.
The crystal structure described by MnFe7(PO4)8 crystallizes in the monoclinic Pm space group. Mn(1) is bonded to one O(19), one O(6), two equivalent O(13), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with four equivalent Fe(4)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-50°. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(20), one O(7), two equivalent O(14), and two equivalent O(2) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(4)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second Fe site, Fe(2) is bonded to one O(12), one O(5), two equivalent O(18), and two equivalent O(8) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(5)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the third Fe site, Fe(3) is bonded to one O(11), one O(4), two equivalent O(17), and two equivalent O(9) atoms to form distorted FeO6 octahedra that share corners with four equivalent Fe(5)O6 octahedra,  a cornercorner with one P(4)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-49°. In the fourth Fe site, Fe(4) is bonded to one O(10), one O(13), one O(14), one O(16), one O(2), and one O(3) atom to form distorted FeO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-50°. In the fifth Fe site, Fe(5) is bonded to one O(1), one O(15), one O(17), one O(18), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share corners with two equivalent Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(5)O4 tetrahedra,  a cornercorner with one P(6)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-49°. There are six inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(16), one O(2), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-56°. In the second P site, P(2) is bonded to one O(10), one O(15), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra,  a cornercorner with one Fe(5)O6 octahedra, and  an edgeedge with one Fe(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-56°. In the third P site, P(3) is bonded to one O(12), one O(7), and two equivalent O(14) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-55°. In the fourth P site, P(4) is bonded to one O(11), one O(6), and two equivalent O(13) atoms to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-53°. In the fifth P site, P(5) is bonded to one O(19), one O(4), and two equivalent O(17) atoms to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the sixth P site, P(6) is bonded to one O(20), one O(5), and two equivalent O(18) atoms to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(5)O6 octahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-56°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(5) and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(1), one Fe(4), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Fe(3) and one P(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one P(6) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one P(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Fe(4) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(3) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(4), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(4), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Fe(5) and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Fe(4) and one P(1) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(5), and one P(5) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(5), and one P(6) atom. In the nineteenth O site, O(19) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(5) atom. In the twentieth O site, O(20) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MnFe7(PO4)8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.913
_cell_length_b   4.890
_cell_length_c   9.936
_cell_angle_alpha   89.770
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   578.843
_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
  Mn  Mn0  1  0.500  0.939  0.718  1.0
  Fe  Fe1  1  0.000  0.970  0.728  1.0
  Fe  Fe2  1  0.000  0.532  0.227  1.0
  Fe  Fe3  1  0.500  0.531  0.227  1.0
  Fe  Fe4  1  0.251  0.466  0.775  1.0
  Fe  Fe5  1  0.749  0.466  0.775  1.0
  Fe  Fe6  1  0.250  0.031  0.273  1.0
  Fe  Fe7  1  0.750  0.031  0.273  1.0
  P  P8  1  0.248  0.919  0.597  1.0
  P  P9  1  0.752  0.919  0.597  1.0
  P  P10  1  0.250  0.583  0.097  1.0
  P  P11  1  0.750  0.583  0.097  1.0
  P  P12  1  0.000  0.418  0.904  1.0
  P  P13  1  0.500  0.419  0.900  1.0
  P  P14  1  0.500  0.079  0.404  1.0
  P  P15  1  0.000  0.081  0.403  1.0
  O  O16  1  0.249  0.850  0.447  1.0
  O  O17  1  0.751  0.850  0.447  1.0
  O  O18  1  0.148  0.774  0.671  1.0
  O  O19  1  0.652  0.771  0.672  1.0
  O  O20  1  0.852  0.774  0.671  1.0
  O  O21  1  0.348  0.771  0.672  1.0
  O  O22  1  0.500  0.770  0.383  1.0
  O  O23  1  0.000  0.772  0.381  1.0
  O  O24  1  0.500  0.734  0.880  1.0
  O  O25  1  0.000  0.727  0.882  1.0
  O  O26  1  0.149  0.727  0.172  1.0
  O  O27  1  0.351  0.727  0.172  1.0
  O  O28  1  0.851  0.727  0.172  1.0
  O  O29  1  0.649  0.727  0.172  1.0
  O  O30  1  0.249  0.654  0.947  1.0
  O  O31  1  0.751  0.654  0.947  1.0
  O  O32  1  0.500  0.359  0.052  1.0
  O  O33  1  0.000  0.349  0.054  1.0
  O  O34  1  0.398  0.282  0.828  1.0
  O  O35  1  0.602  0.282  0.828  1.0
  O  O36  1  0.899  0.274  0.829  1.0
  O  O37  1  0.101  0.274  0.829  1.0
  O  O38  1  0.251  0.274  0.119  1.0
  O  O39  1  0.749  0.274  0.119  1.0
  O  O40  1  0.249  0.228  0.619  1.0
  O  O41  1  0.751  0.228  0.619  1.0
  O  O42  1  0.399  0.225  0.330  1.0
  O  O43  1  0.601  0.225  0.330  1.0
  O  O44  1  0.899  0.226  0.328  1.0
  O  O45  1  0.101  0.226  0.328  1.0
  O  O46  1  0.500  0.149  0.555  1.0
  O  O47  1  0.000  0.150  0.553  1.0
[/CIF]
.