The crystal structure described by Mn3Fe(PO4)6 crystallizes in the trigonal R3 space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the third Mn site, Mn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Fe(1) is bonded to three equivalent O(4) and three equivalent O(6) atoms to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and  a cornercorner with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-35°. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and  a cornercorner with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. There are eight inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the third O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the sixth O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(2) atom. In the seventh O site, O(8) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(1) atom. In the eighth O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mn3Fe(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.785
_cell_length_b   8.785
_cell_length_c   8.785
_cell_angle_alpha   58.156
_cell_angle_beta   58.156
_cell_angle_gamma   58.156
_symmetry_Int_Tables_number   1
_cell_volume   459.194
_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  0.145  0.145  0.145  1.0
  Mn  Mn1  1  0.355  0.355  0.355  1.0
  Mn  Mn2  1  0.646  0.646  0.646  1.0
  Fe  Fe3  1  0.857  0.857  0.857  1.0
  P  P4  1  0.036  0.750  0.463  1.0
  P  P5  1  0.463  0.036  0.750  1.0
  P  P6  1  0.750  0.463  0.036  1.0
  P  P7  1  0.254  0.532  0.966  1.0
  P  P8  1  0.532  0.966  0.254  1.0
  P  P9  1  0.966  0.254  0.532  1.0
  O  O10  1  0.140  0.278  0.509  1.0
  O  O11  1  0.278  0.509  0.140  1.0
  O  O12  1  0.060  0.926  0.278  1.0
  O  O13  1  0.509  0.140  0.278  1.0
  O  O14  1  0.221  0.576  0.433  1.0
  O  O15  1  0.013  0.773  0.634  1.0
  O  O16  1  0.278  0.060  0.926  1.0
  O  O17  1  0.433  0.221  0.576  1.0
  O  O18  1  0.576  0.433  0.221  1.0
  O  O19  1  0.229  0.359  0.988  1.0
  O  O20  1  0.082  0.713  0.941  1.0
  O  O21  1  0.359  0.988  0.229  1.0
  O  O22  1  0.634  0.013  0.773  1.0
  O  O23  1  0.926  0.278  0.060  1.0
  O  O24  1  0.773  0.634  0.013  1.0
  O  O25  1  0.430  0.556  0.782  1.0
  O  O26  1  0.556  0.782  0.430  1.0
  O  O27  1  0.713  0.941  0.082  1.0
  O  O28  1  0.988  0.229  0.359  1.0
  O  O29  1  0.782  0.430  0.556  1.0
  O  O30  1  0.485  0.862  0.726  1.0
  O  O31  1  0.941  0.082  0.713  1.0
  O  O32  1  0.726  0.485  0.862  1.0
  O  O33  1  0.862  0.726  0.485  1.0
[/CIF]
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The crystal structure described by Mn3Fe(PO4)6 crystallizes in the trigonal R3 space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to three equivalent O(2) and three equivalent O(5) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. In the third Mn site, Mn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form MnO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. Fe(1) is bonded to three equivalent O(4) and three equivalent O(6) atoms to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and  a cornercorner with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 28-35°. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, and  a cornercorner with one Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-35°. There are eight inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the third O site, O(4) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(6) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the sixth O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(2) atom. In the seventh O site, O(8) is bonded in a bent 150 degrees geometry to one Mn(3) and one P(1) atom. In the eighth O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mn3Fe(PO4)6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.785
_cell_length_b   8.785
_cell_length_c   8.785
_cell_angle_alpha   58.156
_cell_angle_beta   58.156
_cell_angle_gamma   58.156
_symmetry_Int_Tables_number   1
_cell_volume   459.194
_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  0.145  0.145  0.145  1.0
  Mn  Mn1  1  0.355  0.355  0.355  1.0
  Mn  Mn2  1  0.646  0.646  0.646  1.0
  Fe  Fe3  1  0.857  0.857  0.857  1.0
  P  P4  1  0.036  0.750  0.463  1.0
  P  P5  1  0.463  0.036  0.750  1.0
  P  P6  1  0.750  0.463  0.036  1.0
  P  P7  1  0.254  0.532  0.966  1.0
  P  P8  1  0.532  0.966  0.254  1.0
  P  P9  1  0.966  0.254  0.532  1.0
  O  O10  1  0.140  0.278  0.509  1.0
  O  O11  1  0.278  0.509  0.140  1.0
  O  O12  1  0.060  0.926  0.278  1.0
  O  O13  1  0.509  0.140  0.278  1.0
  O  O14  1  0.221  0.576  0.433  1.0
  O  O15  1  0.013  0.773  0.634  1.0
  O  O16  1  0.278  0.060  0.926  1.0
  O  O17  1  0.433  0.221  0.576  1.0
  O  O18  1  0.576  0.433  0.221  1.0
  O  O19  1  0.229  0.359  0.988  1.0
  O  O20  1  0.082  0.713  0.941  1.0
  O  O21  1  0.359  0.988  0.229  1.0
  O  O22  1  0.634  0.013  0.773  1.0
  O  O23  1  0.926  0.278  0.060  1.0
  O  O24  1  0.773  0.634  0.013  1.0
  O  O25  1  0.430  0.556  0.782  1.0
  O  O26  1  0.556  0.782  0.430  1.0
  O  O27  1  0.713  0.941  0.082  1.0
  O  O28  1  0.988  0.229  0.359  1.0
  O  O29  1  0.782  0.430  0.556  1.0
  O  O30  1  0.485  0.862  0.726  1.0
  O  O31  1  0.941  0.082  0.713  1.0
  O  O32  1  0.726  0.485  0.862  1.0
  O  O33  1  0.862  0.726  0.485  1.0
[/CIF]
.