The structure described by Na2FeMn2(PO4)3 crystallizes in the monoclinic C2 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded to two equivalent O(10), two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra,  an edgeedge with one P(4)O4 tetrahedra, and edges with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(5), one O(6), two equivalent O(3), and two equivalent O(4) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(11), one O(2), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid, and edges with two equivalent Mn(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(4) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O8 hexagonal bipyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. Fe(1) is bonded to one O(1), one O(10), one O(12), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Na(2)O8 hexagonal bipyramid,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-62°. In the second P site, P(2) is bonded to one O(10), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  an edgeedge with one Na(2)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 40-61°. In the third P site, P(3) is bonded to two equivalent O(11) and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. In the fourth P site, P(4) is bonded to two equivalent O(12) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  an edgeedge with one Na(2)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(3), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Mn(1), one Mn(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Mn(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(3), one Fe(1), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(3), one Mn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(1), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mn(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Fe(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one Mn(2), and one P(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Na(2), one Mn(3), one Fe(1), and one P(4) atom. is represented by the CIF file [CIF]
data_Na2Mn2Fe(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.808
_cell_length_b   8.808
_cell_length_c   6.609
_cell_angle_alpha   73.502
_cell_angle_beta   73.502
_cell_angle_gamma   92.863
_symmetry_Int_Tables_number   1
_cell_volume   466.641
_cell_formula_units_Z   2
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
  Na  Na0  1  0.021  0.979  0.000  1.0
  Na  Na1  1  0.983  0.017  0.500  1.0
  Na  Na2  1  0.500  0.500  0.251  1.0
  Na  Na3  1  0.500  0.500  0.749  1.0
  Mn  Mn4  1  0.934  0.625  0.390  1.0
  Mn  Mn5  1  0.375  0.066  0.610  1.0
  Mn  Mn6  1  0.269  0.731  0.500  1.0
  Mn  Mn7  1  0.729  0.271  0.000  1.0
  Fe  Fe8  1  0.063  0.381  0.115  1.0
  Fe  Fe9  1  0.619  0.937  0.885  1.0
  P  P10  1  0.657  0.873  0.377  1.0
  P  P11  1  0.127  0.343  0.623  1.0
  P  P12  1  0.345  0.128  0.122  1.0
  P  P13  1  0.872  0.655  0.878  1.0
  P  P14  1  0.287  0.713  0.000  1.0
  P  P15  1  0.715  0.285  0.500  1.0
  O  O16  1  0.663  0.999  0.147  1.0
  O  O17  1  0.001  0.337  0.853  1.0
  O  O18  1  0.318  0.998  0.349  1.0
  O  O19  1  0.002  0.682  0.651  1.0
  O  O20  1  0.534  0.726  0.426  1.0
  O  O21  1  0.274  0.466  0.574  1.0
  O  O22  1  0.468  0.274  0.079  1.0
  O  O23  1  0.726  0.532  0.921  1.0
  O  O24  1  0.261  0.536  0.001  1.0
  O  O25  1  0.464  0.739  0.999  1.0
  O  O26  1  0.737  0.451  0.524  1.0
  O  O27  1  0.549  0.263  0.476  1.0
  O  O28  1  0.604  0.949  0.570  1.0
  O  O29  1  0.051  0.396  0.430  1.0
  O  O30  1  0.406  0.049  0.935  1.0
  O  O31  1  0.951  0.594  0.065  1.0
  O  O32  1  0.831  0.841  0.353  1.0
  O  O33  1  0.159  0.169  0.647  1.0
  O  O34  1  0.175  0.181  0.126  1.0
  O  O35  1  0.819  0.825  0.874  1.0
  O  O36  1  0.179  0.744  0.210  1.0
  O  O37  1  0.256  0.821  0.790  1.0
  O  O38  1  0.838  0.260  0.287  1.0
  O  O39  1  0.740  0.162  0.713  1.0
[/CIF]
.
The structure described by Na2FeMn2(PO4)3 crystallizes in the monoclinic C2 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(9) atoms. In the second Na site, Na(2) is bonded to two equivalent O(10), two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form distorted NaO8 hexagonal bipyramids that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Fe(1)O6 octahedra,  an edgeedge with one P(4)O4 tetrahedra, and edges with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to one O(5), one O(6), two equivalent O(3), and two equivalent O(4) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(11), one O(2), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Fe(1)O6 octahedra. In the second Mn site, Mn(2) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid, and edges with two equivalent Mn(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(12), and two equivalent O(4) atoms to form distorted MnO6 octahedra that share corners with two equivalent Na(2)O8 hexagonal bipyramids, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and edges with two equivalent Fe(1)O6 octahedra. Fe(1) is bonded to one O(1), one O(10), one O(12), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  an edgeedge with one Na(2)O8 hexagonal bipyramid,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(7), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Na(2)O8 hexagonal bipyramid,  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-62°. In the second P site, P(2) is bonded to one O(10), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  an edgeedge with one Na(2)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 40-61°. In the third P site, P(3) is bonded to two equivalent O(11) and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-60°. In the fourth P site, P(4) is bonded to two equivalent O(12) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Fe(1)O6 octahedra, and  an edgeedge with one Na(2)O8 hexagonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mn(3), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(2), one Mn(1), one Mn(2), and one P(2) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na(3), one Mn(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Na(3), one Fe(1), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Na(3), one Mn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Fe(1), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Mn(1), and one P(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Fe(1), and one P(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one Mn(2), and one P(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Na(2), one Mn(3), one Fe(1), and one P(4) atom. is represented by the CIF file [CIF]
data_Na2Mn2Fe(PO4)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.808
_cell_length_b   8.808
_cell_length_c   6.609
_cell_angle_alpha   73.502
_cell_angle_beta   73.502
_cell_angle_gamma   92.863
_symmetry_Int_Tables_number   1
_cell_volume   466.641
_cell_formula_units_Z   2
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
  Na  Na0  1  0.021  0.979  0.000  1.0
  Na  Na1  1  0.983  0.017  0.500  1.0
  Na  Na2  1  0.500  0.500  0.251  1.0
  Na  Na3  1  0.500  0.500  0.749  1.0
  Mn  Mn4  1  0.934  0.625  0.390  1.0
  Mn  Mn5  1  0.375  0.066  0.610  1.0
  Mn  Mn6  1  0.269  0.731  0.500  1.0
  Mn  Mn7  1  0.729  0.271  0.000  1.0
  Fe  Fe8  1  0.063  0.381  0.115  1.0
  Fe  Fe9  1  0.619  0.937  0.885  1.0
  P  P10  1  0.657  0.873  0.377  1.0
  P  P11  1  0.127  0.343  0.623  1.0
  P  P12  1  0.345  0.128  0.122  1.0
  P  P13  1  0.872  0.655  0.878  1.0
  P  P14  1  0.287  0.713  0.000  1.0
  P  P15  1  0.715  0.285  0.500  1.0
  O  O16  1  0.663  0.999  0.147  1.0
  O  O17  1  0.001  0.337  0.853  1.0
  O  O18  1  0.318  0.998  0.349  1.0
  O  O19  1  0.002  0.682  0.651  1.0
  O  O20  1  0.534  0.726  0.426  1.0
  O  O21  1  0.274  0.466  0.574  1.0
  O  O22  1  0.468  0.274  0.079  1.0
  O  O23  1  0.726  0.532  0.921  1.0
  O  O24  1  0.261  0.536  0.001  1.0
  O  O25  1  0.464  0.739  0.999  1.0
  O  O26  1  0.737  0.451  0.524  1.0
  O  O27  1  0.549  0.263  0.476  1.0
  O  O28  1  0.604  0.949  0.570  1.0
  O  O29  1  0.051  0.396  0.430  1.0
  O  O30  1  0.406  0.049  0.935  1.0
  O  O31  1  0.951  0.594  0.065  1.0
  O  O32  1  0.831  0.841  0.353  1.0
  O  O33  1  0.159  0.169  0.647  1.0
  O  O34  1  0.175  0.181  0.126  1.0
  O  O35  1  0.819  0.825  0.874  1.0
  O  O36  1  0.179  0.744  0.210  1.0
  O  O37  1  0.256  0.821  0.790  1.0
  O  O38  1  0.838  0.260  0.287  1.0
  O  O39  1  0.740  0.162  0.713  1.0
[/CIF]
.