The crystal structure described by FeCo3O8 is trigonal omega-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(13), one O(2), one O(28), one O(7), and one O(8) atom to form FeO6 octahedra that share  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(6)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(10), one O(15), one O(16), one O(21), one O(4), and one O(9) atom to form FeO6 octahedra that share  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the third Fe site, Fe(3) is bonded to one O(12), one O(17), one O(18), one O(23), one O(24), and one O(29) atom to form distorted FeO6 octahedra that share  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(20), one O(25), one O(26), one O(31), one O(32), and one O(5) atom to form FeO6 octahedra that share  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. There are twelve inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(30), one O(4), one O(6), and one O(9) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. In the second Co site, Co(2) is bonded to one O(10), one O(3), one O(31), one O(4), one O(5), and one O(6) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. In the third Co site, Co(3) is bonded to one O(11), one O(3), one O(32), one O(5), one O(7), and one O(8) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(6)O6 octahedra. In the fourth Co site, Co(4) is bonded to one O(10), one O(12), one O(14), one O(17), one O(6), and one O(9) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(7)O6 octahedra. In the fifth Co site, Co(5) is bonded to one O(11), one O(12), one O(13), one O(14), one O(18), and one O(7) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra, and  an edgeedge with one Co(7)O6 octahedra. In the sixth Co site, Co(6) is bonded to one O(11), one O(13), one O(15), one O(16), one O(19), and one O(8) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the seventh Co site, Co(7) is bonded to one O(14), one O(17), one O(18), one O(20), one O(22), and one O(25) atom to form CoO6 octahedra that share  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the eighth Co site, Co(8) is bonded to one O(15), one O(19), one O(20), one O(21), one O(22), and one O(26) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the ninth Co site, Co(9) is bonded to one O(16), one O(19), one O(21), one O(23), one O(24), and one O(27) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the tenth Co site, Co(10) is bonded to one O(1), one O(22), one O(25), one O(26), one O(28), and one O(30) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the eleventh Co site, Co(11) is bonded to one O(2), one O(23), one O(27), one O(28), one O(29), and one O(30) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the twelfth Co site, Co(12) is bonded to one O(24), one O(27), one O(29), one O(3), one O(31), and one O(32) atom to form CoO6 octahedra that share  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(1), and one Co(10) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(1), and one Co(11) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Co(12), one Co(2), and one Co(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(2), and one Co(3) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Co(4) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(3), and one Co(5) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(3), and one Co(6) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(1), and one Co(4) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(2), and one Co(4) atom. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Co(3), one Co(5), and one Co(6) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(4), and one Co(5) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(5), and one Co(6) atom. In the fourteenth O site, O(14) is bonded in a distorted T-shaped geometry to one Co(4), one Co(5), and one Co(7) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(6), and one Co(8) atom. In the sixteenth O site, O(16) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(6), and one Co(9) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Fe(3), one Co(4), and one Co(7) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Fe(3), one Co(5), and one Co(7) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Co(6), one Co(8), and one Co(9) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal non-coplanar geometry to one Fe(4), one Co(7), and one Co(8) atom. In the twenty-first O site, O(21) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(8), and one Co(9) atom. In the twenty-second O site, O(22) is bonded in a distorted T-shaped geometry to one Co(10), one Co(7), and one Co(8) atom. In the twenty-third O site, O(23) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(11), and one Co(9) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Fe(3), one Co(12), and one Co(9) atom. In the twenty-fifth O site, O(25) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(10), and one Co(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(10), and one Co(8) atom. In the twenty-seventh O site, O(27) is bonded in a distorted T-shaped geometry to one Co(11), one Co(12), and one Co(9) atom. In the twenty-eighth O site, O(28) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(10), and one Co(11) atom. In the twenty-ninth O site, O(29) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(11), and one Co(12) atom. In the thirtieth O site, O(30) is bonded in a distorted T-shaped geometry to one Co(1), one Co(10), and one Co(11) atom. In the thirty-first O site, O(31) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(12), and one Co(2) atom. In the thirty-second O site, O(32) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(12), and one Co(3) atom. is represented by the CIF file [CIF]
data_FeCo3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.039
_cell_length_b   8.112
_cell_length_c   8.159
_cell_angle_alpha   89.717
_cell_angle_beta   89.985
_cell_angle_gamma   89.666
_symmetry_Int_Tables_number   1
_cell_volume   531.967
_cell_formula_units_Z   4
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
  Fe  Fe0  1  0.126  0.876  0.376  1.0
  Fe  Fe1  1  0.376  0.126  0.875  1.0
  Fe  Fe2  1  0.627  0.626  0.622  1.0
  Fe  Fe3  1  0.876  0.375  0.127  1.0
  Co  Co4  1  0.120  0.128  0.626  1.0
  Co  Co5  1  0.124  0.380  0.872  1.0
  Co  Co6  1  0.128  0.627  0.119  1.0
  Co  Co7  1  0.370  0.374  0.617  1.0
  Co  Co8  1  0.375  0.617  0.368  1.0
  Co  Co9  1  0.376  0.871  0.123  1.0
  Co  Co10  1  0.618  0.368  0.376  1.0
  Co  Co11  1  0.627  0.120  0.130  1.0
  Co  Co12  1  0.631  0.875  0.880  1.0
  Co  Co13  1  0.869  0.123  0.379  1.0
  Co  Co14  1  0.875  0.882  0.634  1.0
  Co  Co15  1  0.880  0.633  0.876  1.0
  O  O16  1  0.108  0.114  0.395  1.0
  O  O17  1  0.107  0.900  0.626  1.0
  O  O18  1  0.116  0.610  0.885  1.0
  O  O19  1  0.136  0.145  0.859  1.0
  O  O20  1  0.114  0.392  0.108  1.0
  O  O21  1  0.137  0.360  0.637  1.0
  O  O22  1  0.139  0.640  0.354  1.0
  O  O23  1  0.149  0.856  0.121  1.0
  O  O24  1  0.359  0.139  0.640  1.0
  O  O25  1  0.358  0.363  0.856  1.0
  O  O26  1  0.363  0.635  0.137  1.0
  O  O27  1  0.374  0.602  0.596  1.0
  O  O28  1  0.367  0.857  0.352  1.0
  O  O29  1  0.383  0.383  0.384  1.0
  O  O30  1  0.390  0.110  0.109  1.0
  O  O31  1  0.391  0.890  0.891  1.0
  O  O32  1  0.601  0.376  0.602  1.0
  O  O33  1  0.605  0.598  0.375  1.0
  O  O34  1  0.610  0.889  0.112  1.0
  O  O35  1  0.637  0.352  0.142  1.0
  O  O36  1  0.613  0.110  0.892  1.0
  O  O37  1  0.635  0.136  0.364  1.0
  O  O38  1  0.644  0.874  0.652  1.0
  O  O39  1  0.650  0.647  0.873  1.0
  O  O40  1  0.858  0.353  0.363  1.0
  O  O41  1  0.855  0.120  0.149  1.0
  O  O42  1  0.864  0.866  0.867  1.0
  O  O43  1  0.885  0.893  0.399  1.0
  O  O44  1  0.876  0.652  0.647  1.0
  O  O45  1  0.885  0.115  0.614  1.0
  O  O46  1  0.893  0.394  0.889  1.0
  O  O47  1  0.899  0.627  0.106  1.0
[/CIF]
.
The crystal structure described by FeCo3O8 is trigonal omega-derived structured and crystallizes in the triclinic P1 space group. There are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(13), one O(2), one O(28), one O(7), and one O(8) atom to form FeO6 octahedra that share  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(6)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(10), one O(15), one O(16), one O(21), one O(4), and one O(9) atom to form FeO6 octahedra that share  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the third Fe site, Fe(3) is bonded to one O(12), one O(17), one O(18), one O(23), one O(24), and one O(29) atom to form distorted FeO6 octahedra that share  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(20), one O(25), one O(26), one O(31), one O(32), and one O(5) atom to form FeO6 octahedra that share  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. There are twelve inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(30), one O(4), one O(6), and one O(9) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. In the second Co site, Co(2) is bonded to one O(10), one O(3), one O(31), one O(4), one O(5), and one O(6) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(4)O6 octahedra. In the third Co site, Co(3) is bonded to one O(11), one O(3), one O(32), one O(5), one O(7), and one O(8) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(6)O6 octahedra. In the fourth Co site, Co(4) is bonded to one O(10), one O(12), one O(14), one O(17), one O(6), and one O(9) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(7)O6 octahedra. In the fifth Co site, Co(5) is bonded to one O(11), one O(12), one O(13), one O(14), one O(18), and one O(7) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra, and  an edgeedge with one Co(7)O6 octahedra. In the sixth Co site, Co(6) is bonded to one O(11), one O(13), one O(15), one O(16), one O(19), and one O(8) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra,  an edgeedge with one Co(8)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the seventh Co site, Co(7) is bonded to one O(14), one O(17), one O(18), one O(20), one O(22), and one O(25) atom to form CoO6 octahedra that share  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(4)O6 octahedra,  an edgeedge with one Co(5)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the eighth Co site, Co(8) is bonded to one O(15), one O(19), one O(20), one O(21), one O(22), and one O(26) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the ninth Co site, Co(9) is bonded to one O(16), one O(19), one O(21), one O(23), one O(24), and one O(27) atom to form CoO6 octahedra that share  an edgeedge with one Fe(2)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra,  an edgeedge with one Co(6)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the tenth Co site, Co(10) is bonded to one O(1), one O(22), one O(25), one O(26), one O(28), and one O(30) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(7)O6 octahedra, and  an edgeedge with one Co(8)O6 octahedra. In the eleventh Co site, Co(11) is bonded to one O(2), one O(23), one O(27), one O(28), one O(29), and one O(30) atom to form CoO6 octahedra that share  an edgeedge with one Fe(1)O6 octahedra,  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Co(1)O6 octahedra,  an edgeedge with one Co(10)O6 octahedra,  an edgeedge with one Co(12)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. In the twelfth Co site, Co(12) is bonded to one O(24), one O(27), one O(29), one O(3), one O(31), and one O(32) atom to form CoO6 octahedra that share  an edgeedge with one Fe(3)O6 octahedra,  an edgeedge with one Fe(4)O6 octahedra,  an edgeedge with one Co(11)O6 octahedra,  an edgeedge with one Co(2)O6 octahedra,  an edgeedge with one Co(3)O6 octahedra, and  an edgeedge with one Co(9)O6 octahedra. There are thirty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(1), and one Co(10) atom. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(1), and one Co(11) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Co(12), one Co(2), and one Co(3) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(1), and one Co(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(2), and one Co(3) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Co(4) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(3), and one Co(5) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(3), and one Co(6) atom. In the ninth O site, O(9) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(1), and one Co(4) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(2), and one Co(4) atom. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one Co(3), one Co(5), and one Co(6) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(4), and one Co(5) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(5), and one Co(6) atom. In the fourteenth O site, O(14) is bonded in a distorted T-shaped geometry to one Co(4), one Co(5), and one Co(7) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(6), and one Co(8) atom. In the sixteenth O site, O(16) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(6), and one Co(9) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Fe(3), one Co(4), and one Co(7) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Fe(3), one Co(5), and one Co(7) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Co(6), one Co(8), and one Co(9) atom. In the twentieth O site, O(20) is bonded in a distorted trigonal non-coplanar geometry to one Fe(4), one Co(7), and one Co(8) atom. In the twenty-first O site, O(21) is bonded in a distorted T-shaped geometry to one Fe(2), one Co(8), and one Co(9) atom. In the twenty-second O site, O(22) is bonded in a distorted T-shaped geometry to one Co(10), one Co(7), and one Co(8) atom. In the twenty-third O site, O(23) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(11), and one Co(9) atom. In the twenty-fourth O site, O(24) is bonded in a 3-coordinate geometry to one Fe(3), one Co(12), and one Co(9) atom. In the twenty-fifth O site, O(25) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(10), and one Co(7) atom. In the twenty-sixth O site, O(26) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(10), and one Co(8) atom. In the twenty-seventh O site, O(27) is bonded in a distorted T-shaped geometry to one Co(11), one Co(12), and one Co(9) atom. In the twenty-eighth O site, O(28) is bonded in a distorted T-shaped geometry to one Fe(1), one Co(10), and one Co(11) atom. In the twenty-ninth O site, O(29) is bonded in a distorted T-shaped geometry to one Fe(3), one Co(11), and one Co(12) atom. In the thirtieth O site, O(30) is bonded in a distorted T-shaped geometry to one Co(1), one Co(10), and one Co(11) atom. In the thirty-first O site, O(31) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(12), and one Co(2) atom. In the thirty-second O site, O(32) is bonded in a distorted T-shaped geometry to one Fe(4), one Co(12), and one Co(3) atom. is represented by the CIF file [CIF]
data_FeCo3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.039
_cell_length_b   8.112
_cell_length_c   8.159
_cell_angle_alpha   89.717
_cell_angle_beta   89.985
_cell_angle_gamma   89.666
_symmetry_Int_Tables_number   1
_cell_volume   531.967
_cell_formula_units_Z   4
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
  Fe  Fe0  1  0.126  0.876  0.376  1.0
  Fe  Fe1  1  0.376  0.126  0.875  1.0
  Fe  Fe2  1  0.627  0.626  0.622  1.0
  Fe  Fe3  1  0.876  0.375  0.127  1.0
  Co  Co4  1  0.120  0.128  0.626  1.0
  Co  Co5  1  0.124  0.380  0.872  1.0
  Co  Co6  1  0.128  0.627  0.119  1.0
  Co  Co7  1  0.370  0.374  0.617  1.0
  Co  Co8  1  0.375  0.617  0.368  1.0
  Co  Co9  1  0.376  0.871  0.123  1.0
  Co  Co10  1  0.618  0.368  0.376  1.0
  Co  Co11  1  0.627  0.120  0.130  1.0
  Co  Co12  1  0.631  0.875  0.880  1.0
  Co  Co13  1  0.869  0.123  0.379  1.0
  Co  Co14  1  0.875  0.882  0.634  1.0
  Co  Co15  1  0.880  0.633  0.876  1.0
  O  O16  1  0.108  0.114  0.395  1.0
  O  O17  1  0.107  0.900  0.626  1.0
  O  O18  1  0.116  0.610  0.885  1.0
  O  O19  1  0.136  0.145  0.859  1.0
  O  O20  1  0.114  0.392  0.108  1.0
  O  O21  1  0.137  0.360  0.637  1.0
  O  O22  1  0.139  0.640  0.354  1.0
  O  O23  1  0.149  0.856  0.121  1.0
  O  O24  1  0.359  0.139  0.640  1.0
  O  O25  1  0.358  0.363  0.856  1.0
  O  O26  1  0.363  0.635  0.137  1.0
  O  O27  1  0.374  0.602  0.596  1.0
  O  O28  1  0.367  0.857  0.352  1.0
  O  O29  1  0.383  0.383  0.384  1.0
  O  O30  1  0.390  0.110  0.109  1.0
  O  O31  1  0.391  0.890  0.891  1.0
  O  O32  1  0.601  0.376  0.602  1.0
  O  O33  1  0.605  0.598  0.375  1.0
  O  O34  1  0.610  0.889  0.112  1.0
  O  O35  1  0.637  0.352  0.142  1.0
  O  O36  1  0.613  0.110  0.892  1.0
  O  O37  1  0.635  0.136  0.364  1.0
  O  O38  1  0.644  0.874  0.652  1.0
  O  O39  1  0.650  0.647  0.873  1.0
  O  O40  1  0.858  0.353  0.363  1.0
  O  O41  1  0.855  0.120  0.149  1.0
  O  O42  1  0.864  0.866  0.867  1.0
  O  O43  1  0.885  0.893  0.399  1.0
  O  O44  1  0.876  0.652  0.647  1.0
  O  O45  1  0.885  0.115  0.614  1.0
  O  O46  1  0.893  0.394  0.889  1.0
  O  O47  1  0.899  0.627  0.106  1.0
[/CIF]
.