The crystal structure described by FeO is Halite, Rock Salt-like 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(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-6°. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-6°. In the third Fe site, Fe(3) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fourth Fe site, Fe(4) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), one Fe(3), two equivalent Fe(1), and two equivalent Fe(4) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to one Fe(1), one Fe(4), two equivalent Fe(2), and two equivalent Fe(3) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third O site, O(3) is bonded to one Fe(3), one Fe(4), two equivalent Fe(1), and two equivalent Fe(2) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fourth O site, O(4) is bonded to one Fe(1), one Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.092
_cell_length_b   3.118
_cell_length_c   5.332
_cell_angle_alpha   105.771
_cell_angle_beta   106.456
_cell_angle_gamma   61.054
_symmetry_Int_Tables_number   1
_cell_volume   42.591
_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
  Fe  Fe0  1  0.001  0.999  0.000  1.0
  Fe  Fe1  1  0.498  0.500  0.500  1.0
  O  O2  1  0.224  0.238  0.749  1.0
  O  O3  1  0.777  0.764  0.251  1.0
[/CIF]
.
The crystal structure described by FeO is Halite, Rock Salt-like 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(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-6°. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-6°. In the third Fe site, Fe(3) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fourth Fe site, Fe(4) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form a mixture of edge and corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Fe(2), one Fe(3), two equivalent Fe(1), and two equivalent Fe(4) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the second O site, O(2) is bonded to one Fe(1), one Fe(4), two equivalent Fe(2), and two equivalent Fe(3) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the third O site, O(3) is bonded to one Fe(3), one Fe(4), two equivalent Fe(1), and two equivalent Fe(2) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fourth O site, O(4) is bonded to one Fe(1), one Fe(2), two equivalent Fe(3), and two equivalent Fe(4) atoms to form a mixture of edge and corner-sharing OFe6 octahedra. The corner-sharing octahedral tilt angles range from 0-2°. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.092
_cell_length_b   3.118
_cell_length_c   5.332
_cell_angle_alpha   105.771
_cell_angle_beta   106.456
_cell_angle_gamma   61.054
_symmetry_Int_Tables_number   1
_cell_volume   42.591
_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
  Fe  Fe0  1  0.001  0.999  0.000  1.0
  Fe  Fe1  1  0.498  0.500  0.500  1.0
  O  O2  1  0.224  0.238  0.749  1.0
  O  O3  1  0.777  0.764  0.251  1.0
[/CIF]
.