The crystal structure described by FeOOH crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to two equivalent O(2) and three equivalent O(1) atoms to form corner-sharing FeO5 trigonal bipyramids. H(1) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Fe(1) and one H(1) atom. is represented by the CIF file [CIF]
data_FeHO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.710
_cell_length_b   5.394
_cell_length_c   8.059
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   161.300
_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  0.250  0.711  0.758  1.0
  Fe  Fe1  1  0.250  0.789  0.258  1.0
  Fe  Fe2  1  0.750  0.289  0.242  1.0
  Fe  Fe3  1  0.750  0.211  0.742  1.0
  H  H4  1  0.250  0.509  0.496  1.0
  H  H5  1  0.250  0.991  0.996  1.0
  H  H6  1  0.750  0.491  0.504  1.0
  H  H7  1  0.750  0.009  0.004  1.0
  O  O8  1  0.250  0.146  0.262  1.0
  O  O9  1  0.250  0.354  0.762  1.0
  O  O10  1  0.750  0.854  0.738  1.0
  O  O11  1  0.750  0.646  0.238  1.0
  O  O12  1  0.250  0.692  0.500  1.0
  O  O13  1  0.250  0.808  1.000  1.0
  O  O14  1  0.750  0.308  0.500  1.0
  O  O15  1  0.750  0.192  0.000  1.0
[/CIF]
.
The crystal structure described by FeOOH crystallizes in the orthorhombic Pnma space group. Fe(1) is bonded to two equivalent O(2) and three equivalent O(1) atoms to form corner-sharing FeO5 trigonal bipyramids. H(1) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to three equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Fe(1) and one H(1) atom. is represented by the CIF file [CIF]
data_FeHO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.710
_cell_length_b   5.394
_cell_length_c   8.059
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   161.300
_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  0.250  0.711  0.758  1.0
  Fe  Fe1  1  0.250  0.789  0.258  1.0
  Fe  Fe2  1  0.750  0.289  0.242  1.0
  Fe  Fe3  1  0.750  0.211  0.742  1.0
  H  H4  1  0.250  0.509  0.496  1.0
  H  H5  1  0.250  0.991  0.996  1.0
  H  H6  1  0.750  0.491  0.504  1.0
  H  H7  1  0.750  0.009  0.004  1.0
  O  O8  1  0.250  0.146  0.262  1.0
  O  O9  1  0.250  0.354  0.762  1.0
  O  O10  1  0.750  0.854  0.738  1.0
  O  O11  1  0.750  0.646  0.238  1.0
  O  O12  1  0.250  0.692  0.500  1.0
  O  O13  1  0.250  0.808  1.000  1.0
  O  O14  1  0.750  0.308  0.500  1.0
  O  O15  1  0.750  0.192  0.000  1.0
[/CIF]
.