data_FeGeAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.84
_cell_length_b   2.84
_cell_length_c   8.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   91.03
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeGeAs2
_chemical_formula_sum   'Fe1 Ge1 As2'
_cell_volume   67.29
_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
  Fe  Fe2  1  0.0  0.0  0.0  1.0
  Ge  Ge3  1  0.0  0.0  0.17  1.0
  As  As0  1  0.99  0.0  0.81  1.0
  As  As1  1  0.99  0.0  0.52  1.0

data_FeGeAs2
_symmetry_space_group_name_H-M   P4mm
_cell_length_a   2.84
_cell_length_b   2.84
_cell_length_c   8.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   99
_chemical_formula_structural   FeGeAs2
_chemical_formula_sum   'Fe1 Ge1 As2'
_cell_volume   67.3
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x, z'
  3  '-x, -y, z'
  4  'y, -x, z'
  5  '-x, y, z'
  6  'y, x, z'
  7  'x, -y, z'
  8  '-y, -x, 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  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.0  0.17  1.0
  As  As2  1  0.0  0.0  0.52  1.0
  As  As3  1  0.0  0.0  0.81  1.0

Fe Ge As As
Fe Ge As As 0 2 - o - 0 1 o o o 1 3 - o o 2 3 o o o 3 3 o + o 3 3 + o o 
FeGeAs2 crystallizes in the monoclinic Pm space group. Fe(1) is bonded in a linear geometry to one Ge(1) and one As(1) atom. The Fe(1)-Ge(1) bond length is 1.41 Å. The Fe(1)-As(1) bond length is 1.55 Å. Ge(1) is bonded in a single-bond geometry to one Fe(1) and one As(2) atom. The Ge(1)-As(2) bond length is 2.96 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a single-bond geometry to one Fe(1) and one As(2) atom. The As(1)-As(2) bond length is 2.41 Å. In the second As site, As(2) is bonded to one Ge(1), one As(1), and four equivalent As(2) atoms to form a mixture of edge and corner-sharing AsGeAs5 octahedra. The corner-sharing octahedra are not tilted. All As(2)-As(2) bond lengths are 2.84 Å.