The structure described by Li3FeBSiO7 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(4) atoms. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Fe(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form distorted FeO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Si(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-51°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), two equivalent Li(2), and one B(1) atom to form OLi3B tetrahedra that share corners with three equivalent O(3)Li2FeB tetrahedra and corners with four equivalent O(4)Li2FeSi trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Li(1), two equivalent Li(2), one Fe(1), and one B(1) atom. In the third O site, O(3) is bonded to two equivalent Li(2), one Fe(1), and one B(1) atom to form distorted OLi2FeB tetrahedra that share corners with three equivalent O(1)Li3B tetrahedra and corners with four equivalent O(4)Li2FeSi trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi trigonal pyramids that share corners with two equivalent O(3)Li2FeB tetrahedra, corners with two equivalent O(1)Li3B tetrahedra,  a cornercorner with one O(4)Li2FeSi trigonal pyramid, and  an edgeedge with one O(4)Li2FeSi trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Li(2), one Fe(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to two equivalent Li(2), one Fe(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Li3FeSiBO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.368
_cell_length_b   5.066
_cell_length_c   8.443
_cell_angle_alpha   85.488
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   271.512
_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
  Li  Li0  1  0.750  0.247  0.893  1.0
  Li  Li1  1  0.004  0.756  0.759  1.0
  Li  Li2  1  0.496  0.756  0.759  1.0
  Li  Li3  1  0.504  0.244  0.241  1.0
  Li  Li4  1  0.996  0.244  0.241  1.0
  Li  Li5  1  0.250  0.753  0.107  1.0
  Fe  Fe6  1  0.250  0.202  0.670  1.0
  Fe  Fe7  1  0.750  0.798  0.330  1.0
  Si  Si8  1  0.750  0.275  0.575  1.0
  Si  Si9  1  0.250  0.725  0.425  1.0
  B  B10  1  0.250  0.266  0.961  1.0
  B  B11  1  0.750  0.734  0.039  1.0
  O  O12  1  0.750  0.648  0.891  1.0
  O  O13  1  0.250  0.009  0.919  1.0
  O  O14  1  0.250  0.459  0.830  1.0
  O  O15  1  0.944  0.174  0.695  1.0
  O  O16  1  0.556  0.174  0.695  1.0
  O  O17  1  0.750  0.597  0.536  1.0
  O  O18  1  0.250  0.852  0.598  1.0
  O  O19  1  0.750  0.148  0.402  1.0
  O  O20  1  0.250  0.403  0.464  1.0
  O  O21  1  0.444  0.826  0.305  1.0
  O  O22  1  0.056  0.826  0.305  1.0
  O  O23  1  0.750  0.541  0.170  1.0
  O  O24  1  0.750  0.991  0.081  1.0
  O  O25  1  0.250  0.352  0.109  1.0
[/CIF]
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The structure described by Li3FeBSiO7 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), and two equivalent O(4) atoms. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. Fe(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form distorted FeO6 octahedra that share corners with four equivalent Si(1)O4 tetrahedra. B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Si(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-51°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), two equivalent Li(2), and one B(1) atom to form OLi3B tetrahedra that share corners with three equivalent O(3)Li2FeB tetrahedra and corners with four equivalent O(4)Li2FeSi trigonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Li(1), two equivalent Li(2), one Fe(1), and one B(1) atom. In the third O site, O(3) is bonded to two equivalent Li(2), one Fe(1), and one B(1) atom to form distorted OLi2FeB tetrahedra that share corners with three equivalent O(1)Li3B tetrahedra and corners with four equivalent O(4)Li2FeSi trigonal pyramids. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi trigonal pyramids that share corners with two equivalent O(3)Li2FeB tetrahedra, corners with two equivalent O(1)Li3B tetrahedra,  a cornercorner with one O(4)Li2FeSi trigonal pyramid, and  an edgeedge with one O(4)Li2FeSi trigonal pyramid. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to two equivalent Li(2), one Fe(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to two equivalent Li(2), one Fe(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Li3FeSiBO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.368
_cell_length_b   5.066
_cell_length_c   8.443
_cell_angle_alpha   85.488
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   271.512
_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
  Li  Li0  1  0.750  0.247  0.893  1.0
  Li  Li1  1  0.004  0.756  0.759  1.0
  Li  Li2  1  0.496  0.756  0.759  1.0
  Li  Li3  1  0.504  0.244  0.241  1.0
  Li  Li4  1  0.996  0.244  0.241  1.0
  Li  Li5  1  0.250  0.753  0.107  1.0
  Fe  Fe6  1  0.250  0.202  0.670  1.0
  Fe  Fe7  1  0.750  0.798  0.330  1.0
  Si  Si8  1  0.750  0.275  0.575  1.0
  Si  Si9  1  0.250  0.725  0.425  1.0
  B  B10  1  0.250  0.266  0.961  1.0
  B  B11  1  0.750  0.734  0.039  1.0
  O  O12  1  0.750  0.648  0.891  1.0
  O  O13  1  0.250  0.009  0.919  1.0
  O  O14  1  0.250  0.459  0.830  1.0
  O  O15  1  0.944  0.174  0.695  1.0
  O  O16  1  0.556  0.174  0.695  1.0
  O  O17  1  0.750  0.597  0.536  1.0
  O  O18  1  0.250  0.852  0.598  1.0
  O  O19  1  0.750  0.148  0.402  1.0
  O  O20  1  0.250  0.403  0.464  1.0
  O  O21  1  0.444  0.826  0.305  1.0
  O  O22  1  0.056  0.826  0.305  1.0
  O  O23  1  0.750  0.541  0.170  1.0
  O  O24  1  0.750  0.991  0.081  1.0
  O  O25  1  0.250  0.352  0.109  1.0
[/CIF]
.