The structure described by LiFeSiO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and corners with three equivalent Fe(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Li(2)O4 tetrahedra, and corners with three equivalent Fe(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(2), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Fe(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Li(1), one Fe(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiFeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.212
_cell_length_b   8.430
_cell_length_c   8.555
_cell_angle_alpha   72.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   358.049
_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
  Li  Li0  1  0.335  0.094  0.020  1.0
  Li  Li1  1  0.823  0.267  0.499  1.0
  Li  Li2  1  0.665  0.594  0.020  1.0
  Li  Li3  1  0.177  0.767  0.499  1.0
  Fe  Fe4  1  0.172  0.000  0.750  1.0
  Fe  Fe5  1  0.327  0.332  0.263  1.0
  Fe  Fe6  1  0.828  0.500  0.750  1.0
  Fe  Fe7  1  0.673  0.832  0.263  1.0
  Si  Si8  1  0.823  0.220  0.135  1.0
  Si  Si9  1  0.320  0.372  0.630  1.0
  Si  Si10  1  0.177  0.720  0.135  1.0
  Si  Si11  1  0.680  0.872  0.630  1.0
  O  O12  1  0.685  0.052  0.115  1.0
  O  O13  1  0.838  0.031  0.657  1.0
  O  O14  1  0.132  0.191  0.171  1.0
  O  O15  1  0.680  0.270  0.287  1.0
  O  O16  1  0.270  0.204  0.786  1.0
  O  O17  1  0.199  0.328  0.470  1.0
  O  O18  1  0.315  0.552  0.115  1.0
  O  O19  1  0.627  0.414  0.606  1.0
  O  O20  1  0.771  0.378  0.971  1.0
  O  O21  1  0.162  0.531  0.657  1.0
  O  O22  1  0.868  0.691  0.171  1.0
  O  O23  1  0.320  0.770  0.287  1.0
  O  O24  1  0.730  0.704  0.786  1.0
  O  O25  1  0.801  0.828  0.470  1.0
  O  O26  1  0.373  0.914  0.606  1.0
  O  O27  1  0.229  0.878  0.971  1.0
[/CIF]
.
The structure described by LiFeSiO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and corners with three equivalent Fe(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with three equivalent Li(2)O4 tetrahedra, and corners with three equivalent Fe(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(2), and one Si(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Fe(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Li(1), one Fe(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LiFeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.212
_cell_length_b   8.430
_cell_length_c   8.555
_cell_angle_alpha   72.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   358.049
_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
  Li  Li0  1  0.335  0.094  0.020  1.0
  Li  Li1  1  0.823  0.267  0.499  1.0
  Li  Li2  1  0.665  0.594  0.020  1.0
  Li  Li3  1  0.177  0.767  0.499  1.0
  Fe  Fe4  1  0.172  0.000  0.750  1.0
  Fe  Fe5  1  0.327  0.332  0.263  1.0
  Fe  Fe6  1  0.828  0.500  0.750  1.0
  Fe  Fe7  1  0.673  0.832  0.263  1.0
  Si  Si8  1  0.823  0.220  0.135  1.0
  Si  Si9  1  0.320  0.372  0.630  1.0
  Si  Si10  1  0.177  0.720  0.135  1.0
  Si  Si11  1  0.680  0.872  0.630  1.0
  O  O12  1  0.685  0.052  0.115  1.0
  O  O13  1  0.838  0.031  0.657  1.0
  O  O14  1  0.132  0.191  0.171  1.0
  O  O15  1  0.680  0.270  0.287  1.0
  O  O16  1  0.270  0.204  0.786  1.0
  O  O17  1  0.199  0.328  0.470  1.0
  O  O18  1  0.315  0.552  0.115  1.0
  O  O19  1  0.627  0.414  0.606  1.0
  O  O20  1  0.771  0.378  0.971  1.0
  O  O21  1  0.162  0.531  0.657  1.0
  O  O22  1  0.868  0.691  0.171  1.0
  O  O23  1  0.320  0.770  0.287  1.0
  O  O24  1  0.730  0.704  0.786  1.0
  O  O25  1  0.801  0.828  0.470  1.0
  O  O26  1  0.373  0.914  0.606  1.0
  O  O27  1  0.229  0.878  0.971  1.0
[/CIF]
.