The structure described by Li2FeSi3O8 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted see-saw-like geometry to one O(2), one O(3), one O(4), and one O(7) atom. In the second Li site, Li(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(5) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Li(2)O4 trigonal pyramids. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and  a cornercorner with one Li(2)O4 trigonal pyramid. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Li(2)O4 trigonal pyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Fe(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Li(1), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Li(2), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2FeSi3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.103
_cell_length_b   6.294
_cell_length_c   6.298
_cell_angle_alpha   76.452
_cell_angle_beta   72.660
_cell_angle_gamma   74.409
_symmetry_Int_Tables_number   1
_cell_volume   183.355
_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  Fe0  1  0.349  0.627  0.709  1.0
  Li  Li1  1  0.720  0.854  0.358  1.0
  Li  Li2  1  0.219  0.121  0.692  1.0
  O  O3  1  0.013  0.868  0.819  1.0
  O  O4  1  0.947  0.178  0.240  1.0
  O  O5  1  0.561  0.882  0.672  1.0
  O  O6  1  0.645  0.545  0.429  1.0
  O  O7  1  0.297  0.323  0.860  1.0
  O  O8  1  0.711  0.550  0.990  1.0
  O  O9  1  0.493  0.944  0.105  1.0
  O  O10  1  0.391  0.293  0.287  1.0
  Si  Si11  1  0.701  0.820  0.884  1.0
  Si  Si12  1  0.673  0.399  0.244  1.0
  Si  Si13  1  0.281  0.194  0.113  1.0
[/CIF]
.
The structure described by Li2FeSi3O8 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a distorted see-saw-like geometry to one O(2), one O(3), one O(4), and one O(7) atom. In the second Li site, Li(2) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(5) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Li(2)O4 trigonal pyramids. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and  a cornercorner with one Li(2)O4 trigonal pyramid. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Li(2)O4 trigonal pyramids. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(2), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Fe(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Li(2), one Fe(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Li(1), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Li(2), one Si(2), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2FeSi3O8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.103
_cell_length_b   6.294
_cell_length_c   6.298
_cell_angle_alpha   76.452
_cell_angle_beta   72.660
_cell_angle_gamma   74.409
_symmetry_Int_Tables_number   1
_cell_volume   183.355
_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  Fe0  1  0.349  0.627  0.709  1.0
  Li  Li1  1  0.720  0.854  0.358  1.0
  Li  Li2  1  0.219  0.121  0.692  1.0
  O  O3  1  0.013  0.868  0.819  1.0
  O  O4  1  0.947  0.178  0.240  1.0
  O  O5  1  0.561  0.882  0.672  1.0
  O  O6  1  0.645  0.545  0.429  1.0
  O  O7  1  0.297  0.323  0.860  1.0
  O  O8  1  0.711  0.550  0.990  1.0
  O  O9  1  0.493  0.944  0.105  1.0
  O  O10  1  0.391  0.293  0.287  1.0
  Si  Si11  1  0.701  0.820  0.884  1.0
  Si  Si12  1  0.673  0.399  0.244  1.0
  Si  Si13  1  0.281  0.194  0.113  1.0
[/CIF]
.