The crystal structure described by Li2Fe(Si2O5)3 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 3-coordinate geometry to one O(1), one O(4), and one O(6) atom. In the second Li site, Li(2) is bonded in a distorted T-shaped geometry to one O(2), one O(4), and one O(6) atom. Fe(1) is bonded to one O(1), one O(10), one O(15), one O(2), and one O(4) atom to form distorted FeO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(14), one O(15), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(12), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(11), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(13), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(1), one O(12), one O(14), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(6) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(1), and one Si(5) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Fe(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(6) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Fe(1) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Si(4) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(6) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Fe(1) and one Si(2) atom. is represented by the CIF card [CIF]
data_Li2Fe(Si2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.451
_cell_length_b   7.451
_cell_length_c   14.841
_cell_angle_alpha   80.235
_cell_angle_beta   80.235
_cell_angle_gamma   58.314
_symmetry_Int_Tables_number   1
_cell_volume   687.797
_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  0.713  0.684  0.051  1.0
  Li  Li1  1  0.049  0.349  0.161  1.0
  Li  Li2  1  0.684  0.713  0.551  1.0
  Li  Li3  1  0.349  0.049  0.661  1.0
  Fe  Fe4  1  0.768  0.281  0.104  1.0
  Fe  Fe5  1  0.281  0.768  0.604  1.0
  Si  Si6  1  0.541  0.640  0.253  1.0
  Si  Si7  1  0.031  0.081  0.436  1.0
  Si  Si8  1  0.640  0.541  0.753  1.0
  Si  Si9  1  0.081  0.031  0.936  1.0
  Si  Si10  1  0.374  0.167  0.450  1.0
  Si  Si11  1  0.634  1.000  0.253  1.0
  Si  Si12  1  0.167  0.374  0.950  1.0
  Si  Si13  1  1.000  0.634  0.753  1.0
  Si  Si14  1  0.074  0.912  0.244  1.0
  Si  Si15  1  0.556  0.436  0.458  1.0
  Si  Si16  1  0.912  0.074  0.744  1.0
  Si  Si17  1  0.436  0.556  0.958  1.0
  O  O18  1  0.562  0.539  0.042  1.0
  O  O19  1  0.039  0.079  0.152  1.0
  O  O20  1  0.067  0.030  0.329  1.0
  O  O21  1  0.740  0.463  0.193  1.0
  O  O22  1  0.572  0.572  0.362  1.0
  O  O23  1  0.539  0.562  0.542  1.0
  O  O24  1  0.996  0.465  0.037  1.0
  O  O25  1  0.079  0.039  0.652  1.0
  O  O26  1  0.552  0.856  0.221  1.0
  O  O27  1  0.030  0.067  0.829  1.0
  O  O28  1  0.463  0.740  0.693  1.0
  O  O29  1  0.128  0.232  0.440  1.0
  O  O30  1  0.572  0.572  0.862  1.0
  O  O31  1  0.465  0.996  0.537  1.0
  O  O32  1  0.516  0.079  0.353  1.0
  O  O33  1  0.856  0.552  0.721  1.0
  O  O34  1  0.587  0.191  0.174  1.0
  O  O35  1  0.892  0.845  0.262  1.0
  O  O36  1  0.232  0.128  0.940  1.0
  O  O37  1  0.365  0.388  0.461  1.0
  O  O38  1  0.079  0.516  0.853  1.0
  O  O39  1  0.306  0.695  0.233  1.0
  O  O40  1  0.191  0.587  0.674  1.0
  O  O41  1  0.845  0.892  0.762  1.0
  O  O42  1  0.778  0.209  0.467  1.0
  O  O43  1  0.146  0.852  0.496  1.0
  O  O44  1  0.388  0.365  0.961  1.0
  O  O45  1  0.695  0.306  0.733  1.0
  O  O46  1  0.209  0.778  0.967  1.0
  O  O47  1  0.852  0.146  0.996  1.0
[/CIF]
.
The crystal structure described by Li2Fe(Si2O5)3 crystallizes in the monoclinic Cc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 3-coordinate geometry to one O(1), one O(4), and one O(6) atom. In the second Li site, Li(2) is bonded in a distorted T-shaped geometry to one O(2), one O(4), and one O(6) atom. Fe(1) is bonded to one O(1), one O(10), one O(15), one O(2), and one O(4) atom to form distorted FeO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(4), one O(5), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(14), one O(15), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(12), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(11), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(13), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(1), one O(12), one O(14), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Si(6) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(2), one Fe(1), and one Si(5) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Fe(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(6) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(3) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Fe(1) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Si(4) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(6) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one Fe(1) and one Si(2) atom. is represented by the CIF card [CIF]
data_Li2Fe(Si2O5)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.451
_cell_length_b   7.451
_cell_length_c   14.841
_cell_angle_alpha   80.235
_cell_angle_beta   80.235
_cell_angle_gamma   58.314
_symmetry_Int_Tables_number   1
_cell_volume   687.797
_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  0.713  0.684  0.051  1.0
  Li  Li1  1  0.049  0.349  0.161  1.0
  Li  Li2  1  0.684  0.713  0.551  1.0
  Li  Li3  1  0.349  0.049  0.661  1.0
  Fe  Fe4  1  0.768  0.281  0.104  1.0
  Fe  Fe5  1  0.281  0.768  0.604  1.0
  Si  Si6  1  0.541  0.640  0.253  1.0
  Si  Si7  1  0.031  0.081  0.436  1.0
  Si  Si8  1  0.640  0.541  0.753  1.0
  Si  Si9  1  0.081  0.031  0.936  1.0
  Si  Si10  1  0.374  0.167  0.450  1.0
  Si  Si11  1  0.634  1.000  0.253  1.0
  Si  Si12  1  0.167  0.374  0.950  1.0
  Si  Si13  1  1.000  0.634  0.753  1.0
  Si  Si14  1  0.074  0.912  0.244  1.0
  Si  Si15  1  0.556  0.436  0.458  1.0
  Si  Si16  1  0.912  0.074  0.744  1.0
  Si  Si17  1  0.436  0.556  0.958  1.0
  O  O18  1  0.562  0.539  0.042  1.0
  O  O19  1  0.039  0.079  0.152  1.0
  O  O20  1  0.067  0.030  0.329  1.0
  O  O21  1  0.740  0.463  0.193  1.0
  O  O22  1  0.572  0.572  0.362  1.0
  O  O23  1  0.539  0.562  0.542  1.0
  O  O24  1  0.996  0.465  0.037  1.0
  O  O25  1  0.079  0.039  0.652  1.0
  O  O26  1  0.552  0.856  0.221  1.0
  O  O27  1  0.030  0.067  0.829  1.0
  O  O28  1  0.463  0.740  0.693  1.0
  O  O29  1  0.128  0.232  0.440  1.0
  O  O30  1  0.572  0.572  0.862  1.0
  O  O31  1  0.465  0.996  0.537  1.0
  O  O32  1  0.516  0.079  0.353  1.0
  O  O33  1  0.856  0.552  0.721  1.0
  O  O34  1  0.587  0.191  0.174  1.0
  O  O35  1  0.892  0.845  0.262  1.0
  O  O36  1  0.232  0.128  0.940  1.0
  O  O37  1  0.365  0.388  0.461  1.0
  O  O38  1  0.079  0.516  0.853  1.0
  O  O39  1  0.306  0.695  0.233  1.0
  O  O40  1  0.191  0.587  0.674  1.0
  O  O41  1  0.845  0.892  0.762  1.0
  O  O42  1  0.778  0.209  0.467  1.0
  O  O43  1  0.146  0.852  0.496  1.0
  O  O44  1  0.388  0.365  0.961  1.0
  O  O45  1  0.695  0.306  0.733  1.0
  O  O46  1  0.209  0.778  0.967  1.0
  O  O47  1  0.852  0.146  0.996  1.0
[/CIF]
.