The compound described by Li2Co(Si2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), one O(6), one O(8), and two equivalent O(4) atoms. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(7), one O(9), and two equivalent O(10) atoms. Co(1) is bonded to one O(10), one O(8), one O(9), and two equivalent O(7) atoms to form CoO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Co(1)O5 square pyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(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 fourth Si site, Si(4) is bonded to one O(1), one O(2), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(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 ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Li(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Li(1), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(1), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(2), two equivalent Co(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Li(1), one Co(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Li(2), one Co(1), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(2), one Co(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_Li2Co(Si2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.907
_cell_length_b   7.590
_cell_length_c   9.647
_cell_angle_alpha   99.697
_cell_angle_beta   103.198
_cell_angle_gamma   116.623
_symmetry_Int_Tables_number   1
_cell_volume   418.368
_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  0.378  0.235  0.021  1.0
  Li  Li1  1  0.213  0.686  0.572  1.0
  Li  Li2  1  0.787  0.314  0.428  1.0
  Li  Li3  1  0.622  0.765  0.979  1.0
  Co  Co4  1  0.245  0.308  0.428  1.0
  Co  Co5  1  0.755  0.692  0.572  1.0
  Si  Si6  1  0.243  0.950  0.190  1.0
  Si  Si7  1  0.384  0.635  0.255  1.0
  Si  Si8  1  0.803  0.610  0.235  1.0
  Si  Si9  1  0.890  0.272  0.141  1.0
  Si  Si10  1  0.110  0.728  0.859  1.0
  Si  Si11  1  0.197  0.390  0.765  1.0
  Si  Si12  1  0.616  0.365  0.745  1.0
  Si  Si13  1  0.757  0.050  0.810  1.0
  O  O14  1  0.232  0.931  0.012  1.0
  O  O15  1  0.133  0.448  0.134  1.0
  O  O16  1  0.405  0.860  0.261  1.0
  O  O17  1  0.567  0.623  0.175  1.0
  O  O18  1  0.979  0.794  0.182  1.0
  O  O19  1  0.722  0.377  0.122  1.0
  O  O20  1  0.432  0.613  0.420  1.0
  O  O21  1  0.347  0.189  0.271  1.0
  O  O22  1  0.082  0.788  0.708  1.0
  O  O23  1  0.110  0.378  0.593  1.0
  O  O24  1  0.890  0.622  0.407  1.0
  O  O25  1  0.918  0.212  0.292  1.0
  O  O26  1  0.653  0.811  0.729  1.0
  O  O27  1  0.568  0.387  0.580  1.0
  O  O28  1  0.278  0.623  0.878  1.0
  O  O29  1  0.021  0.206  0.818  1.0
  O  O30  1  0.433  0.377  0.825  1.0
  O  O31  1  0.595  0.140  0.739  1.0
  O  O32  1  0.867  0.552  0.866  1.0
  O  O33  1  0.768  0.069  0.988  1.0
[/CIF]
.
The compound described by Li2Co(Si2O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), one O(6), one O(8), and two equivalent O(4) atoms. In the second Li site, Li(2) is bonded in a 4-coordinate geometry to one O(7), one O(9), and two equivalent O(10) atoms. Co(1) is bonded to one O(10), one O(8), one O(9), and two equivalent O(7) atoms to form CoO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Co(1)O5 square pyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Co(1)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(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 fourth Si site, Si(4) is bonded to one O(1), one O(2), one O(6), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Co(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 ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Li(1), one Si(2), and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Li(1), one Si(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(1), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(2), two equivalent Co(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Li(1), one Co(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Li(2), one Co(1), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(2), one Co(1), and one Si(3) atom. is represented by the CIF file [CIF]
data_Li2Co(Si2O5)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.907
_cell_length_b   7.590
_cell_length_c   9.647
_cell_angle_alpha   99.697
_cell_angle_beta   103.198
_cell_angle_gamma   116.623
_symmetry_Int_Tables_number   1
_cell_volume   418.368
_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  0.378  0.235  0.021  1.0
  Li  Li1  1  0.213  0.686  0.572  1.0
  Li  Li2  1  0.787  0.314  0.428  1.0
  Li  Li3  1  0.622  0.765  0.979  1.0
  Co  Co4  1  0.245  0.308  0.428  1.0
  Co  Co5  1  0.755  0.692  0.572  1.0
  Si  Si6  1  0.243  0.950  0.190  1.0
  Si  Si7  1  0.384  0.635  0.255  1.0
  Si  Si8  1  0.803  0.610  0.235  1.0
  Si  Si9  1  0.890  0.272  0.141  1.0
  Si  Si10  1  0.110  0.728  0.859  1.0
  Si  Si11  1  0.197  0.390  0.765  1.0
  Si  Si12  1  0.616  0.365  0.745  1.0
  Si  Si13  1  0.757  0.050  0.810  1.0
  O  O14  1  0.232  0.931  0.012  1.0
  O  O15  1  0.133  0.448  0.134  1.0
  O  O16  1  0.405  0.860  0.261  1.0
  O  O17  1  0.567  0.623  0.175  1.0
  O  O18  1  0.979  0.794  0.182  1.0
  O  O19  1  0.722  0.377  0.122  1.0
  O  O20  1  0.432  0.613  0.420  1.0
  O  O21  1  0.347  0.189  0.271  1.0
  O  O22  1  0.082  0.788  0.708  1.0
  O  O23  1  0.110  0.378  0.593  1.0
  O  O24  1  0.890  0.622  0.407  1.0
  O  O25  1  0.918  0.212  0.292  1.0
  O  O26  1  0.653  0.811  0.729  1.0
  O  O27  1  0.568  0.387  0.580  1.0
  O  O28  1  0.278  0.623  0.878  1.0
  O  O29  1  0.021  0.206  0.818  1.0
  O  O30  1  0.433  0.377  0.825  1.0
  O  O31  1  0.595  0.140  0.739  1.0
  O  O32  1  0.867  0.552  0.866  1.0
  O  O33  1  0.768  0.069  0.988  1.0
[/CIF]
.