The structure described by Li2CuSiO4 crystallizes in the trigonal P3_121 space group. Li(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with eight equivalent Li(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Cu(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CuSi tetrahedra. In the second O site, O(2) is bonded to two equivalent Li(1), one Cu(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CuSi tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CuSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.042
_cell_length_b   5.042
_cell_length_c   11.421
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   251.417
_cell_formula_units_Z   3
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  0.341  0.896  0.586  1.0
  Li  Li1  1  0.104  0.445  0.919  1.0
  Li  Li2  1  0.555  0.659  0.253  1.0
  Li  Li3  1  0.445  0.104  0.081  1.0
  Li  Li4  1  0.659  0.555  0.747  1.0
  Li  Li5  1  0.896  0.341  0.414  1.0
  Cu  Cu6  1  0.000  0.450  0.167  1.0
  Cu  Cu7  1  0.550  0.550  0.500  1.0
  Cu  Cu8  1  0.450  0.000  0.833  1.0
  Si  Si9  1  0.000  0.190  0.667  1.0
  Si  Si10  1  0.190  0.000  0.333  1.0
  Si  Si11  1  0.810  0.810  0.000  1.0
  O  O12  1  0.141  0.854  0.957  1.0
  O  O13  1  0.134  0.443  0.559  1.0
  O  O14  1  0.309  0.866  0.226  1.0
  O  O15  1  0.146  0.287  0.290  1.0
  O  O16  1  0.287  0.146  0.710  1.0
  O  O17  1  0.713  0.859  0.623  1.0
  O  O18  1  0.557  0.691  0.892  1.0
  O  O19  1  0.691  0.557  0.108  1.0
  O  O20  1  0.443  0.134  0.441  1.0
  O  O21  1  0.859  0.713  0.377  1.0
  O  O22  1  0.854  0.141  0.043  1.0
  O  O23  1  0.866  0.309  0.774  1.0
[/CIF]
.
The structure described by Li2CuSiO4 crystallizes in the trigonal P3_121 space group. Li(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra and corners with four equivalent Si(1)O4 tetrahedra. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with eight equivalent Li(1)O4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), one Cu(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CuSi tetrahedra. In the second O site, O(2) is bonded to two equivalent Li(1), one Cu(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2CuSi tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2CuSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.042
_cell_length_b   5.042
_cell_length_c   11.421
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   251.417
_cell_formula_units_Z   3
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  0.341  0.896  0.586  1.0
  Li  Li1  1  0.104  0.445  0.919  1.0
  Li  Li2  1  0.555  0.659  0.253  1.0
  Li  Li3  1  0.445  0.104  0.081  1.0
  Li  Li4  1  0.659  0.555  0.747  1.0
  Li  Li5  1  0.896  0.341  0.414  1.0
  Cu  Cu6  1  0.000  0.450  0.167  1.0
  Cu  Cu7  1  0.550  0.550  0.500  1.0
  Cu  Cu8  1  0.450  0.000  0.833  1.0
  Si  Si9  1  0.000  0.190  0.667  1.0
  Si  Si10  1  0.190  0.000  0.333  1.0
  Si  Si11  1  0.810  0.810  0.000  1.0
  O  O12  1  0.141  0.854  0.957  1.0
  O  O13  1  0.134  0.443  0.559  1.0
  O  O14  1  0.309  0.866  0.226  1.0
  O  O15  1  0.146  0.287  0.290  1.0
  O  O16  1  0.287  0.146  0.710  1.0
  O  O17  1  0.713  0.859  0.623  1.0
  O  O18  1  0.557  0.691  0.892  1.0
  O  O19  1  0.691  0.557  0.108  1.0
  O  O20  1  0.443  0.134  0.441  1.0
  O  O21  1  0.859  0.713  0.377  1.0
  O  O22  1  0.854  0.141  0.043  1.0
  O  O23  1  0.866  0.309  0.774  1.0
[/CIF]
.