The structure described by Li2CoSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. Co(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Co(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra, corners with two equivalent O(3)Li2CoSi trigonal pyramids, and  an edgeedge with one O(3)Li2CoSi trigonal pyramid. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form OLi2CoSi tetrahedra that share corners with four equivalent O(1)Li3Si tetrahedra, corners with four equivalent O(4)LiCo2Si tetrahedra, and corners with four equivalent O(3)Li2CoSi trigonal pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form distorted OLi2CoSi trigonal pyramids that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra,  an edgeedge with one O(1)Li3Si tetrahedra, and  an edgeedge with one O(4)LiCo2Si tetrahedra. In the fourth O site, O(4) is bonded to one Li(2), two equivalent Co(1), and one Si(1) atom to form OLiCo2Si tetrahedra that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra, corners with two equivalent O(3)Li2CoSi trigonal pyramids, and  an edgeedge with one O(3)Li2CoSi trigonal pyramid. is represented by the CIF card [CIF]
data_Li2CoSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.096
_cell_length_b   6.368
_cell_length_c   10.772
_cell_angle_alpha   89.387
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   349.566
_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  0.193  0.004  0.831  1.0
  Li  Li1  1  0.307  0.004  0.331  1.0
  Li  Li2  1  0.303  0.226  0.573  1.0
  Li  Li3  1  0.197  0.226  0.073  1.0
  Li  Li4  1  0.803  0.774  0.927  1.0
  Li  Li5  1  0.697  0.774  0.427  1.0
  Li  Li6  1  0.693  0.996  0.669  1.0
  Li  Li7  1  0.807  0.996  0.169  1.0
  Co  Co8  1  0.195  0.500  0.839  1.0
  Co  Co9  1  0.695  0.500  0.661  1.0
  Co  Co10  1  0.305  0.500  0.339  1.0
  Co  Co11  1  0.805  0.500  0.161  1.0
  Si  Si12  1  0.692  0.245  0.912  1.0
  Si  Si13  1  0.808  0.245  0.412  1.0
  Si  Si14  1  0.192  0.755  0.588  1.0
  Si  Si15  1  0.308  0.755  0.088  1.0
  O  O16  1  0.803  0.041  0.840  1.0
  O  O17  1  0.697  0.041  0.340  1.0
  O  O18  1  0.367  0.251  0.910  1.0
  O  O19  1  0.700  0.250  0.556  1.0
  O  O20  1  0.133  0.251  0.410  1.0
  O  O21  1  0.795  0.468  0.840  1.0
  O  O22  1  0.800  0.250  0.056  1.0
  O  O23  1  0.705  0.468  0.340  1.0
  O  O24  1  0.295  0.532  0.660  1.0
  O  O25  1  0.200  0.750  0.944  1.0
  O  O26  1  0.205  0.532  0.160  1.0
  O  O27  1  0.867  0.749  0.590  1.0
  O  O28  1  0.300  0.750  0.444  1.0
  O  O29  1  0.633  0.749  0.090  1.0
  O  O30  1  0.303  0.959  0.660  1.0
  O  O31  1  0.197  0.959  0.160  1.0
[/CIF]
.
The structure described by Li2CoSiO4 is beta beryllia-derived structured and crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Co(1)O4 tetrahedra. Co(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form CoO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Co(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(2)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with four equivalent Li(2)O4 tetrahedra, and corners with four equivalent Co(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), two equivalent Li(1), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra, corners with two equivalent O(3)Li2CoSi trigonal pyramids, and  an edgeedge with one O(3)Li2CoSi trigonal pyramid. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form OLi2CoSi tetrahedra that share corners with four equivalent O(1)Li3Si tetrahedra, corners with four equivalent O(4)LiCo2Si tetrahedra, and corners with four equivalent O(3)Li2CoSi trigonal pyramids. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Co(1), and one Si(1) atom to form distorted OLi2CoSi trigonal pyramids that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra,  an edgeedge with one O(1)Li3Si tetrahedra, and  an edgeedge with one O(4)LiCo2Si tetrahedra. In the fourth O site, O(4) is bonded to one Li(2), two equivalent Co(1), and one Si(1) atom to form OLiCo2Si tetrahedra that share corners with two equivalent O(1)Li3Si tetrahedra, corners with two equivalent O(4)LiCo2Si tetrahedra, corners with four equivalent O(2)Li2CoSi tetrahedra, corners with two equivalent O(3)Li2CoSi trigonal pyramids, and  an edgeedge with one O(3)Li2CoSi trigonal pyramid. is represented by the CIF card [CIF]
data_Li2CoSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.096
_cell_length_b   6.368
_cell_length_c   10.772
_cell_angle_alpha   89.387
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   349.566
_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  0.193  0.004  0.831  1.0
  Li  Li1  1  0.307  0.004  0.331  1.0
  Li  Li2  1  0.303  0.226  0.573  1.0
  Li  Li3  1  0.197  0.226  0.073  1.0
  Li  Li4  1  0.803  0.774  0.927  1.0
  Li  Li5  1  0.697  0.774  0.427  1.0
  Li  Li6  1  0.693  0.996  0.669  1.0
  Li  Li7  1  0.807  0.996  0.169  1.0
  Co  Co8  1  0.195  0.500  0.839  1.0
  Co  Co9  1  0.695  0.500  0.661  1.0
  Co  Co10  1  0.305  0.500  0.339  1.0
  Co  Co11  1  0.805  0.500  0.161  1.0
  Si  Si12  1  0.692  0.245  0.912  1.0
  Si  Si13  1  0.808  0.245  0.412  1.0
  Si  Si14  1  0.192  0.755  0.588  1.0
  Si  Si15  1  0.308  0.755  0.088  1.0
  O  O16  1  0.803  0.041  0.840  1.0
  O  O17  1  0.697  0.041  0.340  1.0
  O  O18  1  0.367  0.251  0.910  1.0
  O  O19  1  0.700  0.250  0.556  1.0
  O  O20  1  0.133  0.251  0.410  1.0
  O  O21  1  0.795  0.468  0.840  1.0
  O  O22  1  0.800  0.250  0.056  1.0
  O  O23  1  0.705  0.468  0.340  1.0
  O  O24  1  0.295  0.532  0.660  1.0
  O  O25  1  0.200  0.750  0.944  1.0
  O  O26  1  0.205  0.532  0.160  1.0
  O  O27  1  0.867  0.749  0.590  1.0
  O  O28  1  0.300  0.750  0.444  1.0
  O  O29  1  0.633  0.749  0.090  1.0
  O  O30  1  0.303  0.959  0.660  1.0
  O  O31  1  0.197  0.959  0.160  1.0
[/CIF]
.