The structure described by Li2Ca4Si4O13 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 4-coordinate geometry to one O(1), one O(12), one O(4), and one O(5) atom. In the second Li site, Li(2) is bonded to one O(10), one O(13), one O(3), and one O(9) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Ca(2)O6 octahedra,  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, and  an edgeedge with one Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 78-86°. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(6), and two equivalent O(11) atoms. In the second Ca site, Ca(2) is bonded to one O(10), one O(13), one O(3), one O(8), and two equivalent O(7) atoms to form CaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(2)O6 octahedra, edges with three equivalent Ca(4)O6 octahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. In the third Ca site, Ca(3) is bonded to one O(1), one O(11), one O(5), one O(9), and two equivalent O(6) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. In the fourth Ca site, Ca(4) is bonded to one O(13), one O(3), one O(7), one O(9), and two equivalent O(8) atoms to form CaO6 octahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(4)O6 octahedra, edges with three equivalent Ca(2)O6 octahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 55°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-73°. In the second Si site, Si(2) is bonded to one O(10), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Ca(4)O6 octahedra, corners with three equivalent Li(2)O4 trigonal pyramids, and  an edgeedge with one Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the third Si site, Si(3) is bonded to one O(1), one O(12), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra,  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Li(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 56-59°. In the fourth Si site, Si(4) is bonded to one O(11), one O(2), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra, corners with two equivalent Ca(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-67°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Ca(1), one Ca(3), and one Si(3) atom to form distorted OLiCa2Si tetrahedra that share  a cornercorner with one O(3)LiCa2Si tetrahedra, corners with three equivalent O(6)Ca3Si tetrahedra, and  a cornercorner with one O(10)LiCa2Si trigonal pyramid. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Si(3), and one Si(4) atom. In the third O site, O(3) is bonded to one Li(2), one Ca(2), one Ca(4), and one Si(3) atom to form distorted OLiCa2Si tetrahedra that share  a cornercorner with one O(1)LiCa2Si tetrahedra, corners with three equivalent O(7)Ca3Si tetrahedra, corners with two equivalent O(10)LiCa2Si trigonal pyramids, and corners with three equivalent O(13)LiCa2Si trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ca(1), one Ca(3), and one Si(2) atom. In the sixth O site, O(6) is bonded to one Ca(1), two equivalent Ca(3), and one Si(1) atom to form distorted OCa3Si tetrahedra that share corners with three equivalent O(1)LiCa2Si tetrahedra,  a cornercorner with one O(10)LiCa2Si trigonal pyramid, and  an edgeedge with one O(6)Ca3Si tetrahedra. In the seventh O site, O(7) is bonded to one Ca(4), two equivalent Ca(2), and one Si(4) atom to form distorted OCa3Si tetrahedra that share corners with three equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(13)LiCa2Si trigonal pyramid, corners with two equivalent O(10)LiCa2Si trigonal pyramids,  an edgeedge with one O(7)Ca3Si tetrahedra, and  an edgeedge with one O(13)LiCa2Si trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(4), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Ca(3), one Ca(4), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Li(2), one Ca(1), one Ca(2), and one Si(2) atom to form distorted OLiCa2Si trigonal pyramids that share  a cornercorner with one O(6)Ca3Si tetrahedra,  a cornercorner with one O(1)LiCa2Si tetrahedra, corners with two equivalent O(7)Ca3Si tetrahedra, corners with two equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(13)LiCa2Si trigonal pyramid, and  an edgeedge with one O(13)LiCa2Si trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(1), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Li(1), one Si(1), and one Si(3) atom. In the thirteenth O site, O(13) is bonded to one Li(2), one Ca(2), one Ca(4), and one Si(2) atom to form distorted OLiCa2Si trigonal pyramids that share  a cornercorner with one O(7)Ca3Si tetrahedra, corners with three equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(10)LiCa2Si trigonal pyramid,  an edgeedge with one O(7)Ca3Si tetrahedra, and  an edgeedge with one O(10)LiCa2Si trigonal pyramid. is represented by the CIF card [CIF]
data_Li2Ca4Si4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.227
_cell_length_b   8.313
_cell_length_c   10.576
_cell_angle_alpha   109.271
_cell_angle_beta   89.893
_cell_angle_gamma   102.196
_symmetry_Int_Tables_number   1
_cell_volume   584.686
_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  0.252  0.409  0.409  1.0
  Li  Li1  1  0.771  0.576  0.112  1.0
  Li  Li2  1  0.748  0.591  0.591  1.0
  Li  Li3  1  0.229  0.424  0.888  1.0
  Ca  Ca4  1  0.925  0.211  0.599  1.0
  Ca  Ca5  1  0.917  0.196  0.997  1.0
  Ca  Ca6  1  0.075  0.789  0.401  1.0
  Ca  Ca7  1  0.429  0.207  0.607  1.0
  Ca  Ca8  1  0.083  0.804  0.003  1.0
  Ca  Ca9  1  0.430  0.198  0.994  1.0
  Ca  Ca10  1  0.571  0.793  0.393  1.0
  Ca  Ca11  1  0.570  0.802  0.006  1.0
  Si  Si12  1  0.362  0.093  0.280  1.0
  Si  Si13  1  0.267  0.574  0.178  1.0
  Si  Si14  1  0.716  0.383  0.303  1.0
  Si  Si15  1  0.284  0.617  0.697  1.0
  Si  Si16  1  0.733  0.426  0.822  1.0
  Si  Si17  1  0.925  0.084  0.278  1.0
  Si  Si18  1  0.075  0.916  0.722  1.0
  Si  Si19  1  0.638  0.907  0.720  1.0
  O  O20  1  0.227  0.412  0.601  1.0
  O  O21  1  0.858  0.272  0.346  1.0
  O  O22  1  0.716  0.353  0.143  1.0
  O  O23  1  0.158  0.159  0.302  1.0
  O  O24  1  0.729  0.411  0.661  1.0
  O  O25  1  0.620  0.009  0.616  1.0
  O  O26  1  0.866  0.991  0.119  1.0
  O  O27  1  0.284  0.647  0.857  1.0
  O  O28  1  0.618  0.997  0.878  1.0
  O  O29  1  0.489  0.667  0.160  1.0
  O  O30  1  0.902  0.322  0.835  1.0
  O  O31  1  0.773  0.588  0.399  1.0
  O  O32  1  0.134  0.009  0.881  1.0
  O  O33  1  0.142  0.728  0.654  1.0
  O  O34  1  0.511  0.333  0.840  1.0
  O  O35  1  0.382  0.003  0.122  1.0
  O  O36  1  0.135  0.033  0.626  1.0
  O  O37  1  0.503  0.295  0.343  1.0
  O  O38  1  0.380  0.991  0.384  1.0
  O  O39  1  0.214  0.377  0.065  1.0
  O  O40  1  0.497  0.705  0.657  1.0
  O  O41  1  0.865  0.967  0.374  1.0
  O  O42  1  0.271  0.589  0.339  1.0
  O  O43  1  0.842  0.841  0.698  1.0
  O  O44  1  0.786  0.623  0.935  1.0
  O  O45  1  0.098  0.678  0.165  1.0
[/CIF]
.
The structure described by Li2Ca4Si4O13 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 4-coordinate geometry to one O(1), one O(12), one O(4), and one O(5) atom. In the second Li site, Li(2) is bonded to one O(10), one O(13), one O(3), and one O(9) atom to form distorted LiO4 trigonal pyramids that share  a cornercorner with one Ca(2)O6 octahedra,  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra,  an edgeedge with one Ca(2)O6 octahedra, and  an edgeedge with one Ca(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 78-86°. There are four inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(6), and two equivalent O(11) atoms. In the second Ca site, Ca(2) is bonded to one O(10), one O(13), one O(3), one O(8), and two equivalent O(7) atoms to form CaO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(2)O6 octahedra, edges with three equivalent Ca(4)O6 octahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. In the third Ca site, Ca(3) is bonded to one O(1), one O(11), one O(5), one O(9), and two equivalent O(6) atoms to form distorted CaO6 octahedra that share  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(3)O6 octahedra, and  an edgeedge with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. In the fourth Ca site, Ca(4) is bonded to one O(13), one O(3), one O(7), one O(9), and two equivalent O(8) atoms to form CaO6 octahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Li(2)O4 trigonal pyramid,  an edgeedge with one Ca(4)O6 octahedra, edges with three equivalent Ca(2)O6 octahedra, and  an edgeedge with one Li(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 55°. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra, corners with two equivalent Ca(3)O6 octahedra, corners with two equivalent Ca(4)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-73°. In the second Si site, Si(2) is bonded to one O(10), one O(13), one O(5), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Ca(2)O6 octahedra, corners with two equivalent Ca(4)O6 octahedra, corners with three equivalent Li(2)O4 trigonal pyramids, and  an edgeedge with one Ca(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-56°. In the third Si site, Si(3) is bonded to one O(1), one O(12), one O(2), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(2)O6 octahedra,  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Li(2)O4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 56-59°. In the fourth Si site, Si(4) is bonded to one O(11), one O(2), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Ca(3)O6 octahedra,  a cornercorner with one Ca(4)O6 octahedra, corners with two equivalent Ca(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-67°. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Ca(1), one Ca(3), and one Si(3) atom to form distorted OLiCa2Si tetrahedra that share  a cornercorner with one O(3)LiCa2Si tetrahedra, corners with three equivalent O(6)Ca3Si tetrahedra, and  a cornercorner with one O(10)LiCa2Si trigonal pyramid. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ca(1), one Si(3), and one Si(4) atom. In the third O site, O(3) is bonded to one Li(2), one Ca(2), one Ca(4), and one Si(3) atom to form distorted OLiCa2Si tetrahedra that share  a cornercorner with one O(1)LiCa2Si tetrahedra, corners with three equivalent O(7)Ca3Si tetrahedra, corners with two equivalent O(10)LiCa2Si trigonal pyramids, and corners with three equivalent O(13)LiCa2Si trigonal pyramids. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), one Ca(1), one Ca(3), and one Si(2) atom. In the sixth O site, O(6) is bonded to one Ca(1), two equivalent Ca(3), and one Si(1) atom to form distorted OCa3Si tetrahedra that share corners with three equivalent O(1)LiCa2Si tetrahedra,  a cornercorner with one O(10)LiCa2Si trigonal pyramid, and  an edgeedge with one O(6)Ca3Si tetrahedra. In the seventh O site, O(7) is bonded to one Ca(4), two equivalent Ca(2), and one Si(4) atom to form distorted OCa3Si tetrahedra that share corners with three equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(13)LiCa2Si trigonal pyramid, corners with two equivalent O(10)LiCa2Si trigonal pyramids,  an edgeedge with one O(7)Ca3Si tetrahedra, and  an edgeedge with one O(13)LiCa2Si trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Ca(2), two equivalent Ca(4), and one Si(1) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Li(2), one Ca(3), one Ca(4), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Li(2), one Ca(1), one Ca(2), and one Si(2) atom to form distorted OLiCa2Si trigonal pyramids that share  a cornercorner with one O(6)Ca3Si tetrahedra,  a cornercorner with one O(1)LiCa2Si tetrahedra, corners with two equivalent O(7)Ca3Si tetrahedra, corners with two equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(13)LiCa2Si trigonal pyramid, and  an edgeedge with one O(13)LiCa2Si trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(3), two equivalent Ca(1), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Li(1), one Si(1), and one Si(3) atom. In the thirteenth O site, O(13) is bonded to one Li(2), one Ca(2), one Ca(4), and one Si(2) atom to form distorted OLiCa2Si trigonal pyramids that share  a cornercorner with one O(7)Ca3Si tetrahedra, corners with three equivalent O(3)LiCa2Si tetrahedra,  a cornercorner with one O(10)LiCa2Si trigonal pyramid,  an edgeedge with one O(7)Ca3Si tetrahedra, and  an edgeedge with one O(10)LiCa2Si trigonal pyramid. is represented by the CIF card [CIF]
data_Li2Ca4Si4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.227
_cell_length_b   8.313
_cell_length_c   10.576
_cell_angle_alpha   109.271
_cell_angle_beta   89.893
_cell_angle_gamma   102.196
_symmetry_Int_Tables_number   1
_cell_volume   584.686
_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  0.252  0.409  0.409  1.0
  Li  Li1  1  0.771  0.576  0.112  1.0
  Li  Li2  1  0.748  0.591  0.591  1.0
  Li  Li3  1  0.229  0.424  0.888  1.0
  Ca  Ca4  1  0.925  0.211  0.599  1.0
  Ca  Ca5  1  0.917  0.196  0.997  1.0
  Ca  Ca6  1  0.075  0.789  0.401  1.0
  Ca  Ca7  1  0.429  0.207  0.607  1.0
  Ca  Ca8  1  0.083  0.804  0.003  1.0
  Ca  Ca9  1  0.430  0.198  0.994  1.0
  Ca  Ca10  1  0.571  0.793  0.393  1.0
  Ca  Ca11  1  0.570  0.802  0.006  1.0
  Si  Si12  1  0.362  0.093  0.280  1.0
  Si  Si13  1  0.267  0.574  0.178  1.0
  Si  Si14  1  0.716  0.383  0.303  1.0
  Si  Si15  1  0.284  0.617  0.697  1.0
  Si  Si16  1  0.733  0.426  0.822  1.0
  Si  Si17  1  0.925  0.084  0.278  1.0
  Si  Si18  1  0.075  0.916  0.722  1.0
  Si  Si19  1  0.638  0.907  0.720  1.0
  O  O20  1  0.227  0.412  0.601  1.0
  O  O21  1  0.858  0.272  0.346  1.0
  O  O22  1  0.716  0.353  0.143  1.0
  O  O23  1  0.158  0.159  0.302  1.0
  O  O24  1  0.729  0.411  0.661  1.0
  O  O25  1  0.620  0.009  0.616  1.0
  O  O26  1  0.866  0.991  0.119  1.0
  O  O27  1  0.284  0.647  0.857  1.0
  O  O28  1  0.618  0.997  0.878  1.0
  O  O29  1  0.489  0.667  0.160  1.0
  O  O30  1  0.902  0.322  0.835  1.0
  O  O31  1  0.773  0.588  0.399  1.0
  O  O32  1  0.134  0.009  0.881  1.0
  O  O33  1  0.142  0.728  0.654  1.0
  O  O34  1  0.511  0.333  0.840  1.0
  O  O35  1  0.382  0.003  0.122  1.0
  O  O36  1  0.135  0.033  0.626  1.0
  O  O37  1  0.503  0.295  0.343  1.0
  O  O38  1  0.380  0.991  0.384  1.0
  O  O39  1  0.214  0.377  0.065  1.0
  O  O40  1  0.497  0.705  0.657  1.0
  O  O41  1  0.865  0.967  0.374  1.0
  O  O42  1  0.271  0.589  0.339  1.0
  O  O43  1  0.842  0.841  0.698  1.0
  O  O44  1  0.786  0.623  0.935  1.0
  O  O45  1  0.098  0.678  0.165  1.0
[/CIF]
.