The material structure described by Li2MgCu2(SiO3)4 crystallizes in the triclinic P-1 space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(6) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with four equivalent Cu(1)O5 square pyramids. Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(2) atoms to form distorted CuO5 square pyramids that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and  an edgeedge with one Cu(1)O5 square pyramid. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Cu(1)O5 square pyramids, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-52°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Mg(1), one Cu(1), and one Si(1) atom to form corner-sharing OLiMgCuSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Cu(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(1), one Si(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2MgCu2(SiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.261
_cell_length_b   5.768
_cell_length_c   7.549
_cell_angle_alpha   84.535
_cell_angle_beta   80.073
_cell_angle_gamma   82.900
_symmetry_Int_Tables_number   1
_cell_volume   223.298
_cell_formula_units_Z   1
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  0.927  0.757  0.410  1.0
  Li  Li1  1  0.073  0.243  0.590  1.0
  Mg  Mg2  1  0.000  0.000  0.000  1.0
  Cu  Cu3  1  0.492  0.836  0.184  1.0
  Cu  Cu4  1  0.508  0.164  0.816  1.0
  Si  Si5  1  0.301  0.777  0.627  1.0
  Si  Si6  1  0.779  0.590  0.814  1.0
  Si  Si7  1  0.221  0.410  0.186  1.0
  Si  Si8  1  0.699  0.223  0.373  1.0
  O  O9  1  0.229  1.000  0.752  1.0
  O  O10  1  0.771  0.000  0.248  1.0
  O  O11  1  0.732  0.801  0.947  1.0
  O  O12  1  0.275  0.864  0.421  1.0
  O  O13  1  0.587  0.640  0.656  1.0
  O  O14  1  0.236  0.676  0.096  1.0
  O  O15  1  0.075  0.589  0.689  1.0
  O  O16  1  0.925  0.411  0.311  1.0
  O  O17  1  0.764  0.324  0.904  1.0
  O  O18  1  0.413  0.360  0.344  1.0
  O  O19  1  0.725  0.136  0.579  1.0
  O  O20  1  0.268  0.199  0.053  1.0
[/CIF]
.
The material structure described by Li2MgCu2(SiO3)4 crystallizes in the triclinic P-1 space group. Li(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), and two equivalent O(6) atoms. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with four equivalent Cu(1)O5 square pyramids. Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(2) atoms to form distorted CuO5 square pyramids that share corners with two equivalent Si(1)O4 tetrahedra, corners with three equivalent Si(2)O4 tetrahedra, edges with two equivalent Mg(1)O6 octahedra, and  an edgeedge with one Cu(1)O5 square pyramid. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Cu(1)O5 square pyramids, and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent Cu(1)O5 square pyramids, and corners with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-52°. There are six inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Mg(1), one Cu(1), and one Si(1) atom to form corner-sharing OLiMgCuSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent Cu(1), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(1), one Si(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2MgCu2(SiO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.261
_cell_length_b   5.768
_cell_length_c   7.549
_cell_angle_alpha   84.535
_cell_angle_beta   80.073
_cell_angle_gamma   82.900
_symmetry_Int_Tables_number   1
_cell_volume   223.298
_cell_formula_units_Z   1
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  0.927  0.757  0.410  1.0
  Li  Li1  1  0.073  0.243  0.590  1.0
  Mg  Mg2  1  0.000  0.000  0.000  1.0
  Cu  Cu3  1  0.492  0.836  0.184  1.0
  Cu  Cu4  1  0.508  0.164  0.816  1.0
  Si  Si5  1  0.301  0.777  0.627  1.0
  Si  Si6  1  0.779  0.590  0.814  1.0
  Si  Si7  1  0.221  0.410  0.186  1.0
  Si  Si8  1  0.699  0.223  0.373  1.0
  O  O9  1  0.229  1.000  0.752  1.0
  O  O10  1  0.771  0.000  0.248  1.0
  O  O11  1  0.732  0.801  0.947  1.0
  O  O12  1  0.275  0.864  0.421  1.0
  O  O13  1  0.587  0.640  0.656  1.0
  O  O14  1  0.236  0.676  0.096  1.0
  O  O15  1  0.075  0.589  0.689  1.0
  O  O16  1  0.925  0.411  0.311  1.0
  O  O17  1  0.764  0.324  0.904  1.0
  O  O18  1  0.413  0.360  0.344  1.0
  O  O19  1  0.725  0.136  0.579  1.0
  O  O20  1  0.268  0.199  0.053  1.0
[/CIF]
.