The material structure described by Er6TeO12 crystallizes in the triclinic P-1 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded to one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form distorted ErO6 pentagonal pyramids that share corners with two equivalent Te(1)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, and edges with two equivalent Er(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 29-30°. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), and two equivalent O(4) atoms. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. Te(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TeO6 octahedra that share corners with four equivalent Er(1)O6 pentagonal pyramids and edges with two equivalent Er(1)O6 pentagonal pyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Er(3), two equivalent Er(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Er(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Er(2), one Er(3), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Er(3) and two equivalent Er(2) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Er(1), one Er(2), and one Er(3) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Er(1), one Er(2), and one Er(3) atom. is represented by the CIF file [CIF]
data_Er6TeO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.713
_cell_length_b   6.414
_cell_length_c   6.572
_cell_angle_alpha   118.134
_cell_angle_beta   104.441
_cell_angle_gamma   79.815
_symmetry_Int_Tables_number   1
_cell_volume   348.794
_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
  Er  Er0  1  0.001  0.704  0.304  1.0
  Er  Er1  1  0.999  0.296  0.696  1.0
  Er  Er2  1  0.661  0.058  0.201  1.0
  Er  Er3  1  0.339  0.942  0.799  1.0
  Er  Er4  1  0.729  0.739  0.603  1.0
  Er  Er5  1  0.271  0.261  0.397  1.0
  Te  Te6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.959  0.927  0.672  1.0
  O  O8  1  0.041  0.073  0.328  1.0
  O  O9  1  0.995  0.673  0.935  1.0
  O  O10  1  0.005  0.327  0.065  1.0
  O  O11  1  0.800  0.029  0.969  1.0
  O  O12  1  0.200  0.971  0.031  1.0
  O  O13  1  0.558  0.839  0.788  1.0
  O  O14  1  0.442  0.161  0.212  1.0
  O  O15  1  0.791  0.371  0.505  1.0
  O  O16  1  0.209  0.629  0.495  1.0
  O  O17  1  0.753  0.789  0.306  1.0
  O  O18  1  0.247  0.211  0.694  1.0
[/CIF]
.
The material structure described by Er6TeO12 crystallizes in the triclinic P-1 space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded to one O(5), one O(6), two equivalent O(1), and two equivalent O(2) atoms to form distorted ErO6 pentagonal pyramids that share corners with two equivalent Te(1)O6 octahedra,  an edgeedge with one Te(1)O6 octahedra, and edges with two equivalent Er(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 29-30°. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one O(3), one O(5), one O(6), and two equivalent O(4) atoms. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. Te(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TeO6 octahedra that share corners with four equivalent Er(1)O6 pentagonal pyramids and edges with two equivalent Er(1)O6 pentagonal pyramids. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Er(3), two equivalent Er(1), and one Te(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Er(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Er(2), one Er(3), and one Te(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Er(3) and two equivalent Er(2) atoms. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Er(1), one Er(2), and one Er(3) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Er(1), one Er(2), and one Er(3) atom. is represented by the CIF file [CIF]
data_Er6TeO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.713
_cell_length_b   6.414
_cell_length_c   6.572
_cell_angle_alpha   118.134
_cell_angle_beta   104.441
_cell_angle_gamma   79.815
_symmetry_Int_Tables_number   1
_cell_volume   348.794
_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
  Er  Er0  1  0.001  0.704  0.304  1.0
  Er  Er1  1  0.999  0.296  0.696  1.0
  Er  Er2  1  0.661  0.058  0.201  1.0
  Er  Er3  1  0.339  0.942  0.799  1.0
  Er  Er4  1  0.729  0.739  0.603  1.0
  Er  Er5  1  0.271  0.261  0.397  1.0
  Te  Te6  1  0.000  0.000  0.000  1.0
  O  O7  1  0.959  0.927  0.672  1.0
  O  O8  1  0.041  0.073  0.328  1.0
  O  O9  1  0.995  0.673  0.935  1.0
  O  O10  1  0.005  0.327  0.065  1.0
  O  O11  1  0.800  0.029  0.969  1.0
  O  O12  1  0.200  0.971  0.031  1.0
  O  O13  1  0.558  0.839  0.788  1.0
  O  O14  1  0.442  0.161  0.212  1.0
  O  O15  1  0.791  0.371  0.505  1.0
  O  O16  1  0.209  0.629  0.495  1.0
  O  O17  1  0.753  0.789  0.306  1.0
  O  O18  1  0.247  0.211  0.694  1.0
[/CIF]
.