The compound described by Ca3Er3BGe2O13 crystallizes in the monoclinic C2 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted CaO7 pentagonal bipyramids that share  a cornercorner with one Ca(1)O7 pentagonal bipyramid,  a cornercorner with one Er(2)O7 pentagonal bipyramid, corners with two equivalent Er(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra,  a faceface with one Er(2)O7 pentagonal bipyramid, and faces with two equivalent Er(1)O7 pentagonal bipyramids. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted ErO7 pentagonal bipyramids that share  a cornercorner with one Er(1)O7 pentagonal bipyramid,  a cornercorner with one Er(2)O7 pentagonal bipyramid, corners with two equivalent Ca(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra,  a faceface with one Er(2)O7 pentagonal bipyramid, and faces with two equivalent Ca(1)O7 pentagonal bipyramids. In the second Er site, Er(2) is bonded to one O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted ErO7 pentagonal bipyramids that share corners with two equivalent Ca(1)O7 pentagonal bipyramids, corners with two equivalent Er(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra, faces with two equivalent Ca(1)O7 pentagonal bipyramids, and faces with two equivalent Er(1)O7 pentagonal bipyramids. B(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form BO4 tetrahedra that share  an edgeedge with one Er(2)O7 pentagonal bipyramid, edges with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with two equivalent Er(1)O7 pentagonal bipyramids. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(6) and two equivalent O(7) atoms to form GeO4 tetrahedra that share corners with two equivalent Er(2)O7 pentagonal bipyramids, corners with four equivalent Ca(1)O7 pentagonal bipyramids, and corners with four equivalent Er(1)O7 pentagonal bipyramids. In the second Ge site, Ge(2) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form GeO4 tetrahedra that share corners with two equivalent Er(2)O7 pentagonal bipyramids, corners with four equivalent Ca(1)O7 pentagonal bipyramids, and corners with four equivalent Er(1)O7 pentagonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Ca(2), two equivalent Ca(1), one Er(2), and two equivalent Er(1) atoms to form OCa3Er3 octahedra that share corners with six equivalent O(2)Ca2ErB trigonal pyramids and corners with six equivalent O(3)CaEr2B trigonal pyramids. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Er(1), and one B(1) atom to form distorted OCa2ErB trigonal pyramids that share corners with three equivalent O(1)Ca3Er3 octahedra,  an edgeedge with one O(2)Ca2ErB trigonal pyramid, and edges with two equivalent O(3)CaEr2B trigonal pyramids. The corner-sharing octahedral tilt angles range from 31-33°. In the third O site, O(3) is bonded to one Ca(1), one Er(1), one Er(2), and one B(1) atom to form distorted OCaEr2B trigonal pyramids that share corners with three equivalent O(1)Ca3Er3 octahedra,  an edgeedge with one O(3)CaEr2B trigonal pyramid, and edges with two equivalent O(2)Ca2ErB trigonal pyramids. The corner-sharing octahedral tilt angles range from 30-32°. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Er(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Er(1), one Er(2), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Er(1), one Er(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Er(1), and one Ge(1) atom. is represented by the CIF card [CIF]
data_Ca3Er3Ge2BO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.389
_cell_length_b   7.389
_cell_length_c   7.392
_cell_angle_alpha   60.276
_cell_angle_beta   60.276
_cell_angle_gamma   90.372
_symmetry_Int_Tables_number   1
_cell_volume   286.845
_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
  Ca  Ca0  1  0.771  0.767  0.462  1.0
  Ca  Ca1  1  0.231  0.769  0.000  1.0
  Ca  Ca2  1  0.233  0.229  0.538  1.0
  Er  Er3  1  0.229  0.224  0.999  1.0
  Er  Er4  1  0.774  0.226  0.000  1.0
  Er  Er5  1  0.776  0.771  0.001  1.0
  Ge  Ge6  1  0.747  0.253  0.500  1.0
  Ge  Ge7  1  0.247  0.753  0.500  1.0
  B  B8  1  0.503  0.497  0.000  1.0
  O  O9  1  0.992  0.008  0.000  1.0
  O  O10  1  0.415  0.569  0.843  1.0
  O  O11  1  0.425  0.250  0.157  1.0
  O  O12  1  0.431  0.585  0.157  1.0
  O  O13  1  0.750  0.575  0.843  1.0
  O  O14  1  0.154  0.858  0.298  1.0
  O  O15  1  0.146  0.453  0.706  1.0
  O  O16  1  0.142  0.846  0.702  1.0
  O  O17  1  0.547  0.854  0.294  1.0
  O  O18  1  0.838  0.149  0.704  1.0
  O  O19  1  0.842  0.545  0.298  1.0
  O  O20  1  0.851  0.162  0.296  1.0
  O  O21  1  0.455  0.158  0.702  1.0
[/CIF]
.
The compound described by Ca3Er3BGe2O13 crystallizes in the monoclinic C2 space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted CaO7 pentagonal bipyramids that share  a cornercorner with one Ca(1)O7 pentagonal bipyramid,  a cornercorner with one Er(2)O7 pentagonal bipyramid, corners with two equivalent Er(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra,  a faceface with one Er(2)O7 pentagonal bipyramid, and faces with two equivalent Er(1)O7 pentagonal bipyramids. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form distorted ErO7 pentagonal bipyramids that share  a cornercorner with one Er(1)O7 pentagonal bipyramid,  a cornercorner with one Er(2)O7 pentagonal bipyramid, corners with two equivalent Ca(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra,  a faceface with one Er(2)O7 pentagonal bipyramid, and faces with two equivalent Ca(1)O7 pentagonal bipyramids. In the second Er site, Er(2) is bonded to one O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form distorted ErO7 pentagonal bipyramids that share corners with two equivalent Ca(1)O7 pentagonal bipyramids, corners with two equivalent Er(1)O7 pentagonal bipyramids, corners with two equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O4 tetrahedra,  an edgeedge with one B(1)O4 tetrahedra, faces with two equivalent Ca(1)O7 pentagonal bipyramids, and faces with two equivalent Er(1)O7 pentagonal bipyramids. B(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form BO4 tetrahedra that share  an edgeedge with one Er(2)O7 pentagonal bipyramid, edges with two equivalent Ca(1)O7 pentagonal bipyramids, and edges with two equivalent Er(1)O7 pentagonal bipyramids. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to two equivalent O(6) and two equivalent O(7) atoms to form GeO4 tetrahedra that share corners with two equivalent Er(2)O7 pentagonal bipyramids, corners with four equivalent Ca(1)O7 pentagonal bipyramids, and corners with four equivalent Er(1)O7 pentagonal bipyramids. In the second Ge site, Ge(2) is bonded to two equivalent O(4) and two equivalent O(5) atoms to form GeO4 tetrahedra that share corners with two equivalent Er(2)O7 pentagonal bipyramids, corners with four equivalent Ca(1)O7 pentagonal bipyramids, and corners with four equivalent Er(1)O7 pentagonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Ca(2), two equivalent Ca(1), one Er(2), and two equivalent Er(1) atoms to form OCa3Er3 octahedra that share corners with six equivalent O(2)Ca2ErB trigonal pyramids and corners with six equivalent O(3)CaEr2B trigonal pyramids. In the second O site, O(2) is bonded to one Ca(1), one Ca(2), one Er(1), and one B(1) atom to form distorted OCa2ErB trigonal pyramids that share corners with three equivalent O(1)Ca3Er3 octahedra,  an edgeedge with one O(2)Ca2ErB trigonal pyramid, and edges with two equivalent O(3)CaEr2B trigonal pyramids. The corner-sharing octahedral tilt angles range from 31-33°. In the third O site, O(3) is bonded to one Ca(1), one Er(1), one Er(2), and one B(1) atom to form distorted OCaEr2B trigonal pyramids that share corners with three equivalent O(1)Ca3Er3 octahedra,  an edgeedge with one O(3)CaEr2B trigonal pyramid, and edges with two equivalent O(2)Ca2ErB trigonal pyramids. The corner-sharing octahedral tilt angles range from 30-32°. In the fourth O site, O(4) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Er(1), and one Ge(2) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Er(1), one Er(2), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Er(1), one Er(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Ca(1), one Ca(2), one Er(1), and one Ge(1) atom. is represented by the CIF card [CIF]
data_Ca3Er3Ge2BO13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.389
_cell_length_b   7.389
_cell_length_c   7.392
_cell_angle_alpha   60.276
_cell_angle_beta   60.276
_cell_angle_gamma   90.372
_symmetry_Int_Tables_number   1
_cell_volume   286.845
_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
  Ca  Ca0  1  0.771  0.767  0.462  1.0
  Ca  Ca1  1  0.231  0.769  0.000  1.0
  Ca  Ca2  1  0.233  0.229  0.538  1.0
  Er  Er3  1  0.229  0.224  0.999  1.0
  Er  Er4  1  0.774  0.226  0.000  1.0
  Er  Er5  1  0.776  0.771  0.001  1.0
  Ge  Ge6  1  0.747  0.253  0.500  1.0
  Ge  Ge7  1  0.247  0.753  0.500  1.0
  B  B8  1  0.503  0.497  0.000  1.0
  O  O9  1  0.992  0.008  0.000  1.0
  O  O10  1  0.415  0.569  0.843  1.0
  O  O11  1  0.425  0.250  0.157  1.0
  O  O12  1  0.431  0.585  0.157  1.0
  O  O13  1  0.750  0.575  0.843  1.0
  O  O14  1  0.154  0.858  0.298  1.0
  O  O15  1  0.146  0.453  0.706  1.0
  O  O16  1  0.142  0.846  0.702  1.0
  O  O17  1  0.547  0.854  0.294  1.0
  O  O18  1  0.838  0.149  0.704  1.0
  O  O19  1  0.842  0.545  0.298  1.0
  O  O20  1  0.851  0.162  0.296  1.0
  O  O21  1  0.455  0.158  0.702  1.0
[/CIF]
.