The structure described by Rb2Ba8Ca(Sb3O)2 crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(5), and one Sb(6) atom. There are eight inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a single-bond geometry to one Sb(1), one Sb(2), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. In the second Ba site, Ba(2) is bonded in a distorted single-bond geometry to one Sb(2), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. In the third Ba site, Ba(3) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(4), one Sb(6), and one O(1) atom. In the fourth Ba site, Ba(4) is bonded in a distorted single-bond geometry to one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(1) atom. In the fifth Ba site, Ba(5) is bonded in a distorted single-bond geometry to one Sb(2), one Sb(4), one Sb(5), one Sb(6), and one O(1) atom. In the sixth Ba site, Ba(6) is bonded in a 3-coordinate geometry to one Sb(2), one Sb(3), one Sb(5), and one Sb(6) atom. In the seventh Ba site, Ba(7) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(6), and one O(2) atom. In the eighth Ba site, Ba(8) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. Ca(1) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(3), one Sb(5), and one O(1) atom. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one Rb(1), one Rb(2), one Ba(1), one Ba(3), one Ba(7), one Ba(8), and one Ca(1) atom to form distorted SbRb2Ba4Ca pentagonal bipyramids that share  a cornercorner with one O(2)Ba4 tetrahedra, corners with two equivalent O(1)Ba3Ca tetrahedra, and  an edgeedge with one O(2)Ba4 tetrahedra. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(5), one Ba(6), one Ba(7), and one Sb(4) atom. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Rb(1), one Rb(2), one Ba(2), one Ba(4), one Ba(6), one Ba(7), one Ba(8), and one Ca(1) atom. In the fourth Sb site, Sb(4) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Ba(8), and one Sb(2) atom. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(4), one Ba(5), one Ba(6), one Ba(8), and one Ca(1) atom. In the sixth Sb site, Sb(6) is bonded in a 9-coordinate geometry to one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Ba(6), one Ba(7), and one Ba(8) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Ba(3), one Ba(4), one Ba(5), and one Ca(1) atom to form distorted OBa3Ca tetrahedra that share corners with two equivalent Sb(1)Rb2Ba4Ca pentagonal bipyramids. In the second O site, O(2) is bonded to one Ba(1), one Ba(2), one Ba(7), and one Ba(8) atom to form OBa4 tetrahedra that share  a cornercorner with one Sb(1)Rb2Ba4Ca pentagonal bipyramid and  an edgeedge with one Sb(1)Rb2Ba4Ca pentagonal bipyramid. is represented by the CIF file [CIF]
data_Rb2Ba8Ca(Sb3O)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.320
_cell_length_b   9.966
_cell_length_c   10.508
_cell_angle_alpha   116.985
_cell_angle_beta   115.803
_cell_angle_gamma   93.500
_symmetry_Int_Tables_number   1
_cell_volume   741.339
_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
  Rb  Rb0  1  0.044  0.036  0.059  1.0
  Rb  Rb1  1  0.494  0.492  0.002  1.0
  Ba  Ba2  1  0.495  0.690  0.690  1.0
  Ba  Ba3  1  0.197  0.982  0.679  1.0
  Ba  Ba4  1  0.796  0.023  0.339  1.0
  Ba  Ba5  1  0.068  0.491  0.673  1.0
  Ba  Ba6  1  0.512  0.317  0.301  1.0
  Ba  Ba7  1  0.683  0.056  0.698  1.0
  Ba  Ba8  1  0.968  0.518  0.259  1.0
  Ba  Ba9  1  0.279  0.773  0.261  1.0
  Ca  Ca10  1  0.754  0.412  0.744  1.0
  Sb  Sb11  1  0.861  0.723  0.060  1.0
  Sb  Sb12  1  0.625  0.106  0.011  1.0
  Sb  Sb13  1  0.082  0.330  0.933  1.0
  Sb  Sb14  1  0.383  0.892  0.001  1.0
  Sb  Sb15  1  0.340  0.254  0.541  1.0
  Sb  Sb16  1  0.753  0.722  0.484  1.0
  O  O17  1  0.776  0.312  0.519  1.0
  O  O18  1  0.254  0.741  0.483  1.0
[/CIF]
.
The structure described by Rb2Ba8Ca(Sb3O)2 crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), and one Sb(5) atom. In the second Rb site, Rb(2) is bonded in a 4-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(4), one Sb(5), and one Sb(6) atom. There are eight inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a single-bond geometry to one Sb(1), one Sb(2), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. In the second Ba site, Ba(2) is bonded in a distorted single-bond geometry to one Sb(2), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. In the third Ba site, Ba(3) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(4), one Sb(6), and one O(1) atom. In the fourth Ba site, Ba(4) is bonded in a distorted single-bond geometry to one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(1) atom. In the fifth Ba site, Ba(5) is bonded in a distorted single-bond geometry to one Sb(2), one Sb(4), one Sb(5), one Sb(6), and one O(1) atom. In the sixth Ba site, Ba(6) is bonded in a 3-coordinate geometry to one Sb(2), one Sb(3), one Sb(5), and one Sb(6) atom. In the seventh Ba site, Ba(7) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(6), and one O(2) atom. In the eighth Ba site, Ba(8) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and one O(2) atom. Ca(1) is bonded in a distorted single-bond geometry to one Sb(1), one Sb(3), one Sb(5), and one O(1) atom. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one Rb(1), one Rb(2), one Ba(1), one Ba(3), one Ba(7), one Ba(8), and one Ca(1) atom to form distorted SbRb2Ba4Ca pentagonal bipyramids that share  a cornercorner with one O(2)Ba4 tetrahedra, corners with two equivalent O(1)Ba3Ca tetrahedra, and  an edgeedge with one O(2)Ba4 tetrahedra. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(5), one Ba(6), one Ba(7), and one Sb(4) atom. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Rb(1), one Rb(2), one Ba(2), one Ba(4), one Ba(6), one Ba(7), one Ba(8), and one Ca(1) atom. In the fourth Sb site, Sb(4) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Ba(8), and one Sb(2) atom. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to one Rb(1), one Rb(2), one Ba(1), one Ba(2), one Ba(4), one Ba(5), one Ba(6), one Ba(8), and one Ca(1) atom. In the sixth Sb site, Sb(6) is bonded in a 9-coordinate geometry to one Rb(2), one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Ba(5), one Ba(6), one Ba(7), and one Ba(8) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Ba(3), one Ba(4), one Ba(5), and one Ca(1) atom to form distorted OBa3Ca tetrahedra that share corners with two equivalent Sb(1)Rb2Ba4Ca pentagonal bipyramids. In the second O site, O(2) is bonded to one Ba(1), one Ba(2), one Ba(7), and one Ba(8) atom to form OBa4 tetrahedra that share  a cornercorner with one Sb(1)Rb2Ba4Ca pentagonal bipyramid and  an edgeedge with one Sb(1)Rb2Ba4Ca pentagonal bipyramid. is represented by the CIF file [CIF]
data_Rb2Ba8Ca(Sb3O)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.320
_cell_length_b   9.966
_cell_length_c   10.508
_cell_angle_alpha   116.985
_cell_angle_beta   115.803
_cell_angle_gamma   93.500
_symmetry_Int_Tables_number   1
_cell_volume   741.339
_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
  Rb  Rb0  1  0.044  0.036  0.059  1.0
  Rb  Rb1  1  0.494  0.492  0.002  1.0
  Ba  Ba2  1  0.495  0.690  0.690  1.0
  Ba  Ba3  1  0.197  0.982  0.679  1.0
  Ba  Ba4  1  0.796  0.023  0.339  1.0
  Ba  Ba5  1  0.068  0.491  0.673  1.0
  Ba  Ba6  1  0.512  0.317  0.301  1.0
  Ba  Ba7  1  0.683  0.056  0.698  1.0
  Ba  Ba8  1  0.968  0.518  0.259  1.0
  Ba  Ba9  1  0.279  0.773  0.261  1.0
  Ca  Ca10  1  0.754  0.412  0.744  1.0
  Sb  Sb11  1  0.861  0.723  0.060  1.0
  Sb  Sb12  1  0.625  0.106  0.011  1.0
  Sb  Sb13  1  0.082  0.330  0.933  1.0
  Sb  Sb14  1  0.383  0.892  0.001  1.0
  Sb  Sb15  1  0.340  0.254  0.541  1.0
  Sb  Sb16  1  0.753  0.722  0.484  1.0
  O  O17  1  0.776  0.312  0.519  1.0
  O  O18  1  0.254  0.741  0.483  1.0
[/CIF]
.