The material structure described by Rb2CaNd2(WO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(7), and one O(9) atom. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(15), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. Ca(1) is bonded in a 6-coordinate geometry to one O(11), one O(15), one O(16), one O(3), one O(8), and one O(9) atom. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(11), one O(12), one O(15), one O(2), one O(4), and one O(7) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent W(3)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-41°. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to one O(10), one O(16), one O(3), one O(4), one O(7), and one O(9) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(11), one O(14), one O(15), one O(16), one O(5), and one O(7) atom to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid,  an edgeedge with one W(3)O6 octahedra, and  an edgeedge with one Nd(1)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 26-28°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid, and  an edgeedge with one W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. In the third W site, W(3) is bonded to one O(11), one O(13), one O(16), one O(4), one O(6), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(4)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. In the fourth W site, W(4) is bonded to one O(1), one O(13), one O(2), one O(3), one O(6), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one W(2), and one W(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(4) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Rb(1), one Ca(1), one Nd(2), and one W(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one Nd(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one W(3), and one W(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(2), one Ca(1), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Rb(1), one Ca(1), one Nd(2), and one W(3) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Rb(1), one Rb(2), one Nd(2), and one W(2) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Nd(1), one W(1), and one W(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Rb(1), one W(3), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Rb(2), one Ca(1), one Nd(1), and one W(1) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Nd(2), one W(1), and one W(3) atom. is represented by the CIF card [CIF]
data_Rb2CaNd2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.781
_cell_length_b   10.010
_cell_length_c   7.763
_cell_angle_alpha   54.682
_cell_angle_beta   72.588
_cell_angle_gamma   93.252
_symmetry_Int_Tables_number   1
_cell_volume   392.026
_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  0.804  0.151  0.701  1.0
  Rb  Rb1  1  0.213  0.878  0.284  1.0
  Ca  Ca2  1  0.087  0.501  0.853  1.0
  Nd  Nd3  1  0.257  0.861  0.805  1.0
  Nd  Nd4  1  0.732  0.117  0.231  1.0
  W  W5  1  0.681  0.682  0.827  1.0
  W  W6  1  0.682  0.682  0.325  1.0
  W  W7  1  0.320  0.312  0.195  1.0
  W  W8  1  0.330  0.309  0.688  1.0
  O  O9  1  0.631  0.417  0.496  1.0
  O  O10  1  0.335  0.083  0.814  1.0
  O  O11  1  0.026  0.273  0.859  1.0
  O  O12  1  0.364  0.086  0.400  1.0
  O  O13  1  0.743  0.667  0.581  1.0
  O  O14  1  0.378  0.284  0.944  1.0
  O  O15  1  0.641  0.905  0.632  1.0
  O  O16  1  0.360  0.572  0.533  1.0
  O  O17  1  0.027  0.263  0.243  1.0
  O  O18  1  0.658  0.912  0.206  1.0
  O  O19  1  0.355  0.583  0.942  1.0
  O  O20  1  0.977  0.735  0.157  1.0
  O  O21  1  0.264  0.334  0.447  1.0
  O  O22  1  0.619  0.702  0.066  1.0
  O  O23  1  0.984  0.741  0.755  1.0
  O  O24  1  0.649  0.424  0.050  1.0
[/CIF]
.
The material structure described by Rb2CaNd2(WO4)4 crystallizes in the triclinic P1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(3), one O(7), and one O(9) atom. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(15), one O(2), one O(4), one O(5), one O(6), and one O(8) atom. Ca(1) is bonded in a 6-coordinate geometry to one O(11), one O(15), one O(16), one O(3), one O(8), and one O(9) atom. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to one O(11), one O(12), one O(15), one O(2), one O(4), and one O(7) atom to form distorted NdO6 pentagonal pyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, corners with two equivalent W(3)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-41°. In the second Nd site, Nd(2) is bonded in a 6-coordinate geometry to one O(10), one O(16), one O(3), one O(4), one O(7), and one O(9) atom. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(11), one O(14), one O(15), one O(16), one O(5), and one O(7) atom to form WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid,  an edgeedge with one W(3)O6 octahedra, and  an edgeedge with one Nd(1)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 26-28°. In the second W site, W(2) is bonded to one O(1), one O(10), one O(12), one O(14), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid, and  an edgeedge with one W(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. In the third W site, W(3) is bonded to one O(11), one O(13), one O(16), one O(4), one O(6), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(4)O6 octahedra, corners with two equivalent Nd(1)O6 pentagonal pyramids, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. In the fourth W site, W(4) is bonded to one O(1), one O(13), one O(2), one O(3), one O(6), and one O(8) atom to form WO6 octahedra that share corners with two equivalent W(3)O6 octahedra,  a cornercorner with one Nd(1)O6 pentagonal pyramid, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-28°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one W(2), and one W(4) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Nd(1), and one W(4) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Rb(1), one Ca(1), one Nd(2), and one W(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(2), one Nd(1), one Nd(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Rb(2), one W(3), and one W(4) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Rb(2), one Ca(1), one W(2), and one W(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Rb(1), one Ca(1), one Nd(2), and one W(3) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Rb(1), one Rb(2), one Nd(2), and one W(2) atom. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Nd(1), one W(1), and one W(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Rb(2), one Nd(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Rb(1), one W(3), and one W(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one W(1) and one W(2) atom. In the fifteenth O site, O(15) is bonded in a distorted rectangular see-saw-like geometry to one Rb(2), one Ca(1), one Nd(1), and one W(1) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), one Nd(2), one W(1), and one W(3) atom. is represented by the CIF card [CIF]
data_Rb2CaNd2(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.781
_cell_length_b   10.010
_cell_length_c   7.763
_cell_angle_alpha   54.682
_cell_angle_beta   72.588
_cell_angle_gamma   93.252
_symmetry_Int_Tables_number   1
_cell_volume   392.026
_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  0.804  0.151  0.701  1.0
  Rb  Rb1  1  0.213  0.878  0.284  1.0
  Ca  Ca2  1  0.087  0.501  0.853  1.0
  Nd  Nd3  1  0.257  0.861  0.805  1.0
  Nd  Nd4  1  0.732  0.117  0.231  1.0
  W  W5  1  0.681  0.682  0.827  1.0
  W  W6  1  0.682  0.682  0.325  1.0
  W  W7  1  0.320  0.312  0.195  1.0
  W  W8  1  0.330  0.309  0.688  1.0
  O  O9  1  0.631  0.417  0.496  1.0
  O  O10  1  0.335  0.083  0.814  1.0
  O  O11  1  0.026  0.273  0.859  1.0
  O  O12  1  0.364  0.086  0.400  1.0
  O  O13  1  0.743  0.667  0.581  1.0
  O  O14  1  0.378  0.284  0.944  1.0
  O  O15  1  0.641  0.905  0.632  1.0
  O  O16  1  0.360  0.572  0.533  1.0
  O  O17  1  0.027  0.263  0.243  1.0
  O  O18  1  0.658  0.912  0.206  1.0
  O  O19  1  0.355  0.583  0.942  1.0
  O  O20  1  0.977  0.735  0.157  1.0
  O  O21  1  0.264  0.334  0.447  1.0
  O  O22  1  0.619  0.702  0.066  1.0
  O  O23  1  0.984  0.741  0.755  1.0
  O  O24  1  0.649  0.424  0.050  1.0
[/CIF]
.