The structure described by Rb2MgNd2(WO4)4 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 11-coordinate geometry to one Mg(1), two equivalent O(1), two equivalent O(3), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. Mg(1) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-47°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-47°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Nd(2), one W(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing ORbNdW2 trigonal pyramids. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), and one W(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) 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(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded to one Rb(2), one Nd(1), one W(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing ORbNdW2 tetrahedra. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), one Mg(1), one W(1), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.884
_cell_length_b   7.884
_cell_length_c   7.535
_cell_angle_alpha   63.357
_cell_angle_beta   63.357
_cell_angle_gamma   93.829
_symmetry_Int_Tables_number   1
_cell_volume   352.469
_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  0.740  0.260  0.750  1.0
  Rb  Rb1  1  0.219  0.781  0.250  1.0
  Nd  Nd2  1  0.254  0.746  0.750  1.0
  Nd  Nd3  1  0.778  0.222  0.250  1.0
  Mg  Mg4  1  0.984  0.016  0.750  1.0
  W  W5  1  0.693  0.705  0.787  1.0
  W  W6  1  0.721  0.696  0.274  1.0
  W  W7  1  0.304  0.279  0.226  1.0
  W  W8  1  0.295  0.307  0.713  1.0
  O  O9  1  0.572  0.364  0.478  1.0
  O  O10  1  0.205  0.029  0.823  1.0
  O  O11  1  0.082  0.388  0.867  1.0
  O  O12  1  0.379  0.062  0.372  1.0
  O  O13  1  0.757  0.646  0.547  1.0
  O  O14  1  0.354  0.243  0.953  1.0
  O  O15  1  0.612  0.918  0.633  1.0
  O  O16  1  0.425  0.624  0.508  1.0
  O  O17  1  0.018  0.195  0.360  1.0
  O  O18  1  0.805  0.982  0.140  1.0
  O  O19  1  0.376  0.575  0.992  1.0
  O  O20  1  0.938  0.621  0.128  1.0
  O  O21  1  0.198  0.325  0.503  1.0
  O  O22  1  0.675  0.802  0.997  1.0
  O  O23  1  0.971  0.795  0.677  1.0
  O  O24  1  0.636  0.428  0.022  1.0
[/CIF]
.
The structure described by Rb2MgNd2(WO4)4 crystallizes in the monoclinic C2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 11-coordinate geometry to one Mg(1), two equivalent O(1), two equivalent O(3), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. In the second Rb site, Rb(2) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. Mg(1) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent O(2), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(8) atom to form a mixture of corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-47°. In the second W site, W(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 36-47°. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Rb(1), one Nd(2), one W(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing ORbNdW2 trigonal pyramids. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Rb(2), one Mg(1), one Nd(1), and one W(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Rb(1), one Nd(1), one Nd(2), and one W(1) 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(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded to one Rb(2), one Nd(1), one W(1), and one W(2) atom to form a mixture of distorted corner and edge-sharing ORbNdW2 tetrahedra. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Rb(1), one Mg(1), one Nd(2), and one W(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), one Mg(1), one W(1), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2Nd2Mg(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.884
_cell_length_b   7.884
_cell_length_c   7.535
_cell_angle_alpha   63.357
_cell_angle_beta   63.357
_cell_angle_gamma   93.829
_symmetry_Int_Tables_number   1
_cell_volume   352.469
_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  0.740  0.260  0.750  1.0
  Rb  Rb1  1  0.219  0.781  0.250  1.0
  Nd  Nd2  1  0.254  0.746  0.750  1.0
  Nd  Nd3  1  0.778  0.222  0.250  1.0
  Mg  Mg4  1  0.984  0.016  0.750  1.0
  W  W5  1  0.693  0.705  0.787  1.0
  W  W6  1  0.721  0.696  0.274  1.0
  W  W7  1  0.304  0.279  0.226  1.0
  W  W8  1  0.295  0.307  0.713  1.0
  O  O9  1  0.572  0.364  0.478  1.0
  O  O10  1  0.205  0.029  0.823  1.0
  O  O11  1  0.082  0.388  0.867  1.0
  O  O12  1  0.379  0.062  0.372  1.0
  O  O13  1  0.757  0.646  0.547  1.0
  O  O14  1  0.354  0.243  0.953  1.0
  O  O15  1  0.612  0.918  0.633  1.0
  O  O16  1  0.425  0.624  0.508  1.0
  O  O17  1  0.018  0.195  0.360  1.0
  O  O18  1  0.805  0.982  0.140  1.0
  O  O19  1  0.376  0.575  0.992  1.0
  O  O20  1  0.938  0.621  0.128  1.0
  O  O21  1  0.198  0.325  0.503  1.0
  O  O22  1  0.675  0.802  0.997  1.0
  O  O23  1  0.971  0.795  0.677  1.0
  O  O24  1  0.636  0.428  0.022  1.0
[/CIF]
.