The compound described by Sr6Mg(W2O9)2 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(7), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(14), one O(17), one O(18), one O(2), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(16), one O(3), one O(4), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(15), one O(16), one O(3), one O(6), and one O(7) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(17), one O(2), one O(5), one O(6), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(15), one O(18), one O(3), one O(8), and one O(9) atom. Mg(1) is bonded to one O(13), one O(14), one O(17), one O(18), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-59°. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(12), one O(14), one O(18), one O(2), one O(3), and one O(9) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  a faceface with one W(4)O6 octahedra. In the second W site, W(2) is bonded to one O(11), one O(13), one O(16), one O(4), one O(5), and one O(6) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(3)O6 octahedra. In the third W site, W(3) is bonded to one O(1), one O(10), one O(16), one O(17), one O(5), and one O(6) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(2)O6 octahedra. In the fourth W site, W(4) is bonded to one O(12), one O(14), one O(15), one O(3), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(1)O6 octahedra. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(5), one Sr(6), and one W(3) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(5), and one W(1) atom to form distorted OSr3W tetrahedra that share corners with two equivalent O(10)Sr3W tetrahedra,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid, and  an edgeedge with one O(12)Sr3W2 trigonal bipyramid. In the third O site, O(3) is bonded to one Sr(3), one Sr(4), one Sr(6), one W(1), and one W(4) atom to form distorted OSr3W2 trigonal bipyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(7)Sr3W trigonal pyramid,  a faceface with one O(14)Sr2MgW2 square pyramid, and  a faceface with one O(12)Sr3W2 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), one W(2), and one W(3) atom. In the sixth O site, O(6) is bonded to one Sr(4), one Sr(5), one W(2), and one W(3) atom to form OSr2W2 trigonal pyramids that share  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid, and  an edgeedge with one O(10)Sr3W tetrahedra. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(3), one Sr(4), and one W(4) atom to form distorted OSr3W trigonal pyramids that share  a cornercorner with one O(2)Sr3W tetrahedra, corners with two equivalent O(10)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid, and  an edgeedge with one O(3)Sr3W2 trigonal bipyramid. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), and one W(4) atom. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(5), one Sr(6), one Mg(1), and one W(1) atom to form distorted OSr3MgW trigonal bipyramids that share  a cornercorner with one O(14)Sr2MgW2 square pyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(12)Sr3W2 trigonal bipyramid, and  an edgeedge with one O(3)Sr3W2 trigonal bipyramid. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(4), and one W(3) atom to form distorted OSr3W tetrahedra that share  a cornercorner with one O(14)Sr2MgW2 square pyramid, corners with two equivalent O(2)Sr3W tetrahedra,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid, corners with two equivalent O(7)Sr3W trigonal pyramids, and  an edgeedge with one O(6)Sr2W2 trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Sr(6), and one W(2) atom. In the twelfth O site, O(12) is bonded to one Sr(2), one Sr(5), one Sr(6), one W(1), and one W(4) atom to form distorted OSr3W2 trigonal bipyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  a faceface with one O(14)Sr2MgW2 square pyramid, and  a faceface with one O(3)Sr3W2 trigonal bipyramid. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), and one W(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(2), one Sr(3), one Mg(1), one W(1), and one W(4) atom to form distorted OSr2MgW2 square pyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(7)Sr3W trigonal pyramid,  a faceface with one O(12)Sr3W2 trigonal bipyramid, and  a faceface with one O(3)Sr3W2 trigonal bipyramid. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Sr(4), one Sr(6), and one W(4) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Sr(3), one Sr(4), one W(2), and one W(3) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(5), one Mg(1), and one W(3) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Mg(1), and one W(1) atom. is represented by the CIF card [CIF]
data_Sr6Mg(W2O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.133
_cell_length_b   6.917
_cell_length_c   7.290
_cell_angle_alpha   87.582
_cell_angle_beta   77.860
_cell_angle_gamma   79.334
_symmetry_Int_Tables_number   1
_cell_volume   442.451
_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
  Sr  Sr0  1  0.277  0.867  0.628  1.0
  Sr  Sr1  1  0.028  0.375  0.737  1.0
  Sr  Sr2  1  0.528  0.735  0.141  1.0
  Sr  Sr3  1  0.455  0.254  0.844  1.0
  Sr  Sr4  1  0.015  0.634  0.225  1.0
  Sr  Sr5  1  0.761  0.057  0.442  1.0
  Mg  Mg6  1  0.775  0.248  0.027  1.0
  W  W7  1  0.848  0.844  0.846  1.0
  W  W8  1  0.365  0.323  0.319  1.0
  W  W9  1  0.141  0.154  0.156  1.0
  W  W10  1  0.648  0.641  0.661  1.0
  O  O11  1  0.055  0.957  0.296  1.0
  O  O12  1  0.048  0.713  0.842  1.0
  O  O13  1  0.633  0.918  0.794  1.0
  O  O14  1  0.322  0.583  0.398  1.0
  O  O15  1  0.147  0.281  0.419  1.0
  O  O16  1  0.251  0.405  0.101  1.0
  O  O17  1  0.457  0.636  0.815  1.0
  O  O18  1  0.581  0.778  0.461  1.0
  O  O19  1  0.781  0.938  0.108  1.0
  O  O20  1  0.206  0.114  0.885  1.0
  O  O21  1  0.429  0.190  0.522  1.0
  O  O22  1  0.861  0.715  0.568  1.0
  O  O23  1  0.556  0.337  0.154  1.0
  O  O24  1  0.756  0.569  0.893  1.0
  O  O25  1  0.689  0.387  0.581  1.0
  O  O26  1  0.366  0.057  0.189  1.0
  O  O27  1  0.942  0.320  0.126  1.0
  O  O28  1  0.874  0.114  0.776  1.0
[/CIF]
.
The compound described by Sr6Mg(W2O9)2 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(2), one O(4), one O(7), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(10), one O(12), one O(14), one O(17), one O(18), one O(2), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(16), one O(3), one O(4), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(15), one O(16), one O(3), one O(6), and one O(7) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(17), one O(2), one O(5), one O(6), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(15), one O(18), one O(3), one O(8), and one O(9) atom. Mg(1) is bonded to one O(13), one O(14), one O(17), one O(18), and one O(9) atom to form distorted MgO5 trigonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(4)O6 octahedra, and  an edgeedge with one W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-59°. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(12), one O(14), one O(18), one O(2), one O(3), and one O(9) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid,  an edgeedge with one Mg(1)O5 trigonal bipyramid, and  a faceface with one W(4)O6 octahedra. In the second W site, W(2) is bonded to one O(11), one O(13), one O(16), one O(4), one O(5), and one O(6) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(3)O6 octahedra. In the third W site, W(3) is bonded to one O(1), one O(10), one O(16), one O(17), one O(5), and one O(6) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(2)O6 octahedra. In the fourth W site, W(4) is bonded to one O(12), one O(14), one O(15), one O(3), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one Mg(1)O5 trigonal bipyramid and  a faceface with one W(1)O6 octahedra. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(5), one Sr(6), and one W(3) atom. In the second O site, O(2) is bonded to one Sr(1), one Sr(2), one Sr(5), and one W(1) atom to form distorted OSr3W tetrahedra that share corners with two equivalent O(10)Sr3W tetrahedra,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid, and  an edgeedge with one O(12)Sr3W2 trigonal bipyramid. In the third O site, O(3) is bonded to one Sr(3), one Sr(4), one Sr(6), one W(1), and one W(4) atom to form distorted OSr3W2 trigonal bipyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(7)Sr3W trigonal pyramid,  a faceface with one O(14)Sr2MgW2 square pyramid, and  a faceface with one O(12)Sr3W2 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), one W(2), and one W(3) atom. In the sixth O site, O(6) is bonded to one Sr(4), one Sr(5), one W(2), and one W(3) atom to form OSr2W2 trigonal pyramids that share  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid, and  an edgeedge with one O(10)Sr3W tetrahedra. In the seventh O site, O(7) is bonded to one Sr(1), one Sr(3), one Sr(4), and one W(4) atom to form distorted OSr3W trigonal pyramids that share  a cornercorner with one O(2)Sr3W tetrahedra, corners with two equivalent O(10)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid, and  an edgeedge with one O(3)Sr3W2 trigonal bipyramid. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), and one W(4) atom. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(5), one Sr(6), one Mg(1), and one W(1) atom to form distorted OSr3MgW trigonal bipyramids that share  a cornercorner with one O(14)Sr2MgW2 square pyramid,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(14)Sr2MgW2 square pyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(12)Sr3W2 trigonal bipyramid, and  an edgeedge with one O(3)Sr3W2 trigonal bipyramid. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one Sr(4), and one W(3) atom to form distorted OSr3W tetrahedra that share  a cornercorner with one O(14)Sr2MgW2 square pyramid, corners with two equivalent O(2)Sr3W tetrahedra,  a cornercorner with one O(12)Sr3W2 trigonal bipyramid,  a cornercorner with one O(3)Sr3W2 trigonal bipyramid, corners with two equivalent O(7)Sr3W trigonal pyramids, and  an edgeedge with one O(6)Sr2W2 trigonal pyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Sr(6), and one W(2) atom. In the twelfth O site, O(12) is bonded to one Sr(2), one Sr(5), one Sr(6), one W(1), and one W(4) atom to form distorted OSr3W2 trigonal bipyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(2)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  a cornercorner with one O(6)Sr2W2 trigonal pyramid,  a cornercorner with one O(7)Sr3W trigonal pyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  a faceface with one O(14)Sr2MgW2 square pyramid, and  a faceface with one O(3)Sr3W2 trigonal bipyramid. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), and one W(2) atom. In the fourteenth O site, O(14) is bonded to one Sr(2), one Sr(3), one Mg(1), one W(1), and one W(4) atom to form distorted OSr2MgW2 square pyramids that share  a cornercorner with one O(10)Sr3W tetrahedra,  a cornercorner with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(2)Sr3W tetrahedra,  an edgeedge with one O(9)Sr3MgW trigonal bipyramid,  an edgeedge with one O(7)Sr3W trigonal pyramid,  a faceface with one O(12)Sr3W2 trigonal bipyramid, and  a faceface with one O(3)Sr3W2 trigonal bipyramid. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Sr(4), one Sr(6), and one W(4) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one Sr(3), one Sr(4), one W(2), and one W(3) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(5), one Mg(1), and one W(3) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Mg(1), and one W(1) atom. is represented by the CIF card [CIF]
data_Sr6Mg(W2O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.133
_cell_length_b   6.917
_cell_length_c   7.290
_cell_angle_alpha   87.582
_cell_angle_beta   77.860
_cell_angle_gamma   79.334
_symmetry_Int_Tables_number   1
_cell_volume   442.451
_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
  Sr  Sr0  1  0.277  0.867  0.628  1.0
  Sr  Sr1  1  0.028  0.375  0.737  1.0
  Sr  Sr2  1  0.528  0.735  0.141  1.0
  Sr  Sr3  1  0.455  0.254  0.844  1.0
  Sr  Sr4  1  0.015  0.634  0.225  1.0
  Sr  Sr5  1  0.761  0.057  0.442  1.0
  Mg  Mg6  1  0.775  0.248  0.027  1.0
  W  W7  1  0.848  0.844  0.846  1.0
  W  W8  1  0.365  0.323  0.319  1.0
  W  W9  1  0.141  0.154  0.156  1.0
  W  W10  1  0.648  0.641  0.661  1.0
  O  O11  1  0.055  0.957  0.296  1.0
  O  O12  1  0.048  0.713  0.842  1.0
  O  O13  1  0.633  0.918  0.794  1.0
  O  O14  1  0.322  0.583  0.398  1.0
  O  O15  1  0.147  0.281  0.419  1.0
  O  O16  1  0.251  0.405  0.101  1.0
  O  O17  1  0.457  0.636  0.815  1.0
  O  O18  1  0.581  0.778  0.461  1.0
  O  O19  1  0.781  0.938  0.108  1.0
  O  O20  1  0.206  0.114  0.885  1.0
  O  O21  1  0.429  0.190  0.522  1.0
  O  O22  1  0.861  0.715  0.568  1.0
  O  O23  1  0.556  0.337  0.154  1.0
  O  O24  1  0.756  0.569  0.893  1.0
  O  O25  1  0.689  0.387  0.581  1.0
  O  O26  1  0.366  0.057  0.189  1.0
  O  O27  1  0.942  0.320  0.126  1.0
  O  O28  1  0.874  0.114  0.776  1.0
[/CIF]
.