The compound described by MgEu6WO12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(11), one O(4), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one W(1)O6 octahedra. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(3), one O(5), one O(6), and one O(9) atom. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), and one O(8) atom. In the fifth Eu site, Eu(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the sixth Eu site, Eu(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(9) atom. W(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom to form WO6 octahedra that share  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(3), one Eu(4), and one W(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), one Eu(6), and one W(1) atom. In the third O site, O(3) is bonded to one Eu(1), one Eu(2), one Eu(3), and one Eu(4) atom to form OEu4 tetrahedra that share corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Eu(1), one Eu(2), one Eu(4), and one Eu(6) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(5)Eu3W tetrahedra,  a cornercorner with one O(3)Eu4 tetrahedra, corners with two equivalent O(10)Eu4 tetrahedra,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid,  a cornercorner with one O(7)Eu4Mg trigonal bipyramid,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra,  an edgeedge with one O(6)Eu4Mg trigonal bipyramid, and  a faceface with one O(7)Eu4Mg trigonal bipyramid. In the fifth O site, O(5) is bonded to one Eu(2), one Eu(3), one Eu(5), and one W(1) atom to form distorted OEu3W tetrahedra that share corners with two equivalent O(3)Eu4 tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the sixth O site, O(6) is bonded to one Mg(1), one Eu(1), one Eu(2), one Eu(3), and one Eu(5) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(5)Eu3W tetrahedra,  a cornercorner with one O(3)Eu4 tetrahedra,  a cornercorner with one O(9)Eu4 tetrahedra, corners with two equivalent O(10)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  an edgeedge with one O(5)Eu3W tetrahedra,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  a faceface with one O(7)Eu4Mg trigonal bipyramid. In the seventh O site, O(7) is bonded to one Mg(1), one Eu(2), one Eu(4), one Eu(5), and one Eu(6) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(10)Eu4 tetrahedra, corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(3)Eu4 tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  an edgeedge with one O(10)Eu4 tetrahedra,  a faceface with one O(4)Eu4Mg trigonal bipyramid, and  a faceface with one O(6)Eu4Mg trigonal bipyramid. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Eu(2), one Eu(4), one Eu(5), and one W(1) atom. In the ninth O site, O(9) is bonded to one Eu(1), one Eu(3), one Eu(5), and one Eu(6) atom to form OEu4 tetrahedra that share  a cornercorner with one O(10)Eu4 tetrahedra, corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(3)Eu4 tetrahedra,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the tenth O site, O(10) is bonded to one Eu(3), one Eu(4), one Eu(5), and one Eu(6) atom to form OEu4 tetrahedra that share  a cornercorner with one O(9)Eu4 tetrahedra,  a cornercorner with one O(7)Eu4Mg trigonal bipyramid, corners with two equivalent O(4)Eu4Mg trigonal bipyramids, corners with two equivalent O(6)Eu4Mg trigonal bipyramids,  an edgeedge with one O(5)Eu3W tetrahedra,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra, and  an edgeedge with one O(7)Eu4Mg trigonal bipyramid. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Mg(1), one Eu(1), one Eu(5), one Eu(6), and one W(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Eu(3), one Eu(6), and one W(1) atom. is represented by the CIF card [CIF]
data_Eu6MgWO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.747
_cell_length_b   6.882
_cell_length_c   6.760
_cell_angle_alpha   98.806
_cell_angle_beta   97.201
_cell_angle_gamma   98.090
_symmetry_Int_Tables_number   1
_cell_volume   303.610
_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
  Eu  Eu0  1  0.379  0.855  0.670  1.0
  Eu  Eu1  1  0.258  0.594  0.135  1.0
  Eu  Eu2  1  0.143  0.308  0.605  1.0
  Eu  Eu3  1  0.853  0.681  0.445  1.0
  Eu  Eu4  1  0.687  0.345  0.859  1.0
  Eu  Eu5  1  0.607  0.165  0.317  1.0
  Mg  Mg6  1  0.644  0.757  0.056  1.0
  W  W7  1  0.020  0.013  0.008  1.0
  O  O8  1  0.034  0.930  0.716  1.0
  O  O9  1  0.292  0.979  0.065  1.0
  O  O10  1  0.171  0.593  0.443  1.0
  O  O11  1  0.569  0.828  0.342  1.0
  O  O12  1  0.056  0.286  0.955  1.0
  O  O13  1  0.431  0.592  0.842  1.0
  O  O14  1  0.600  0.451  0.177  1.0
  O  O15  1  0.931  0.727  0.049  1.0
  O  O16  1  0.433  0.172  0.599  1.0
  O  O17  1  0.821  0.397  0.579  1.0
  O  O18  1  0.708  0.006  0.937  1.0
  O  O19  1  0.983  0.102  0.282  1.0
[/CIF]
.
The compound described by MgEu6WO12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(11), one O(4), one O(6), one O(7), and one O(8) atom to form distorted MgO5 trigonal bipyramids that share  an edgeedge with one W(1)O6 octahedra. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(4), one O(6), and one O(9) atom. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the third Eu site, Eu(3) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(3), one O(5), one O(6), and one O(9) atom. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(7), and one O(8) atom. In the fifth Eu site, Eu(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the sixth Eu site, Eu(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(4), one O(7), and one O(9) atom. W(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(8) atom to form WO6 octahedra that share  an edgeedge with one Mg(1)O5 trigonal bipyramid. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(3), one Eu(4), and one W(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Eu(1), one Eu(2), one Eu(6), and one W(1) atom. In the third O site, O(3) is bonded to one Eu(1), one Eu(2), one Eu(3), and one Eu(4) atom to form OEu4 tetrahedra that share corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the fourth O site, O(4) is bonded to one Mg(1), one Eu(1), one Eu(2), one Eu(4), and one Eu(6) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(5)Eu3W tetrahedra,  a cornercorner with one O(3)Eu4 tetrahedra, corners with two equivalent O(10)Eu4 tetrahedra,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid,  a cornercorner with one O(7)Eu4Mg trigonal bipyramid,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra,  an edgeedge with one O(6)Eu4Mg trigonal bipyramid, and  a faceface with one O(7)Eu4Mg trigonal bipyramid. In the fifth O site, O(5) is bonded to one Eu(2), one Eu(3), one Eu(5), and one W(1) atom to form distorted OEu3W tetrahedra that share corners with two equivalent O(3)Eu4 tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the sixth O site, O(6) is bonded to one Mg(1), one Eu(1), one Eu(2), one Eu(3), and one Eu(5) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(5)Eu3W tetrahedra,  a cornercorner with one O(3)Eu4 tetrahedra,  a cornercorner with one O(9)Eu4 tetrahedra, corners with two equivalent O(10)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  an edgeedge with one O(5)Eu3W tetrahedra,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  a faceface with one O(7)Eu4Mg trigonal bipyramid. In the seventh O site, O(7) is bonded to one Mg(1), one Eu(2), one Eu(4), one Eu(5), and one Eu(6) atom to form distorted OEu4Mg trigonal bipyramids that share  a cornercorner with one O(10)Eu4 tetrahedra, corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(3)Eu4 tetrahedra, corners with two equivalent O(9)Eu4 tetrahedra,  a cornercorner with one O(4)Eu4Mg trigonal bipyramid,  an edgeedge with one O(10)Eu4 tetrahedra,  a faceface with one O(4)Eu4Mg trigonal bipyramid, and  a faceface with one O(6)Eu4Mg trigonal bipyramid. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Mg(1), one Eu(2), one Eu(4), one Eu(5), and one W(1) atom. In the ninth O site, O(9) is bonded to one Eu(1), one Eu(3), one Eu(5), and one Eu(6) atom to form OEu4 tetrahedra that share  a cornercorner with one O(10)Eu4 tetrahedra, corners with two equivalent O(5)Eu3W tetrahedra, corners with two equivalent O(3)Eu4 tetrahedra,  a cornercorner with one O(6)Eu4Mg trigonal bipyramid, corners with two equivalent O(7)Eu4Mg trigonal bipyramids,  an edgeedge with one O(10)Eu4 tetrahedra,  an edgeedge with one O(4)Eu4Mg trigonal bipyramid, and  an edgeedge with one O(6)Eu4Mg trigonal bipyramid. In the tenth O site, O(10) is bonded to one Eu(3), one Eu(4), one Eu(5), and one Eu(6) atom to form OEu4 tetrahedra that share  a cornercorner with one O(9)Eu4 tetrahedra,  a cornercorner with one O(7)Eu4Mg trigonal bipyramid, corners with two equivalent O(4)Eu4Mg trigonal bipyramids, corners with two equivalent O(6)Eu4Mg trigonal bipyramids,  an edgeedge with one O(5)Eu3W tetrahedra,  an edgeedge with one O(3)Eu4 tetrahedra,  an edgeedge with one O(9)Eu4 tetrahedra, and  an edgeedge with one O(7)Eu4Mg trigonal bipyramid. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Mg(1), one Eu(1), one Eu(5), one Eu(6), and one W(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Eu(3), one Eu(6), and one W(1) atom. is represented by the CIF card [CIF]
data_Eu6MgWO12
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.747
_cell_length_b   6.882
_cell_length_c   6.760
_cell_angle_alpha   98.806
_cell_angle_beta   97.201
_cell_angle_gamma   98.090
_symmetry_Int_Tables_number   1
_cell_volume   303.610
_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
  Eu  Eu0  1  0.379  0.855  0.670  1.0
  Eu  Eu1  1  0.258  0.594  0.135  1.0
  Eu  Eu2  1  0.143  0.308  0.605  1.0
  Eu  Eu3  1  0.853  0.681  0.445  1.0
  Eu  Eu4  1  0.687  0.345  0.859  1.0
  Eu  Eu5  1  0.607  0.165  0.317  1.0
  Mg  Mg6  1  0.644  0.757  0.056  1.0
  W  W7  1  0.020  0.013  0.008  1.0
  O  O8  1  0.034  0.930  0.716  1.0
  O  O9  1  0.292  0.979  0.065  1.0
  O  O10  1  0.171  0.593  0.443  1.0
  O  O11  1  0.569  0.828  0.342  1.0
  O  O12  1  0.056  0.286  0.955  1.0
  O  O13  1  0.431  0.592  0.842  1.0
  O  O14  1  0.600  0.451  0.177  1.0
  O  O15  1  0.931  0.727  0.049  1.0
  O  O16  1  0.433  0.172  0.599  1.0
  O  O17  1  0.821  0.397  0.579  1.0
  O  O18  1  0.708  0.006  0.937  1.0
  O  O19  1  0.983  0.102  0.282  1.0
[/CIF]
.