The material structure described by K2Mg(ReO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), 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 second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom. Mg(1) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form MgO6 octahedra that share  an edgeedge with one Re(2)O4 tetrahedra and edges with two equivalent Re(1)O4 trigonal pyramids. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form distorted ReO4 trigonal pyramids that share edges with two equivalent Mg(1)O6 octahedra. In the second Re site, Re(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form ReO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Re(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Re(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Mg(1), and one Re(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Mg(1), and one Re(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Mg(ReO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.545
_cell_length_b   6.379
_cell_length_c   7.983
_cell_angle_alpha   113.781
_cell_angle_beta   110.258
_cell_angle_gamma   90.071
_symmetry_Int_Tables_number   1
_cell_volume   239.141
_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
  K  K0  1  0.369  0.118  0.738  1.0
  K  K1  1  0.610  0.860  0.219  1.0
  Mg  Mg2  1  0.674  0.424  0.346  1.0
  Re  Re3  1  0.119  0.368  0.236  1.0
  Re  Re4  1  0.886  0.637  0.773  1.0
  O  O5  1  0.178  0.838  0.909  1.0
  O  O6  1  0.996  0.628  0.357  1.0
  O  O7  1  0.361  0.231  0.357  1.0
  O  O8  1  0.730  0.570  0.908  1.0
  O  O9  1  0.332  0.462  0.140  1.0
  O  O10  1  0.665  0.726  0.594  1.0
  O  O11  1  0.928  0.368  0.592  1.0
  O  O12  1  0.809  0.178  0.140  1.0
[/CIF]
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The material structure described by K2Mg(ReO4)2 crystallizes in the triclinic P1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), 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 second K site, K(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(8) atom. Mg(1) is bonded to one O(2), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form MgO6 octahedra that share  an edgeedge with one Re(2)O4 tetrahedra and edges with two equivalent Re(1)O4 trigonal pyramids. There are two inequivalent Re sites. In the first Re site, Re(1) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form distorted ReO4 trigonal pyramids that share edges with two equivalent Mg(1)O6 octahedra. In the second Re site, Re(2) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form ReO4 tetrahedra that share  an edgeedge with one Mg(1)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one Re(2) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Re(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Mg(1), and one Re(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one K(1), one Mg(1), and one Re(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), one K(2), one Mg(1), and one Re(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Mg(ReO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.545
_cell_length_b   6.379
_cell_length_c   7.983
_cell_angle_alpha   113.781
_cell_angle_beta   110.258
_cell_angle_gamma   90.071
_symmetry_Int_Tables_number   1
_cell_volume   239.141
_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
  K  K0  1  0.369  0.118  0.738  1.0
  K  K1  1  0.610  0.860  0.219  1.0
  Mg  Mg2  1  0.674  0.424  0.346  1.0
  Re  Re3  1  0.119  0.368  0.236  1.0
  Re  Re4  1  0.886  0.637  0.773  1.0
  O  O5  1  0.178  0.838  0.909  1.0
  O  O6  1  0.996  0.628  0.357  1.0
  O  O7  1  0.361  0.231  0.357  1.0
  O  O8  1  0.730  0.570  0.908  1.0
  O  O9  1  0.332  0.462  0.140  1.0
  O  O10  1  0.665  0.726  0.594  1.0
  O  O11  1  0.928  0.368  0.592  1.0
  O  O12  1  0.809  0.178  0.140  1.0
[/CIF]
.