The structure described by K4Mg(MoO4)2 crystallizes in the monoclinic Cm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded to one O(5), one O(6), and two equivalent O(2) atoms to form distorted KO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mo(1)O4 tetrahedra, and corners with three equivalent Mo(2)O4 tetrahedra. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the third K site, K(3) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(2) atoms. Mg(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form distorted MgO4 tetrahedra that share  a cornercorner with one K(1)O4 tetrahedra, corners with two equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Mo(2)O4 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(5), and two equivalent O(1) atoms to form distorted MoO4 tetrahedra that share  a cornercorner with one K(1)O4 tetrahedra and corners with two equivalent Mg(1)O4 tetrahedra. In the second Mo site, Mo(2) is bonded to one O(3), one O(6), and two equivalent O(2) atoms to form MoO4 tetrahedra that share corners with three equivalent K(1)O4 tetrahedra and  an edgeedge with one Mg(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(2), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one K(4), and one Mo(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one K(4), one Mg(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(3), one K(4), and one Mo(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one K(1), one K(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one K(1), one Mg(1), and one Mo(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Mg(MoO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.488
_cell_length_b   7.797
_cell_length_c   7.652
_cell_angle_alpha   118.340
_cell_angle_beta   90.000
_cell_angle_gamma   114.585
_symmetry_Int_Tables_number   1
_cell_volume   300.238
_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  0.461  0.923  0.231  1.0
  K  K1  1  0.478  0.957  0.795  1.0
  K  K2  1  0.177  0.354  0.779  1.0
  K  K3  1  0.900  0.801  0.261  1.0
  Mg  Mg4  1  0.704  0.408  0.318  1.0
  Mo  Mo5  1  0.188  0.377  0.264  1.0
  Mo  Mo6  1  0.817  0.633  0.757  1.0
  O  O7  1  0.414  0.306  0.126  1.0
  O  O8  1  0.089  0.701  0.906  1.0
  O  O9  1  0.612  0.701  0.906  1.0
  O  O10  1  0.891  0.306  0.126  1.0
  O  O11  1  0.862  0.723  0.559  1.0
  O  O12  1  0.109  0.218  0.392  1.0
  O  O13  1  0.340  0.680  0.394  1.0
  O  O14  1  0.665  0.330  0.536  1.0
[/CIF]
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The structure described by K4Mg(MoO4)2 crystallizes in the monoclinic Cm space group. There are four inequivalent K sites. In the first K site, K(1) is bonded to one O(5), one O(6), and two equivalent O(2) atoms to form distorted KO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra,  a cornercorner with one Mo(1)O4 tetrahedra, and corners with three equivalent Mo(2)O4 tetrahedra. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(5), two equivalent O(1), and two equivalent O(2) atoms. In the third K site, K(3) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one O(3), one O(4), and two equivalent O(2) atoms. Mg(1) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form distorted MgO4 tetrahedra that share  a cornercorner with one K(1)O4 tetrahedra, corners with two equivalent Mo(1)O4 tetrahedra, and  an edgeedge with one Mo(2)O4 tetrahedra. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(4), one O(5), and two equivalent O(1) atoms to form distorted MoO4 tetrahedra that share  a cornercorner with one K(1)O4 tetrahedra and corners with two equivalent Mg(1)O4 tetrahedra. In the second Mo site, Mo(2) is bonded to one O(3), one O(6), and two equivalent O(2) atoms to form MoO4 tetrahedra that share corners with three equivalent K(1)O4 tetrahedra and  an edgeedge with one Mg(1)O4 tetrahedra. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one K(2), one Mg(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one K(4), and one Mo(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one K(4), one Mg(1), and one Mo(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one K(3), one K(4), and one Mo(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one K(1), one K(2), and one Mo(1) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one K(1), one Mg(1), and one Mo(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Mg(MoO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.488
_cell_length_b   7.797
_cell_length_c   7.652
_cell_angle_alpha   118.340
_cell_angle_beta   90.000
_cell_angle_gamma   114.585
_symmetry_Int_Tables_number   1
_cell_volume   300.238
_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  0.461  0.923  0.231  1.0
  K  K1  1  0.478  0.957  0.795  1.0
  K  K2  1  0.177  0.354  0.779  1.0
  K  K3  1  0.900  0.801  0.261  1.0
  Mg  Mg4  1  0.704  0.408  0.318  1.0
  Mo  Mo5  1  0.188  0.377  0.264  1.0
  Mo  Mo6  1  0.817  0.633  0.757  1.0
  O  O7  1  0.414  0.306  0.126  1.0
  O  O8  1  0.089  0.701  0.906  1.0
  O  O9  1  0.612  0.701  0.906  1.0
  O  O10  1  0.891  0.306  0.126  1.0
  O  O11  1  0.862  0.723  0.559  1.0
  O  O12  1  0.109  0.218  0.392  1.0
  O  O13  1  0.340  0.680  0.394  1.0
  O  O14  1  0.665  0.330  0.536  1.0
[/CIF]
.