The material structure described by KMg6Si crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent Si(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Si(1) atom. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted hexagonal planar geometry to two equivalent Mg(3) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and four equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_KMg6Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.709
_cell_length_b   7.709
_cell_length_c   4.897
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   132.664
_symmetry_Int_Tables_number   1
_cell_volume   214.026
_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  0.800  0.200  0.500  1.0
  Mg  Mg1  1  0.308  0.174  0.500  1.0
  Mg  Mg2  1  0.826  0.692  0.500  1.0
  Mg  Mg3  1  0.184  0.331  0.000  1.0
  Mg  Mg4  1  0.669  0.816  0.000  1.0
  Mg  Mg5  1  0.630  0.370  0.000  1.0
  Mg  Mg6  1  0.174  0.826  0.000  1.0
  Si  Si7  1  0.409  0.591  0.500  1.0
[/CIF]
.
The material structure described by KMg6Si crystallizes in the orthorhombic Amm2 space group. K(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent Si(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Si(1) atom. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent K(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Si(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), two equivalent Mg(4), and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted hexagonal planar geometry to two equivalent Mg(3) and four equivalent Mg(1) atoms. Si(1) is bonded in a 8-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and four equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_KMg6Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.709
_cell_length_b   7.709
_cell_length_c   4.897
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   132.664
_symmetry_Int_Tables_number   1
_cell_volume   214.026
_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  0.800  0.200  0.500  1.0
  Mg  Mg1  1  0.308  0.174  0.500  1.0
  Mg  Mg2  1  0.826  0.692  0.500  1.0
  Mg  Mg3  1  0.184  0.331  0.000  1.0
  Mg  Mg4  1  0.669  0.816  0.000  1.0
  Mg  Mg5  1  0.630  0.370  0.000  1.0
  Mg  Mg6  1  0.174  0.826  0.000  1.0
  Si  Si7  1  0.409  0.591  0.500  1.0
[/CIF]
.