The crystal structure described by KMg6Al crystallizes in the orthorhombic Amm2 space group. K(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms to form a mixture of face and corner-sharing KMg10Al2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 3-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and one Al(1) atom. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and two equivalent Al(1) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Mg(3) atoms. Al(1) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(1), two equivalent Mg(3), and four equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_KMg6Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.191
_cell_length_b   6.690
_cell_length_c   6.690
_cell_angle_alpha   118.940
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.323
_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
  Al  Al0  1  0.500  0.158  0.842  1.0
  K  K1  1  0.500  0.664  0.336  1.0
  Mg  Mg2  1  0.500  0.675  0.840  1.0
  Mg  Mg3  1  0.500  0.160  0.325  1.0
  Mg  Mg4  1  0.000  0.856  0.689  1.0
  Mg  Mg5  1  0.000  0.311  0.144  1.0
  Mg  Mg6  1  0.000  0.331  0.669  1.0
  Mg  Mg7  1  0.000  0.845  0.155  1.0
[/CIF]
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The crystal structure described by KMg6Al crystallizes in the orthorhombic Amm2 space group. K(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms to form a mixture of face and corner-sharing KMg10Al2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 3-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and one Al(1) atom. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Mg(3), and two equivalent Al(1) atoms. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Al(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Mg(3) atoms. Al(1) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(1), two equivalent Mg(3), and four equivalent Mg(2) atoms. is represented by the CIF file [CIF]
data_KMg6Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.191
_cell_length_b   6.690
_cell_length_c   6.690
_cell_angle_alpha   118.940
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.323
_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
  Al  Al0  1  0.500  0.158  0.842  1.0
  K  K1  1  0.500  0.664  0.336  1.0
  Mg  Mg2  1  0.500  0.675  0.840  1.0
  Mg  Mg3  1  0.500  0.160  0.325  1.0
  Mg  Mg4  1  0.000  0.856  0.689  1.0
  Mg  Mg5  1  0.000  0.311  0.144  1.0
  Mg  Mg6  1  0.000  0.331  0.669  1.0
  Mg  Mg7  1  0.000  0.845  0.155  1.0
[/CIF]
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