The crystal structure described by NaMg6Si crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Si(1) atoms to form NaMg10Si2 cuboctahedra that share corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with six equivalent Na(1)Mg10Si2 cuboctahedra; corners with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Mg(3)Mg10Si2 cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the second Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the third Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(1,1)Na2Mg8Si2 cuboctahedra. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four Mg(1,1); four Mg(2,2); and two equivalent Si(1) atoms to form distorted MgMg10Si2 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with six equivalent Mg(3)Mg10Si2 cuboctahedra; corners with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; edges with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Na(1)Mg10Si2 cuboctahedra. In the fifth Mg site, Mg(4) is bonded to two equivalent Na(1); two equivalent Mg(3); four Mg(1,1); and four Mg(2,2) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with six equivalent Mg(4)Na2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Si(1)Na2Mg10 cuboctahedra. In the sixth Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the seventh Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra. Si(1) is bonded to two equivalent Na(1); two equivalent Mg(3); four Mg(1,1,1); and four equivalent Mg(2) atoms to form SiNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with six equivalent Si(1)Na2Mg10 cuboctahedra; corners with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_NaMg6Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.019
_cell_length_b   6.339
_cell_length_c   6.398
_cell_angle_alpha   119.694
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.815
_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
  Mg  Mg0  1  0.500  0.668  0.833  1.0
  Mg  Mg1  1  0.500  0.165  0.833  1.0
  Mg  Mg2  1  0.000  0.840  0.169  1.0
  Mg  Mg3  1  0.000  0.329  0.169  1.0
  Mg  Mg4  1  0.000  0.332  0.663  1.0
  Mg  Mg5  1  0.000  0.835  0.670  1.0
  Na  Na6  1  0.500  0.667  0.334  1.0
  Si  Si7  1  0.500  0.165  0.329  1.0
[/CIF]
.
The crystal structure described by NaMg6Si crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4); four Mg(1,1,1); four equivalent Mg(2); and two equivalent Si(1) atoms to form NaMg10Si2 cuboctahedra that share corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with six equivalent Na(1)Mg10Si2 cuboctahedra; corners with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Mg(3)Mg10Si2 cuboctahedra. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the second Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the third Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(1,1)Na2Mg8Si2 cuboctahedra. In the fourth Mg site, Mg(3) is bonded to two equivalent Mg(4); four Mg(1,1); four Mg(2,2); and two equivalent Si(1) atoms to form distorted MgMg10Si2 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with six equivalent Mg(3)Mg10Si2 cuboctahedra; corners with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; edges with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Na(1)Mg10Si2 cuboctahedra. In the fifth Mg site, Mg(4) is bonded to two equivalent Na(1); two equivalent Mg(3); four Mg(1,1); and four Mg(2,2) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with six equivalent Mg(4)Na2Mg10 cuboctahedra; corners with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Si(1)Na2Mg10 cuboctahedra. In the sixth Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with four equivalent Si(1)Na2Mg10 cuboctahedra; corners with ten Mg(1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with two equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Si(1)Na2Mg10 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four equivalent Mg(4)Na2Mg10 cuboctahedra; edges with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(2,2)Na2Mg8Si2 cuboctahedra. In the seventh Mg site, Mg(2) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Si(1) atoms to form distorted MgNa2Mg8Si2 cuboctahedra that share corners with four equivalent Mg(3)Mg10Si2 cuboctahedra; corners with four equivalent Mg(4)Na2Mg10 cuboctahedra; corners with ten Mg(2,2)Na2Mg8Si2 cuboctahedra; edges with two equivalent Mg(3)Mg10Si2 cuboctahedra; edges with two equivalent Mg(4)Na2Mg10 cuboctahedra; edges with two equivalent Mg(2)Na2Mg8Si2 cuboctahedra; edges with four equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(1)Na2Mg8Si2 cuboctahedra; edges with four equivalent Si(1)Na2Mg10 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Mg(4)Na2Mg10 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(2,2)Na2Mg8Si2 cuboctahedra; and faces with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra. Si(1) is bonded to two equivalent Na(1); two equivalent Mg(3); four Mg(1,1,1); and four equivalent Mg(2) atoms to form SiNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg10Si2 cuboctahedra; corners with six equivalent Si(1)Na2Mg10 cuboctahedra; corners with eight Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with two equivalent Na(1)Mg10Si2 cuboctahedra; edges with four equivalent Mg(3)Mg10Si2 cuboctahedra; edges with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; edges with eight Mg(2,2)Na2Mg8Si2 cuboctahedra; faces with two equivalent Na(1)Mg10Si2 cuboctahedra; faces with two equivalent Mg(3)Mg10Si2 cuboctahedra; faces with two equivalent Si(1)Na2Mg10 cuboctahedra; faces with four Mg(1,1,1)Na2Mg8Si2 cuboctahedra; faces with four equivalent Mg(2)Na2Mg8Si2 cuboctahedra; and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_NaMg6Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.019
_cell_length_b   6.339
_cell_length_c   6.398
_cell_angle_alpha   119.694
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.815
_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
  Mg  Mg0  1  0.500  0.668  0.833  1.0
  Mg  Mg1  1  0.500  0.165  0.833  1.0
  Mg  Mg2  1  0.000  0.840  0.169  1.0
  Mg  Mg3  1  0.000  0.329  0.169  1.0
  Mg  Mg4  1  0.000  0.332  0.663  1.0
  Mg  Mg5  1  0.000  0.835  0.670  1.0
  Na  Na6  1  0.500  0.667  0.334  1.0
  Si  Si7  1  0.500  0.165  0.329  1.0
[/CIF]
.