The material structure described by MgPm5 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Pm(3), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(2) atoms. There are five inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), two equivalent Pm(5), and four equivalent Pm(4) atoms to form PmPm12 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(1)Pm12 cuboctahedra, and faces with six equivalent Pm(5)Pm10Mg2 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), and two equivalent Pm(4) atoms to form distorted PmPm8Mg4 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Mg4 cuboctahedra, and faces with six equivalent Pm(4)Pm10Mg2 cuboctahedra. In the third Pm site, Pm(3) is bonded to two equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), and four equivalent Pm(5) atoms to form PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(1)Pm12 cuboctahedra, edges with three equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with four equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with eight equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(1)Pm12 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(3)Pm10Mg2 cuboctahedra, and faces with four equivalent Pm(5)Pm10Mg2 cuboctahedra. In the fourth Pm site, Pm(4) is bonded to two equivalent Mg(1), two equivalent Pm(2), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(1) atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(4)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with four equivalent Pm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(1)Pm12 cuboctahedra, and faces with six equivalent Pm(2)Pm8Mg4 cuboctahedra. In the fifth Pm site, Pm(5) is bonded to two equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(3) atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(4)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(4)Pm10Mg2 cuboctahedra, edges with four equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with eight equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with two equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(5)Pm10Mg2 cuboctahedra, and faces with six equivalent Pm(1)Pm12 cuboctahedra. is represented by the CIF file [CIF]
data_Pm5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.335
_cell_length_b   9.335
_cell_length_c   5.823
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   157.105
_symmetry_Int_Tables_number   1
_cell_volume   197.422
_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
  Pm  Pm0  1  0.006  0.994  0.000  1.0
  Pm  Pm1  1  0.675  0.325  0.000  1.0
  Pm  Pm2  1  0.335  0.665  0.000  1.0
  Pm  Pm3  1  0.555  0.445  0.500  1.0
  Pm  Pm4  1  0.879  0.121  0.500  1.0
  Mg  Mg5  1  0.218  0.782  0.500  1.0
[/CIF]
.
The material structure described by MgPm5 crystallizes in the orthorhombic Amm2 space group. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Pm(3), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(2) atoms. There are five inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), two equivalent Pm(5), and four equivalent Pm(4) atoms to form PmPm12 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(1)Pm12 cuboctahedra, and faces with six equivalent Pm(5)Pm10Mg2 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), and two equivalent Pm(4) atoms to form distorted PmPm8Mg4 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Mg4 cuboctahedra, and faces with six equivalent Pm(4)Pm10Mg2 cuboctahedra. In the third Pm site, Pm(3) is bonded to two equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(2), two equivalent Pm(3), and four equivalent Pm(5) atoms to form PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(3)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(1)Pm12 cuboctahedra, corners with six equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with three equivalent Pm(1)Pm12 cuboctahedra, edges with three equivalent Pm(2)Pm8Mg4 cuboctahedra, edges with four equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with eight equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(1)Pm12 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(3)Pm10Mg2 cuboctahedra, and faces with four equivalent Pm(5)Pm10Mg2 cuboctahedra. In the fourth Pm site, Pm(4) is bonded to two equivalent Mg(1), two equivalent Pm(2), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(1) atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(4)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with four equivalent Pm(1)Pm12 cuboctahedra, edges with eight equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(5)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(1)Pm12 cuboctahedra, and faces with six equivalent Pm(2)Pm8Mg4 cuboctahedra. In the fifth Pm site, Pm(5) is bonded to two equivalent Mg(1), two equivalent Pm(1), two equivalent Pm(4), two equivalent Pm(5), and four equivalent Pm(3) atoms to form distorted PmPm10Mg2 cuboctahedra that share corners with six equivalent Pm(4)Pm10Mg2 cuboctahedra, corners with six equivalent Pm(5)Pm10Mg2 cuboctahedra, edges with three equivalent Pm(4)Pm10Mg2 cuboctahedra, edges with four equivalent Pm(3)Pm10Mg2 cuboctahedra, edges with eight equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with two equivalent Pm(4)Pm10Mg2 cuboctahedra, faces with two equivalent Pm(2)Pm8Mg4 cuboctahedra, faces with four equivalent Pm(3)Pm10Mg2 cuboctahedra, faces with four equivalent Pm(5)Pm10Mg2 cuboctahedra, and faces with six equivalent Pm(1)Pm12 cuboctahedra. is represented by the CIF file [CIF]
data_Pm5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.335
_cell_length_b   9.335
_cell_length_c   5.823
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   157.105
_symmetry_Int_Tables_number   1
_cell_volume   197.422
_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
  Pm  Pm0  1  0.006  0.994  0.000  1.0
  Pm  Pm1  1  0.675  0.325  0.000  1.0
  Pm  Pm2  1  0.335  0.665  0.000  1.0
  Pm  Pm3  1  0.555  0.445  0.500  1.0
  Pm  Pm4  1  0.879  0.121  0.500  1.0
  Mg  Mg5  1  0.218  0.782  0.500  1.0
[/CIF]
.