The crystal structure described by MgPr2Si4 crystallizes in the tetragonal I4_1md space group. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), one Si(1), and one Si(3) atom. In the second Si site, Si(4) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), one Si(2), and one Si(4) atom. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(2), one Si(4), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Pr2MgSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.108
_cell_length_b   6.108
_cell_length_c   17.563
_cell_angle_alpha   100.014
_cell_angle_beta   100.014
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   635.219
_cell_formula_units_Z   4
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
  Pr  Pr0  1  0.801  0.052  0.601  1.0
  Pr  Pr1  1  0.801  0.549  0.601  1.0
  Pr  Pr2  1  0.799  0.551  0.101  1.0
  Pr  Pr3  1  0.450  0.201  0.899  1.0
  Pr  Pr4  1  0.450  0.698  0.899  1.0
  Pr  Pr5  1  0.302  0.551  0.101  1.0
  Pr  Pr6  1  0.451  0.200  0.399  1.0
  Pr  Pr7  1  0.948  0.200  0.399  1.0
  Mg  Mg8  1  0.125  0.375  0.250  1.0
  Mg  Mg9  1  0.125  0.876  0.250  1.0
  Mg  Mg10  1  0.126  0.875  0.750  1.0
  Mg  Mg11  1  0.625  0.875  0.750  1.0
  Si  Si12  1  0.264  0.501  0.529  1.0
  Si  Si13  1  0.264  0.028  0.529  1.0
  Si  Si14  1  0.278  0.014  0.029  1.0
  Si  Si15  1  0.986  0.719  0.972  1.0
  Si  Si16  1  0.986  0.252  0.972  1.0
  Si  Si17  1  0.751  0.014  0.029  1.0
  Si  Si18  1  0.969  0.736  0.472  1.0
  Si  Si19  1  0.502  0.736  0.472  1.0
  Si  Si20  1  0.334  0.528  0.668  1.0
  Si  Si21  1  0.334  0.140  0.668  1.0
  Si  Si22  1  0.390  0.084  0.168  1.0
  Si  Si23  1  0.916  0.610  0.832  1.0
  Si  Si24  1  0.916  0.222  0.832  1.0
  Si  Si25  1  0.778  0.084  0.168  1.0
  Si  Si26  1  0.860  0.666  0.332  1.0
  Si  Si27  1  0.472  0.666  0.332  1.0
[/CIF]
.
The crystal structure described by MgPr2Si4 crystallizes in the tetragonal I4_1md space group. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), one Si(1), and one Si(3) atom. In the second Si site, Si(4) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), one Si(2), and one Si(4) atom. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(2), one Si(4), and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Pr2MgSi4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.108
_cell_length_b   6.108
_cell_length_c   17.563
_cell_angle_alpha   100.014
_cell_angle_beta   100.014
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   635.219
_cell_formula_units_Z   4
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
  Pr  Pr0  1  0.801  0.052  0.601  1.0
  Pr  Pr1  1  0.801  0.549  0.601  1.0
  Pr  Pr2  1  0.799  0.551  0.101  1.0
  Pr  Pr3  1  0.450  0.201  0.899  1.0
  Pr  Pr4  1  0.450  0.698  0.899  1.0
  Pr  Pr5  1  0.302  0.551  0.101  1.0
  Pr  Pr6  1  0.451  0.200  0.399  1.0
  Pr  Pr7  1  0.948  0.200  0.399  1.0
  Mg  Mg8  1  0.125  0.375  0.250  1.0
  Mg  Mg9  1  0.125  0.876  0.250  1.0
  Mg  Mg10  1  0.126  0.875  0.750  1.0
  Mg  Mg11  1  0.625  0.875  0.750  1.0
  Si  Si12  1  0.264  0.501  0.529  1.0
  Si  Si13  1  0.264  0.028  0.529  1.0
  Si  Si14  1  0.278  0.014  0.029  1.0
  Si  Si15  1  0.986  0.719  0.972  1.0
  Si  Si16  1  0.986  0.252  0.972  1.0
  Si  Si17  1  0.751  0.014  0.029  1.0
  Si  Si18  1  0.969  0.736  0.472  1.0
  Si  Si19  1  0.502  0.736  0.472  1.0
  Si  Si20  1  0.334  0.528  0.668  1.0
  Si  Si21  1  0.334  0.140  0.668  1.0
  Si  Si22  1  0.390  0.084  0.168  1.0
  Si  Si23  1  0.916  0.610  0.832  1.0
  Si  Si24  1  0.916  0.222  0.832  1.0
  Si  Si25  1  0.778  0.084  0.168  1.0
  Si  Si26  1  0.860  0.666  0.332  1.0
  Si  Si27  1  0.472  0.666  0.332  1.0
[/CIF]
.