The crystal structure described by Sr8MgP4(O4I)4 crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(4), one O(5), one O(8), and one I(3) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(2), one O(3), one O(6), one O(7), one O(9), and one I(4) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(3), one O(6), one O(7), and one I(1) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(16), one O(4), one O(5), one O(8), and one I(2) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one O(8), one I(2), and one I(3) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(15), one O(7), one O(9), one I(1), one I(3), and one I(4) atom. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(12), one O(14), one O(4), one O(6), one O(9), one I(1), and one I(4) atom. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(3), one O(5), one I(1), one I(2), and one I(3) atom. Mg(1) is bonded in a linear geometry to one I(2) and one I(4) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(16), and one O(7) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(8), and one O(9) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(12), one O(14), one O(3), and one O(5) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(11), one O(13), one O(4), and one O(6) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(6), and one P(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one P(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(8), and one P(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(7), and one P(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(8), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(7), and one P(4) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(6), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(5), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one P(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(8), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(7), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(6), and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(5), and one P(1) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one Sr(8) atom. In the second I site, I(2) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one Mg(1) atom. In the third I site, I(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(6), and one Sr(8) atom. In the fourth I site, I(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one Mg(1) atom. is represented by the CIF card [CIF]
data_Sr8MgP4(IO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.677
_cell_length_b   9.050
_cell_length_c   9.808
_cell_angle_alpha   88.636
_cell_angle_beta   114.477
_cell_angle_gamma   90.232
_symmetry_Int_Tables_number   1
_cell_volume   700.773
_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
  Sr  Sr0  1  0.957  0.800  0.859  1.0
  Sr  Sr1  1  0.534  0.297  0.128  1.0
  Sr  Sr2  1  0.038  0.192  0.135  1.0
  Sr  Sr3  1  0.459  0.695  0.862  1.0
  Sr  Sr4  1  0.461  0.818  0.230  1.0
  Sr  Sr5  1  0.027  0.329  0.752  1.0
  Sr  Sr6  1  0.532  0.173  0.761  1.0
  Sr  Sr7  1  0.966  0.661  0.239  1.0
  Mg  Mg8  1  0.994  1.000  0.501  1.0
  P  P9  1  0.240  0.546  0.039  1.0
  P  P10  1  0.251  0.049  0.952  1.0
  P  P11  1  0.754  0.445  0.953  1.0
  P  P12  1  0.744  0.942  0.041  1.0
  I  I13  1  0.195  0.362  0.486  1.0
  I  I14  1  0.336  0.821  0.507  1.0
  I  I15  1  0.798  0.636  0.505  1.0
  I  I16  1  0.650  0.187  0.483  1.0
  O  O17  1  0.155  0.575  0.865  1.0
  O  O18  1  0.337  0.070  0.125  1.0
  O  O19  1  0.836  0.416  0.126  1.0
  O  O20  1  0.659  0.922  0.867  1.0
  O  O21  1  0.781  0.609  0.921  1.0
  O  O22  1  0.715  0.105  0.072  1.0
  O  O23  1  0.214  0.382  0.071  1.0
  O  O24  1  0.279  0.887  0.920  1.0
  O  O25  1  0.323  0.166  0.875  1.0
  O  O26  1  0.168  0.659  0.115  1.0
  O  O27  1  0.670  0.825  0.117  1.0
  O  O28  1  0.827  0.332  0.878  1.0
  O  O29  1  0.938  0.911  0.100  1.0
  O  O30  1  0.559  0.417  0.892  1.0
  O  O31  1  0.057  0.080  0.895  1.0
  O  O32  1  0.435  0.575  0.097  1.0
[/CIF]
.
The crystal structure described by Sr8MgP4(O4I)4 crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(15), one O(4), one O(5), one O(8), and one I(3) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(14), one O(16), one O(2), one O(3), one O(6), one O(7), one O(9), and one I(4) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(3), one O(6), one O(7), and one I(1) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(16), one O(4), one O(5), one O(8), and one I(2) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one O(8), one I(2), and one I(3) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(15), one O(7), one O(9), one I(1), one I(3), and one I(4) atom. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(12), one O(14), one O(4), one O(6), one O(9), one I(1), and one I(4) atom. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(3), one O(5), one I(1), one I(2), and one I(3) atom. Mg(1) is bonded in a linear geometry to one I(2) and one I(4) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(16), and one O(7) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(15), one O(2), one O(8), and one O(9) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(12), one O(14), one O(3), and one O(5) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(11), one O(13), one O(4), and one O(6) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(6), and one P(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), and one P(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(8), and one P(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(7), and one P(4) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(4), one Sr(8), and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), one Sr(7), and one P(4) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(6), and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), one Sr(5), and one P(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one P(2) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(8), and one P(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one P(4) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(8), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(7), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Sr(6), and one P(2) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(4), one Sr(5), and one P(1) atom. There are four inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(6), one Sr(7), and one Sr(8) atom. In the second I site, I(2) is bonded in a 4-coordinate geometry to one Sr(4), one Sr(5), one Sr(8), and one Mg(1) atom. In the third I site, I(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(6), and one Sr(8) atom. In the fourth I site, I(4) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Sr(7), and one Mg(1) atom. is represented by the CIF card [CIF]
data_Sr8MgP4(IO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.677
_cell_length_b   9.050
_cell_length_c   9.808
_cell_angle_alpha   88.636
_cell_angle_beta   114.477
_cell_angle_gamma   90.232
_symmetry_Int_Tables_number   1
_cell_volume   700.773
_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
  Sr  Sr0  1  0.957  0.800  0.859  1.0
  Sr  Sr1  1  0.534  0.297  0.128  1.0
  Sr  Sr2  1  0.038  0.192  0.135  1.0
  Sr  Sr3  1  0.459  0.695  0.862  1.0
  Sr  Sr4  1  0.461  0.818  0.230  1.0
  Sr  Sr5  1  0.027  0.329  0.752  1.0
  Sr  Sr6  1  0.532  0.173  0.761  1.0
  Sr  Sr7  1  0.966  0.661  0.239  1.0
  Mg  Mg8  1  0.994  1.000  0.501  1.0
  P  P9  1  0.240  0.546  0.039  1.0
  P  P10  1  0.251  0.049  0.952  1.0
  P  P11  1  0.754  0.445  0.953  1.0
  P  P12  1  0.744  0.942  0.041  1.0
  I  I13  1  0.195  0.362  0.486  1.0
  I  I14  1  0.336  0.821  0.507  1.0
  I  I15  1  0.798  0.636  0.505  1.0
  I  I16  1  0.650  0.187  0.483  1.0
  O  O17  1  0.155  0.575  0.865  1.0
  O  O18  1  0.337  0.070  0.125  1.0
  O  O19  1  0.836  0.416  0.126  1.0
  O  O20  1  0.659  0.922  0.867  1.0
  O  O21  1  0.781  0.609  0.921  1.0
  O  O22  1  0.715  0.105  0.072  1.0
  O  O23  1  0.214  0.382  0.071  1.0
  O  O24  1  0.279  0.887  0.920  1.0
  O  O25  1  0.323  0.166  0.875  1.0
  O  O26  1  0.168  0.659  0.115  1.0
  O  O27  1  0.670  0.825  0.117  1.0
  O  O28  1  0.827  0.332  0.878  1.0
  O  O29  1  0.938  0.911  0.100  1.0
  O  O30  1  0.559  0.417  0.892  1.0
  O  O31  1  0.057  0.080  0.895  1.0
  O  O32  1  0.435  0.575  0.097  1.0
[/CIF]
.