The crystal structure described by Sr6Mg(Te4O11)2 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(16), one O(17), one O(18), one O(19), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(14), one O(15), one O(16), one O(17), one O(18), one O(20), one O(5), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(15), one O(19), and one O(5) atom. In the fourth Sr site, Sr(4) is bonded in a distorted pentagonal pyramidal geometry to one O(11), one O(12), one O(16), one O(20), one O(6), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(1), one O(14), one O(2), one O(22), one O(3), and one O(4) atom. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(2), one O(21), one O(3), and one O(4) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(13), one O(16), one O(18), and one O(22) atom. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to one O(18), one O(19), one O(2), and one O(5) atom. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(1), one O(20), and one O(6) atom. In the third Te site, Te(3) is bonded in an L-shaped geometry to one O(11) and one O(7) atom. In the fourth Te site, Te(4) is bonded in a rectangular see-saw-like geometry to one O(12), one O(17), one O(21), and one O(8) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one O(14), one O(15), one O(21), and one O(6) atom. In the sixth Te site, Te(6) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(22), and one O(5) atom. In the seventh Te site, Te(7) is bonded in a 3-coordinate geometry to one O(3), one O(8), and one O(9) atom. In the eighth Te site, Te(8) is bonded in a rectangular see-saw-like geometry to one O(10), one O(19), one O(4), and one O(7) atom. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(5), one Sr(6), and one Te(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Sr(5), one Sr(6), and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(5), one Sr(6), and one Te(7) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Sr(5), one Sr(6), and one Te(8) atom. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(3), one Te(1), and one Te(6) atom to form distorted OSr2Te2 tetrahedra that share  an edgeedge with one O(18)Sr2MgTe tetrahedra and  an edgeedge with one O(15)Sr3Te tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Te(2), and one Te(5) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Sr(2), one Te(3), and one Te(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one Te(4), and one Te(7) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(7) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(8) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Sr(3), one Sr(4), one Mg(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Sr(3), one Sr(4), and one Te(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Sr(6), one Mg(1), and one Te(6) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), and one Te(5) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Sr(3), and one Te(5) atom to form distorted OSr3Te tetrahedra that share corners with two equivalent O(18)Sr2MgTe tetrahedra and  an edgeedge with one O(5)Sr2Te2 tetrahedra. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Mg(1), and one Te(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Te(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Mg(1), and one Te(1) atom to form distorted OSr2MgTe tetrahedra that share corners with two equivalent O(15)Sr3Te tetrahedra and  an edgeedge with one O(5)Sr2Te2 tetrahedra. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Te(1), and one Te(8) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(2) atom. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Sr(6), one Te(4), and one Te(5) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Sr(5), one Mg(1), and one Te(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr6Mg(Te4O11)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.643
_cell_length_b   10.023
_cell_length_c   9.474
_cell_angle_alpha   99.278
_cell_angle_beta   109.072
_cell_angle_gamma   97.483
_symmetry_Int_Tables_number   1
_cell_volume   663.850
_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  0.289  0.998  0.121  1.0
  Sr  Sr1  1  0.726  0.970  0.908  1.0
  Sr  Sr2  1  0.840  0.060  0.346  1.0
  Sr  Sr3  1  0.163  0.927  0.677  1.0
  Sr  Sr4  1  0.314  0.532  0.613  1.0
  Sr  Sr5  1  0.698  0.461  0.369  1.0
  Mg  Mg6  1  0.191  0.230  0.890  1.0
  Te  Te7  1  0.051  0.293  0.191  1.0
  Te  Te8  1  0.956  0.683  0.809  1.0
  Te  Te9  1  0.889  0.295  0.671  1.0
  Te  Te10  1  0.016  0.735  0.241  1.0
  Te  Te11  1  0.504  0.696  0.043  1.0
  Te  Te12  1  0.564  0.305  0.947  1.0
  Te  Te13  1  0.538  0.819  0.477  1.0
  Te  Te14  1  0.420  0.182  0.510  1.0
  O  O15  1  0.983  0.589  0.628  1.0
  O  O16  1  0.024  0.404  0.371  1.0
  O  O17  1  0.501  0.627  0.451  1.0
  O  O18  1  0.491  0.369  0.517  1.0
  O  O19  1  0.795  0.193  0.132  1.0
  O  O20  1  0.210  0.786  0.893  1.0
  O  O21  1  0.667  0.193  0.701  1.0
  O  O22  1  0.315  0.829  0.308  1.0
  O  O23  1  0.442  0.860  0.635  1.0
  O  O24  1  0.541  0.117  0.374  1.0
  O  O25  1  0.013  0.135  0.654  1.0
  O  O26  1  0.993  0.859  0.403  1.0
  O  O27  1  0.456  0.346  0.100  1.0
  O  O28  1  0.563  0.681  0.866  1.0
  O  O29  1  0.589  0.890  0.118  1.0
  O  O30  1  0.417  0.117  0.889  1.0
  O  O31  1  0.974  0.844  0.094  1.0
  O  O32  1  0.056  0.139  0.001  1.0
  O  O33  1  0.160  0.162  0.313  1.0
  O  O34  1  0.858  0.831  0.730  1.0
  O  O35  1  0.730  0.638  0.177  1.0
  O  O36  1  0.355  0.359  0.803  1.0
[/CIF]
.
The crystal structure described by Sr6Mg(Te4O11)2 crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(10), one O(15), one O(16), one O(17), one O(18), one O(19), one O(6), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(14), one O(15), one O(16), one O(17), one O(18), one O(20), one O(5), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(15), one O(19), and one O(5) atom. In the fourth Sr site, Sr(4) is bonded in a distorted pentagonal pyramidal geometry to one O(11), one O(12), one O(16), one O(20), one O(6), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one O(1), one O(14), one O(2), one O(22), one O(3), and one O(4) atom. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(1), one O(13), one O(2), one O(21), one O(3), and one O(4) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(13), one O(16), one O(18), and one O(22) atom. There are eight inequivalent Te sites. In the first Te site, Te(1) is bonded in a rectangular see-saw-like geometry to one O(18), one O(19), one O(2), and one O(5) atom. In the second Te site, Te(2) is bonded in a distorted T-shaped geometry to one O(1), one O(20), and one O(6) atom. In the third Te site, Te(3) is bonded in an L-shaped geometry to one O(11) and one O(7) atom. In the fourth Te site, Te(4) is bonded in a rectangular see-saw-like geometry to one O(12), one O(17), one O(21), and one O(8) atom. In the fifth Te site, Te(5) is bonded in a 4-coordinate geometry to one O(14), one O(15), one O(21), and one O(6) atom. In the sixth Te site, Te(6) is bonded in a 4-coordinate geometry to one O(13), one O(16), one O(22), and one O(5) atom. In the seventh Te site, Te(7) is bonded in a 3-coordinate geometry to one O(3), one O(8), and one O(9) atom. In the eighth Te site, Te(8) is bonded in a rectangular see-saw-like geometry to one O(10), one O(19), one O(4), and one O(7) atom. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Sr(5), one Sr(6), and one Te(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Sr(5), one Sr(6), and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Sr(5), one Sr(6), and one Te(7) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Sr(5), one Sr(6), and one Te(8) atom. In the fifth O site, O(5) is bonded to one Sr(2), one Sr(3), one Te(1), and one Te(6) atom to form distorted OSr2Te2 tetrahedra that share  an edgeedge with one O(18)Sr2MgTe tetrahedra and  an edgeedge with one O(15)Sr3Te tetrahedra. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Te(2), and one Te(5) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Sr(2), one Te(3), and one Te(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one Te(4), and one Te(7) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(7) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(8) atom. In the eleventh O site, O(11) is bonded in a rectangular see-saw-like geometry to one Sr(3), one Sr(4), one Mg(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Sr(3), one Sr(4), and one Te(4) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Sr(6), one Mg(1), and one Te(6) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), and one Te(5) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(2), one Sr(3), and one Te(5) atom to form distorted OSr3Te tetrahedra that share corners with two equivalent O(18)Sr2MgTe tetrahedra and  an edgeedge with one O(5)Sr2Te2 tetrahedra. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Mg(1), and one Te(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one Te(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Mg(1), and one Te(1) atom to form distorted OSr2MgTe tetrahedra that share corners with two equivalent O(15)Sr3Te tetrahedra and  an edgeedge with one O(5)Sr2Te2 tetrahedra. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Te(1), and one Te(8) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(2) atom. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Sr(6), one Te(4), and one Te(5) atom. In the twenty-second O site, O(22) is bonded in a 3-coordinate geometry to one Sr(5), one Mg(1), and one Te(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr6Mg(Te4O11)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.643
_cell_length_b   10.023
_cell_length_c   9.474
_cell_angle_alpha   99.278
_cell_angle_beta   109.072
_cell_angle_gamma   97.483
_symmetry_Int_Tables_number   1
_cell_volume   663.850
_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  0.289  0.998  0.121  1.0
  Sr  Sr1  1  0.726  0.970  0.908  1.0
  Sr  Sr2  1  0.840  0.060  0.346  1.0
  Sr  Sr3  1  0.163  0.927  0.677  1.0
  Sr  Sr4  1  0.314  0.532  0.613  1.0
  Sr  Sr5  1  0.698  0.461  0.369  1.0
  Mg  Mg6  1  0.191  0.230  0.890  1.0
  Te  Te7  1  0.051  0.293  0.191  1.0
  Te  Te8  1  0.956  0.683  0.809  1.0
  Te  Te9  1  0.889  0.295  0.671  1.0
  Te  Te10  1  0.016  0.735  0.241  1.0
  Te  Te11  1  0.504  0.696  0.043  1.0
  Te  Te12  1  0.564  0.305  0.947  1.0
  Te  Te13  1  0.538  0.819  0.477  1.0
  Te  Te14  1  0.420  0.182  0.510  1.0
  O  O15  1  0.983  0.589  0.628  1.0
  O  O16  1  0.024  0.404  0.371  1.0
  O  O17  1  0.501  0.627  0.451  1.0
  O  O18  1  0.491  0.369  0.517  1.0
  O  O19  1  0.795  0.193  0.132  1.0
  O  O20  1  0.210  0.786  0.893  1.0
  O  O21  1  0.667  0.193  0.701  1.0
  O  O22  1  0.315  0.829  0.308  1.0
  O  O23  1  0.442  0.860  0.635  1.0
  O  O24  1  0.541  0.117  0.374  1.0
  O  O25  1  0.013  0.135  0.654  1.0
  O  O26  1  0.993  0.859  0.403  1.0
  O  O27  1  0.456  0.346  0.100  1.0
  O  O28  1  0.563  0.681  0.866  1.0
  O  O29  1  0.589  0.890  0.118  1.0
  O  O30  1  0.417  0.117  0.889  1.0
  O  O31  1  0.974  0.844  0.094  1.0
  O  O32  1  0.056  0.139  0.001  1.0
  O  O33  1  0.160  0.162  0.313  1.0
  O  O34  1  0.858  0.831  0.730  1.0
  O  O35  1  0.730  0.638  0.177  1.0
  O  O36  1  0.355  0.359  0.803  1.0
[/CIF]
.