The material 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(13), one O(15), 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 7-coordinate geometry to one O(14), one O(16), one O(17), one O(18), one O(20), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(13), one O(15), one O(17), one O(19), one O(2), and one O(5) atom. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(16), one O(18), one O(6), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(2), one O(22), one O(3), one O(4), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(20), one O(21), one O(3), and one O(4) atom. Mg(1) is bonded in a distorted trigonal bipyramidal geometry to one O(10), one O(11), one O(12), one O(20), and one O(7) 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(19), one O(2), one O(3), and one O(5) atom. In the second Te site, Te(2) is bonded in an L-shaped geometry to one O(1) and one O(6) atom. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(18), one O(22), 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 distorted see-saw-like 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 rectangular see-saw-like 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 rectangular see-saw-like geometry to one O(20), one O(3), one O(8), and one O(9) atom. In the eighth Te site, Te(8) is bonded in a distorted trigonal non-coplanar geometry to one O(10), 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 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 4-coordinate geometry to one Sr(3), one Sr(5), one Sr(6), and one Te(1) atom. In the third O site, O(3) is bonded to one Sr(5), one Sr(6), one Te(1), and one Te(7) atom to form distorted corner-sharing OSr2Te2 tetrahedra. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Sr(5), one Sr(6), and one Te(8) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Sr(3), one Te(1), and one Te(6) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(4), one Te(2), and one Te(5) atom to form a mixture of distorted corner and edge-sharing OSr2Te2 tetrahedra. In the seventh O site, O(7) is bonded to one Sr(2), one Mg(1), one Te(3), and one Te(8) atom to form distorted edge-sharing OSrMgTe2 trigonal pyramids. In the eighth O site, O(8) is bonded in a 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 4-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), and one Te(7) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), one Mg(1), and one Te(8) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Sr(4), one Mg(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), and one Te(4) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), one Sr(3), one Sr(6), and one Te(6) atom to form distorted OSr3Te trigonal pyramids that share  a cornercorner with one O(3)Sr2Te2 tetrahedra,  a cornercorner with one O(6)Sr2Te2 tetrahedra, and  a cornercorner with one O(18)Sr3Te tetrahedra. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Sr(2), one Sr(5), and one Te(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(5) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(6) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one Te(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Sr(4), and one Te(3) atom to form distorted OSr3Te tetrahedra that share  a cornercorner with one O(13)Sr3Te trigonal pyramid,  an edgeedge with one O(6)Sr2Te2 tetrahedra, and  an edgeedge with one O(7)SrMgTe2 trigonal pyramid. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(1) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Mg(1), and one Te(7) atom. In the twenty-first O site, O(21) is bonded in a distorted 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 Te(3), 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   7.951
_cell_length_b   9.300
_cell_length_c   9.778
_cell_angle_alpha   99.606
_cell_angle_beta   109.636
_cell_angle_gamma   100.117
_symmetry_Int_Tables_number   1
_cell_volume   650.140
_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  0.286  0.036  0.131  1.0
  Sr  Sr1  1  0.708  0.915  0.844  1.0
  Sr  Sr2  1  0.828  0.114  0.253  1.0
  Sr  Sr3  1  0.188  0.927  0.702  1.0
  Sr  Sr4  1  0.297  0.505  0.631  1.0
  Sr  Sr5  1  0.711  0.484  0.415  1.0
  Mg  Mg6  1  0.807  0.005  0.528  1.0
  Te  Te7  1  0.096  0.397  0.213  1.0
  Te  Te8  1  0.961  0.635  0.838  1.0
  Te  Te9  1  0.060  0.262  0.815  1.0
  Te  Te10  1  0.962  0.779  0.242  1.0
  Te  Te11  1  0.452  0.702  0.047  1.0
  Te  Te12  1  0.584  0.305  0.978  1.0
  Te  Te13  1  0.457  0.766  0.433  1.0
  Te  Te14  1  0.519  0.169  0.563  1.0
  O  O15  1  0.997  0.538  0.660  1.0
  O  O16  1  0.998  0.434  0.364  1.0
  O  O17  1  0.392  0.549  0.398  1.0
  O  O18  1  0.579  0.380  0.610  1.0
  O  O19  1  0.855  0.257  0.063  1.0
  O  O20  1  0.189  0.796  0.908  1.0
  O  O21  1  0.729  0.120  0.696  1.0
  O  O22  1  0.228  0.871  0.308  1.0
  O  O23  1  0.375  0.791  0.596  1.0
  O  O24  1  0.619  0.125  0.411  1.0
  O  O25  1  0.047  0.164  0.623  1.0
  O  O26  1  0.941  0.915  0.403  1.0
  O  O27  1  0.553  0.274  0.156  1.0
  O  O28  1  0.512  0.683  0.874  1.0
  O  O29  1  0.546  0.913  0.125  1.0
  O  O30  1  0.488  0.102  0.863  1.0
  O  O31  1  0.913  0.899  0.101  1.0
  O  O32  1  0.077  0.085  0.888  1.0
  O  O33  1  0.181  0.233  0.273  1.0
  O  O34  1  0.717  0.807  0.572  1.0
  O  O35  1  0.665  0.648  0.182  1.0
  O  O36  1  0.322  0.359  0.876  1.0
[/CIF]
.
The material 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(13), one O(15), 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 7-coordinate geometry to one O(14), one O(16), one O(17), one O(18), one O(20), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(10), one O(12), one O(13), one O(15), one O(17), one O(19), one O(2), and one O(5) atom. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(16), one O(18), one O(6), and one O(9) atom. In the fifth Sr site, Sr(5) is bonded in a 7-coordinate geometry to one O(1), one O(14), one O(2), one O(22), one O(3), one O(4), and one O(9) atom. In the sixth Sr site, Sr(6) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(2), one O(20), one O(21), one O(3), and one O(4) atom. Mg(1) is bonded in a distorted trigonal bipyramidal geometry to one O(10), one O(11), one O(12), one O(20), and one O(7) 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(19), one O(2), one O(3), and one O(5) atom. In the second Te site, Te(2) is bonded in an L-shaped geometry to one O(1) and one O(6) atom. In the third Te site, Te(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(18), one O(22), 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 distorted see-saw-like 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 rectangular see-saw-like 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 rectangular see-saw-like geometry to one O(20), one O(3), one O(8), and one O(9) atom. In the eighth Te site, Te(8) is bonded in a distorted trigonal non-coplanar geometry to one O(10), 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 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 4-coordinate geometry to one Sr(3), one Sr(5), one Sr(6), and one Te(1) atom. In the third O site, O(3) is bonded to one Sr(5), one Sr(6), one Te(1), and one Te(7) atom to form distorted corner-sharing OSr2Te2 tetrahedra. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Sr(5), one Sr(6), and one Te(8) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Sr(3), one Te(1), and one Te(6) atom. In the sixth O site, O(6) is bonded to one Sr(1), one Sr(4), one Te(2), and one Te(5) atom to form a mixture of distorted corner and edge-sharing OSr2Te2 tetrahedra. In the seventh O site, O(7) is bonded to one Sr(2), one Mg(1), one Te(3), and one Te(8) atom to form distorted edge-sharing OSrMgTe2 trigonal pyramids. In the eighth O site, O(8) is bonded in a 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 4-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), and one Te(7) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), one Mg(1), and one Te(8) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Sr(4), one Mg(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), and one Te(4) atom. In the thirteenth O site, O(13) is bonded to one Sr(1), one Sr(3), one Sr(6), and one Te(6) atom to form distorted OSr3Te trigonal pyramids that share  a cornercorner with one O(3)Sr2Te2 tetrahedra,  a cornercorner with one O(6)Sr2Te2 tetrahedra, and  a cornercorner with one O(18)Sr3Te tetrahedra. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Sr(2), one Sr(5), and one Te(5) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(5) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), and one Te(6) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one Te(4) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(2), one Sr(4), and one Te(3) atom to form distorted OSr3Te tetrahedra that share  a cornercorner with one O(13)Sr3Te trigonal pyramid,  an edgeedge with one O(6)Sr2Te2 tetrahedra, and  an edgeedge with one O(7)SrMgTe2 trigonal pyramid. In the nineteenth O site, O(19) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one Te(1) atom. In the twentieth O site, O(20) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(6), one Mg(1), and one Te(7) atom. In the twenty-first O site, O(21) is bonded in a distorted 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 Te(3), 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   7.951
_cell_length_b   9.300
_cell_length_c   9.778
_cell_angle_alpha   99.606
_cell_angle_beta   109.636
_cell_angle_gamma   100.117
_symmetry_Int_Tables_number   1
_cell_volume   650.140
_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  0.286  0.036  0.131  1.0
  Sr  Sr1  1  0.708  0.915  0.844  1.0
  Sr  Sr2  1  0.828  0.114  0.253  1.0
  Sr  Sr3  1  0.188  0.927  0.702  1.0
  Sr  Sr4  1  0.297  0.505  0.631  1.0
  Sr  Sr5  1  0.711  0.484  0.415  1.0
  Mg  Mg6  1  0.807  0.005  0.528  1.0
  Te  Te7  1  0.096  0.397  0.213  1.0
  Te  Te8  1  0.961  0.635  0.838  1.0
  Te  Te9  1  0.060  0.262  0.815  1.0
  Te  Te10  1  0.962  0.779  0.242  1.0
  Te  Te11  1  0.452  0.702  0.047  1.0
  Te  Te12  1  0.584  0.305  0.978  1.0
  Te  Te13  1  0.457  0.766  0.433  1.0
  Te  Te14  1  0.519  0.169  0.563  1.0
  O  O15  1  0.997  0.538  0.660  1.0
  O  O16  1  0.998  0.434  0.364  1.0
  O  O17  1  0.392  0.549  0.398  1.0
  O  O18  1  0.579  0.380  0.610  1.0
  O  O19  1  0.855  0.257  0.063  1.0
  O  O20  1  0.189  0.796  0.908  1.0
  O  O21  1  0.729  0.120  0.696  1.0
  O  O22  1  0.228  0.871  0.308  1.0
  O  O23  1  0.375  0.791  0.596  1.0
  O  O24  1  0.619  0.125  0.411  1.0
  O  O25  1  0.047  0.164  0.623  1.0
  O  O26  1  0.941  0.915  0.403  1.0
  O  O27  1  0.553  0.274  0.156  1.0
  O  O28  1  0.512  0.683  0.874  1.0
  O  O29  1  0.546  0.913  0.125  1.0
  O  O30  1  0.488  0.102  0.863  1.0
  O  O31  1  0.913  0.899  0.101  1.0
  O  O32  1  0.077  0.085  0.888  1.0
  O  O33  1  0.181  0.233  0.273  1.0
  O  O34  1  0.717  0.807  0.572  1.0
  O  O35  1  0.665  0.648  0.182  1.0
  O  O36  1  0.322  0.359  0.876  1.0
[/CIF]
.