The structure described by Sr16Mn8O29 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(20), one O(29), one O(5), one O(7), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 4-coordinate geometry to one O(1), one O(21), one O(27), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(13), one O(22), one O(28), one O(3), one O(4), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one O(15), one O(23), one O(3), one O(4), and one O(7) atom. In the fifth Sr site, Sr(5) is bonded to one O(12), one O(2), one O(28), one O(6), one O(8), and one O(9) atom to form distorted SrO6 pentagonal pyramids that share  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra,  an edgeedge with one Mn(4)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 14°. In the sixth Sr site, Sr(6) is bonded in a distorted hexagonal planar geometry to one O(10), one O(14), one O(29), one O(5), one O(6), and one O(9) atom. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(15), one O(19), one O(26), one O(3), and one O(8) atom. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(17), one O(18), one O(27), one O(4), and one O(9) atom. In the ninth Sr site, Sr(9) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(15), one O(16), and one O(26) atom. In the tenth Sr site, Sr(10) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(15), one O(27), and one O(4) atom. In the eleventh Sr site, Sr(11) is bonded to one O(1), one O(11), one O(19), one O(20), one O(21), and one O(29) atom to form distorted SrO6 octahedra that share corners with two equivalent Sr(12)O6 octahedra,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Mn(4)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 5-40°. In the twelfth Sr site, Sr(12) is bonded to one O(16), one O(17), one O(2), one O(20), one O(21), and one O(28) atom to form distorted SrO6 octahedra that share  a cornercorner with one Mn(7)O6 octahedra, corners with two equivalent Sr(11)O6 octahedra,  an edgeedge with one Sr(5)O6 pentagonal pyramid,  an edgeedge with one Mn(3)O5 trigonal bipyramid,  an edgeedge with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 5-76°. In the thirteenth Sr site, Sr(13) is bonded in a 6-coordinate geometry to one O(1), one O(15), one O(18), one O(23), one O(26), and one O(27) atom. In the fourteenth Sr site, Sr(14) is bonded in a 5-coordinate geometry to one O(16), one O(2), one O(24), one O(26), and one O(27) atom. In the fifteenth Sr site, Sr(15) is bonded in a 6-coordinate geometry to one O(20), one O(23), one O(24), one O(28), one O(29), and one O(3) atom. In the sixteenth Sr site, Sr(16) is bonded in a 7-coordinate geometry to one O(18), one O(21), one O(23), one O(25), one O(28), one O(29), and one O(9) atom. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(22), one O(25), one O(4), one O(5), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Sr(5)O6 pentagonal pyramid,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  an edgeedge with one Mn(7)O6 octahedra. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(23), one O(25), one O(5), and one O(7) atom. In the third Mn site, Mn(3) is bonded to one O(10), one O(12), one O(16), one O(17), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(4)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra,  an edgeedge with one Sr(5)O6 pentagonal pyramid, and  an edgeedge with one Mn(5)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(12), one O(19), and one O(8) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(11)O6 octahedra, and  an edgeedge with one Sr(5)O6 pentagonal pyramid. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(14), one O(17), one O(18), and one O(21) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Sr(11)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 35-87°. In the sixth Mn site, Mn(6) is bonded to one O(13), one O(17), one O(19), one O(20), and one O(24) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(4)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Sr(11)O6 octahedra, and  an edgeedge with one Sr(12)O6 octahedra. The corner-sharing octahedral tilt angles are 48°. In the seventh Mn site, Mn(7) is bonded to one O(18), one O(22), one O(24), one O(25), one O(27), and one O(28) atom to form distorted MnO6 octahedra that share  a cornercorner with one Sr(12)O6 octahedra,  a cornercorner with one Sr(5)O6 pentagonal pyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 76°. In the eighth Mn site, Mn(8) is bonded in a rectangular see-saw-like geometry to one O(2), one O(22), one O(3), and one O(7) atom. There are twenty-nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(11), one Sr(13), one Sr(2), one Sr(9), and one Mn(2) atom to form distorted edge-sharing OSr5Mn pentagonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(12), one Sr(14), one Sr(5), and one Mn(8) atom. In the third O site, O(3) is bonded to one Sr(15), one Sr(3), one Sr(4), one Sr(7), and one Mn(8) atom to form distorted OSr4Mn square pyramids that share  a cornercorner with one O(24)Sr2Mn2 tetrahedra and  a cornercorner with one O(29)Sr5 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(3), one Sr(4), one Sr(8), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(6), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Mn(2), and one Mn(8) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(7), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(16), one Sr(3), one Sr(5), one Sr(6), and one Sr(8) atom. In the tenth O site, O(10) is bonded to one Sr(10), one Sr(6), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Sr(10), one Sr(11), one Sr(9), and one Mn(4) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(5), one Sr(9), one Mn(3), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a distorted square co-planar geometry to one Sr(3), one Sr(7), one Sr(8), and one Mn(6) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(6), one Sr(7), one Sr(8), and one Mn(5) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(13), one Sr(4), one Sr(7), one Sr(8), and one Sr(9) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Sr(12), one Sr(14), one Sr(9), and one Mn(3) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(8), one Mn(3), one Mn(5), and one Mn(6) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(13), one Sr(16), one Sr(8), one Mn(5), and one Mn(7) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(11), one Sr(7), one Mn(4), and one Mn(6) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(11), one Sr(12), one Sr(15), and one Mn(6) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Sr(11), one Sr(12), one Sr(16), one Sr(2), and one Mn(5) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one Sr(3), one Mn(1), one Mn(7), and one Mn(8) atom. In the twenty-third O site, O(23) is bonded in a 5-coordinate geometry to one Sr(13), one Sr(15), one Sr(16), one Sr(4), and one Mn(2) atom. In the twenty-fourth O site, O(24) is bonded to one Sr(14), one Sr(15), one Mn(6), and one Mn(7) atom to form distorted OSr2Mn2 tetrahedra that share  a cornercorner with one O(3)Sr4Mn square pyramid and  a cornercorner with one O(29)Sr5 trigonal bipyramid. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Sr(16), one Mn(1), one Mn(2), and one Mn(7) atom. In the twenty-sixth O site, O(26) is bonded in a rectangular see-saw-like geometry to one Sr(13), one Sr(14), one Sr(7), and one Sr(9) atom. In the twenty-seventh O site, O(27) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(13), one Sr(14), one Sr(2), one Sr(8), and one Mn(7) atom. In the twenty-eighth O site, O(28) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(15), one Sr(16), one Sr(3), one Sr(5), and one Mn(7) atom. In the twenty-ninth O site, O(29) is bonded to one Sr(1), one Sr(11), one Sr(15), one Sr(16), and one Sr(6) atom to form OSr5 trigonal bipyramids that share  a cornercorner with one O(3)Sr4Mn square pyramid,  a cornercorner with one O(10)Sr2Mn2 tetrahedra,  a cornercorner with one O(24)Sr2Mn2 tetrahedra, and  an edgeedge with one O(1)Sr5Mn pentagonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr16Mn8O29
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.492
_cell_length_b   9.530
_cell_length_c   9.755
_cell_angle_alpha   79.792
_cell_angle_beta   79.389
_cell_angle_gamma   78.482
_symmetry_Int_Tables_number   1
_cell_volume   840.794
_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  0.697  0.631  0.010  1.0
  Sr  Sr1  1  0.297  0.766  0.891  1.0
  Sr  Sr2  1  0.062  0.149  0.218  1.0
  Sr  Sr3  1  0.529  0.060  0.240  1.0
  Sr  Sr4  1  0.036  0.519  0.173  1.0
  Sr  Sr5  1  0.410  0.502  0.247  1.0
  Sr  Sr6  1  0.723  0.219  0.426  1.0
  Sr  Sr7  1  0.243  0.198  0.474  1.0
  Sr  Sr8  1  0.743  0.834  0.531  1.0
  Sr  Sr9  1  0.341  0.827  0.517  1.0
  Sr  Sr10  1  0.586  0.539  0.737  1.0
  Sr  Sr11  1  0.043  0.538  0.795  1.0
  Sr  Sr12  1  0.502  0.058  0.707  1.0
  Sr  Sr13  1  0.958  0.947  0.730  1.0
  Sr  Sr14  1  0.779  0.249  0.969  1.0
  Sr  Sr15  1  0.361  0.306  0.970  1.0
  Mn  Mn16  1  0.239  0.864  0.161  1.0
  Mn  Mn17  1  0.521  0.924  0.004  1.0
  Mn  Mn18  1  0.087  0.645  0.442  1.0
  Mn  Mn19  1  0.736  0.564  0.391  1.0
  Mn  Mn20  1  0.329  0.436  0.608  1.0
  Mn  Mn21  1  0.923  0.336  0.622  1.0
  Mn  Mn22  1  0.158  0.134  0.856  1.0
  Mn  Mn23  1  0.876  0.887  0.105  1.0
  O  O24  1  0.563  0.787  0.810  1.0
  O  O25  1  0.950  0.727  0.981  1.0
  O  O26  1  0.803  0.062  0.205  1.0
  O  O27  1  0.259  0.979  0.312  1.0
  O  O28  1  0.434  0.755  0.102  1.0
  O  O29  1  0.170  0.684  0.237  1.0
  O  O30  1  0.678  0.853  0.117  1.0
  O  O31  1  0.775  0.472  0.234  1.0
  O  O32  1  0.254  0.331  0.218  1.0
  O  O33  1  0.284  0.604  0.472  1.0
  O  O34  1  0.584  0.670  0.482  1.0
  O  O35  1  0.896  0.655  0.364  1.0
  O  O36  1  0.981  0.229  0.468  1.0
  O  O37  1  0.455  0.332  0.468  1.0
  O  O38  1  0.512  0.996  0.477  1.0
  O  O39  1  0.005  0.748  0.597  1.0
  O  O40  1  0.086  0.434  0.566  1.0
  O  O41  1  0.307  0.263  0.738  1.0
  O  O42  1  0.748  0.421  0.543  1.0
  O  O43  1  0.831  0.450  0.778  1.0
  O  O44  1  0.313  0.552  0.765  1.0
  O  O45  1  0.064  0.944  0.068  1.0
  O  O46  1  0.580  0.105  0.949  1.0
  O  O47  1  0.983  0.185  0.765  1.0
  O  O48  1  0.316  0.016  0.994  1.0
  O  O49  1  0.756  0.043  0.621  1.0
  O  O50  1  0.227  0.980  0.729  1.0
  O  O51  1  0.079  0.285  0.978  1.0
  O  O52  1  0.557  0.434  0.005  1.0
[/CIF]
.
The structure described by Sr16Mn8O29 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(20), one O(29), one O(5), one O(7), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 4-coordinate geometry to one O(1), one O(21), one O(27), and one O(5) atom. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one O(13), one O(22), one O(28), one O(3), one O(4), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one O(15), one O(23), one O(3), one O(4), and one O(7) atom. In the fifth Sr site, Sr(5) is bonded to one O(12), one O(2), one O(28), one O(6), one O(8), and one O(9) atom to form distorted SrO6 pentagonal pyramids that share  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra,  an edgeedge with one Mn(4)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 14°. In the sixth Sr site, Sr(6) is bonded in a distorted hexagonal planar geometry to one O(10), one O(14), one O(29), one O(5), one O(6), and one O(9) atom. In the seventh Sr site, Sr(7) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(15), one O(19), one O(26), one O(3), and one O(8) atom. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(17), one O(18), one O(27), one O(4), and one O(9) atom. In the ninth Sr site, Sr(9) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(12), one O(15), one O(16), and one O(26) atom. In the tenth Sr site, Sr(10) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(15), one O(27), and one O(4) atom. In the eleventh Sr site, Sr(11) is bonded to one O(1), one O(11), one O(19), one O(20), one O(21), and one O(29) atom to form distorted SrO6 octahedra that share corners with two equivalent Sr(12)O6 octahedra,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Mn(4)O4 tetrahedra, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 5-40°. In the twelfth Sr site, Sr(12) is bonded to one O(16), one O(17), one O(2), one O(20), one O(21), and one O(28) atom to form distorted SrO6 octahedra that share  a cornercorner with one Mn(7)O6 octahedra, corners with two equivalent Sr(11)O6 octahedra,  an edgeedge with one Sr(5)O6 pentagonal pyramid,  an edgeedge with one Mn(3)O5 trigonal bipyramid,  an edgeedge with one Mn(5)O5 trigonal bipyramid, and  an edgeedge with one Mn(6)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 5-76°. In the thirteenth Sr site, Sr(13) is bonded in a 6-coordinate geometry to one O(1), one O(15), one O(18), one O(23), one O(26), and one O(27) atom. In the fourteenth Sr site, Sr(14) is bonded in a 5-coordinate geometry to one O(16), one O(2), one O(24), one O(26), and one O(27) atom. In the fifteenth Sr site, Sr(15) is bonded in a 6-coordinate geometry to one O(20), one O(23), one O(24), one O(28), one O(29), and one O(3) atom. In the sixteenth Sr site, Sr(16) is bonded in a 7-coordinate geometry to one O(18), one O(21), one O(23), one O(25), one O(28), one O(29), and one O(9) atom. There are eight inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(22), one O(25), one O(4), one O(5), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Sr(5)O6 pentagonal pyramid,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and  an edgeedge with one Mn(7)O6 octahedra. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(1), one O(23), one O(25), one O(5), and one O(7) atom. In the third Mn site, Mn(3) is bonded to one O(10), one O(12), one O(16), one O(17), and one O(6) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(4)O4 tetrahedra,  a cornercorner with one Mn(1)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra,  an edgeedge with one Sr(5)O6 pentagonal pyramid, and  an edgeedge with one Mn(5)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(12), one O(19), and one O(8) atom to form MnO4 tetrahedra that share  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(11)O6 octahedra, and  an edgeedge with one Sr(5)O6 pentagonal pyramid. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(14), one O(17), one O(18), and one O(21) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Sr(11)O6 octahedra,  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(6)O5 trigonal bipyramid,  an edgeedge with one Sr(12)O6 octahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 35-87°. In the sixth Mn site, Mn(6) is bonded to one O(13), one O(17), one O(19), one O(20), and one O(24) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(7)O6 octahedra,  a cornercorner with one Mn(4)O4 tetrahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  an edgeedge with one Sr(11)O6 octahedra, and  an edgeedge with one Sr(12)O6 octahedra. The corner-sharing octahedral tilt angles are 48°. In the seventh Mn site, Mn(7) is bonded to one O(18), one O(22), one O(24), one O(25), one O(27), and one O(28) atom to form distorted MnO6 octahedra that share  a cornercorner with one Sr(12)O6 octahedra,  a cornercorner with one Sr(5)O6 pentagonal pyramid,  a cornercorner with one Mn(5)O5 trigonal bipyramid,  a cornercorner with one Mn(6)O5 trigonal bipyramid, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 76°. In the eighth Mn site, Mn(8) is bonded in a rectangular see-saw-like geometry to one O(2), one O(22), one O(3), and one O(7) atom. There are twenty-nine inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(11), one Sr(13), one Sr(2), one Sr(9), and one Mn(2) atom to form distorted edge-sharing OSr5Mn pentagonal pyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(12), one Sr(14), one Sr(5), and one Mn(8) atom. In the third O site, O(3) is bonded to one Sr(15), one Sr(3), one Sr(4), one Sr(7), and one Mn(8) atom to form distorted OSr4Mn square pyramids that share  a cornercorner with one O(24)Sr2Mn2 tetrahedra and  a cornercorner with one O(29)Sr5 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(10), one Sr(3), one Sr(4), one Sr(8), and one Mn(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(6), one Mn(1), and one Mn(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(4), one Mn(2), and one Mn(8) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(5), one Sr(7), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(16), one Sr(3), one Sr(5), one Sr(6), and one Sr(8) atom. In the tenth O site, O(10) is bonded to one Sr(10), one Sr(6), one Mn(3), and one Mn(5) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the eleventh O site, O(11) is bonded in a distorted rectangular see-saw-like geometry to one Sr(10), one Sr(11), one Sr(9), and one Mn(4) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(5), one Sr(9), one Mn(3), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a distorted square co-planar geometry to one Sr(3), one Sr(7), one Sr(8), and one Mn(6) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(6), one Sr(7), one Sr(8), and one Mn(5) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(13), one Sr(4), one Sr(7), one Sr(8), and one Sr(9) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Sr(12), one Sr(14), one Sr(9), and one Mn(3) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(12), one Sr(8), one Mn(3), one Mn(5), and one Mn(6) atom. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to one Sr(13), one Sr(16), one Sr(8), one Mn(5), and one Mn(7) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(11), one Sr(7), one Mn(4), and one Mn(6) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(11), one Sr(12), one Sr(15), and one Mn(6) atom. In the twenty-first O site, O(21) is bonded in a 5-coordinate geometry to one Sr(11), one Sr(12), one Sr(16), one Sr(2), and one Mn(5) atom. In the twenty-second O site, O(22) is bonded in a 2-coordinate geometry to one Sr(3), one Mn(1), one Mn(7), and one Mn(8) atom. In the twenty-third O site, O(23) is bonded in a 5-coordinate geometry to one Sr(13), one Sr(15), one Sr(16), one Sr(4), and one Mn(2) atom. In the twenty-fourth O site, O(24) is bonded to one Sr(14), one Sr(15), one Mn(6), and one Mn(7) atom to form distorted OSr2Mn2 tetrahedra that share  a cornercorner with one O(3)Sr4Mn square pyramid and  a cornercorner with one O(29)Sr5 trigonal bipyramid. In the twenty-fifth O site, O(25) is bonded in a 3-coordinate geometry to one Sr(16), one Mn(1), one Mn(2), and one Mn(7) atom. In the twenty-sixth O site, O(26) is bonded in a rectangular see-saw-like geometry to one Sr(13), one Sr(14), one Sr(7), and one Sr(9) atom. In the twenty-seventh O site, O(27) is bonded in a 6-coordinate geometry to one Sr(10), one Sr(13), one Sr(14), one Sr(2), one Sr(8), and one Mn(7) atom. In the twenty-eighth O site, O(28) is bonded in a 6-coordinate geometry to one Sr(12), one Sr(15), one Sr(16), one Sr(3), one Sr(5), and one Mn(7) atom. In the twenty-ninth O site, O(29) is bonded to one Sr(1), one Sr(11), one Sr(15), one Sr(16), and one Sr(6) atom to form OSr5 trigonal bipyramids that share  a cornercorner with one O(3)Sr4Mn square pyramid,  a cornercorner with one O(10)Sr2Mn2 tetrahedra,  a cornercorner with one O(24)Sr2Mn2 tetrahedra, and  an edgeedge with one O(1)Sr5Mn pentagonal pyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr16Mn8O29
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.492
_cell_length_b   9.530
_cell_length_c   9.755
_cell_angle_alpha   79.792
_cell_angle_beta   79.389
_cell_angle_gamma   78.482
_symmetry_Int_Tables_number   1
_cell_volume   840.794
_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  0.697  0.631  0.010  1.0
  Sr  Sr1  1  0.297  0.766  0.891  1.0
  Sr  Sr2  1  0.062  0.149  0.218  1.0
  Sr  Sr3  1  0.529  0.060  0.240  1.0
  Sr  Sr4  1  0.036  0.519  0.173  1.0
  Sr  Sr5  1  0.410  0.502  0.247  1.0
  Sr  Sr6  1  0.723  0.219  0.426  1.0
  Sr  Sr7  1  0.243  0.198  0.474  1.0
  Sr  Sr8  1  0.743  0.834  0.531  1.0
  Sr  Sr9  1  0.341  0.827  0.517  1.0
  Sr  Sr10  1  0.586  0.539  0.737  1.0
  Sr  Sr11  1  0.043  0.538  0.795  1.0
  Sr  Sr12  1  0.502  0.058  0.707  1.0
  Sr  Sr13  1  0.958  0.947  0.730  1.0
  Sr  Sr14  1  0.779  0.249  0.969  1.0
  Sr  Sr15  1  0.361  0.306  0.970  1.0
  Mn  Mn16  1  0.239  0.864  0.161  1.0
  Mn  Mn17  1  0.521  0.924  0.004  1.0
  Mn  Mn18  1  0.087  0.645  0.442  1.0
  Mn  Mn19  1  0.736  0.564  0.391  1.0
  Mn  Mn20  1  0.329  0.436  0.608  1.0
  Mn  Mn21  1  0.923  0.336  0.622  1.0
  Mn  Mn22  1  0.158  0.134  0.856  1.0
  Mn  Mn23  1  0.876  0.887  0.105  1.0
  O  O24  1  0.563  0.787  0.810  1.0
  O  O25  1  0.950  0.727  0.981  1.0
  O  O26  1  0.803  0.062  0.205  1.0
  O  O27  1  0.259  0.979  0.312  1.0
  O  O28  1  0.434  0.755  0.102  1.0
  O  O29  1  0.170  0.684  0.237  1.0
  O  O30  1  0.678  0.853  0.117  1.0
  O  O31  1  0.775  0.472  0.234  1.0
  O  O32  1  0.254  0.331  0.218  1.0
  O  O33  1  0.284  0.604  0.472  1.0
  O  O34  1  0.584  0.670  0.482  1.0
  O  O35  1  0.896  0.655  0.364  1.0
  O  O36  1  0.981  0.229  0.468  1.0
  O  O37  1  0.455  0.332  0.468  1.0
  O  O38  1  0.512  0.996  0.477  1.0
  O  O39  1  0.005  0.748  0.597  1.0
  O  O40  1  0.086  0.434  0.566  1.0
  O  O41  1  0.307  0.263  0.738  1.0
  O  O42  1  0.748  0.421  0.543  1.0
  O  O43  1  0.831  0.450  0.778  1.0
  O  O44  1  0.313  0.552  0.765  1.0
  O  O45  1  0.064  0.944  0.068  1.0
  O  O46  1  0.580  0.105  0.949  1.0
  O  O47  1  0.983  0.185  0.765  1.0
  O  O48  1  0.316  0.016  0.994  1.0
  O  O49  1  0.756  0.043  0.621  1.0
  O  O50  1  0.227  0.980  0.729  1.0
  O  O51  1  0.079  0.285  0.978  1.0
  O  O52  1  0.557  0.434  0.005  1.0
[/CIF]
.