The crystal structure described by SrCa7Mn6Al2O20 crystallizes in the triclinic P1 space group. Sr(1) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(17), one O(18), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are seven inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(18), one O(2), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(19), one O(20), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 9-coordinate geometry to one O(15), one O(16), one O(19), one O(2), one O(20), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(14), one O(17), one O(3), and one O(5) atom. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(17), one O(18), one O(2), and one O(4) atom. In the sixth Ca site, Ca(6) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(15), one O(16), one O(19), one O(3), and one O(5) atom. In the seventh Ca site, Ca(7) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(16), one O(19), one O(20), and one O(4) atom. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(13), one O(15), one O(2), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(5)O5 square pyramids, and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-27°. In the second Mn site, Mn(2) is bonded to one O(1), one O(12), one O(14), one O(16), one O(2), and one O(9) atom to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, and corners with two equivalent Mn(6)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 20-27°. In the third Mn site, Mn(3) is bonded to one O(17), one O(19), one O(3), one O(4), and one O(6) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(5)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with two equivalent Mn(4)O5 trigonal bipyramids. In the fourth Mn site, Mn(4) is bonded to one O(18), one O(20), one O(3), one O(4), and one O(7) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Al(2)O4 tetrahedra, corners with two equivalent Mn(3)O5 trigonal bipyramids, and corners with two equivalent Mn(6)O5 trigonal bipyramids. In the fifth Mn site, Mn(5) is bonded to one O(11), one O(17), one O(19), one O(5), and one O(8) atom to form MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Mn(6)O5 trigonal bipyramid, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 8-27°. In the sixth Mn site, Mn(6) is bonded to one O(12), one O(18), one O(20), one O(5), and one O(9) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O5 square pyramid, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 21-23°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(13), one O(15), and one O(6) atom to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 34-35°. In the second Al site, Al(2) is bonded to one O(10), one O(14), one O(16), and one O(7) atom to form AlO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Mn(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 33-40°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(4), one Ca(6), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Mn(1), and one Mn(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Ca(6), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one Ca(5), one Ca(7), one Mn(3), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Ca(6), one Mn(5), and one Mn(6) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(3), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Ca(3), one Mn(4), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(5) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(6) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(4), one Ca(6), one Al(1), and one Al(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(5), one Ca(7), one Mn(1), and one Mn(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ca(7), one Mn(2), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(1), and one Al(1) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(2), and one Al(2) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(6), one Ca(7), one Mn(1), and one Al(1) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(6), one Ca(7), one Mn(2), and one Al(2) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(4), one Ca(5), one Mn(3), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(1), one Ca(5), one Mn(4), and one Mn(6) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(3), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(3), one Ca(7), one Mn(4), and one Mn(6) atom. is represented by the CIF card [CIF]
data_SrCa7Mn6Al2O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.761
_cell_length_b   7.751
_cell_length_c   7.648
_cell_angle_alpha   89.983
_cell_angle_beta   90.238
_cell_angle_gamma   89.701
_symmetry_Int_Tables_number   1
_cell_volume   460.100
_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  0.270  0.260  0.239  1.0
  Ca  Ca1  1  0.205  0.240  0.741  1.0
  Ca  Ca2  1  0.306  0.741  0.223  1.0
  Ca  Ca3  1  0.212  0.749  0.737  1.0
  Ca  Ca4  1  0.753  0.265  0.246  1.0
  Ca  Ca5  1  0.745  0.263  0.737  1.0
  Ca  Ca6  1  0.759  0.744  0.241  1.0
  Ca  Ca7  1  0.736  0.737  0.741  1.0
  Mn  Mn8  1  0.990  0.503  0.977  1.0
  Mn  Mn9  1  0.984  0.507  0.485  1.0
  Mn  Mn10  1  0.507  0.999  0.990  1.0
  Mn  Mn11  1  0.487  0.998  0.524  1.0
  Mn  Mn12  1  0.506  0.498  0.995  1.0
  Mn  Mn13  1  0.486  0.504  0.494  1.0
  Al  Al14  1  0.021  0.995  0.014  1.0
  Al  Al15  1  0.005  0.997  0.464  1.0
  O  O16  1  0.944  0.495  0.231  1.0
  O  O17  1  0.044  0.498  0.729  1.0
  O  O18  1  0.532  0.981  0.264  1.0
  O  O19  1  0.600  0.007  0.754  1.0
  O  O20  1  0.535  0.514  0.247  1.0
  O  O21  1  0.246  0.992  0.990  1.0
  O  O22  1  0.219  0.996  0.547  1.0
  O  O23  1  0.252  0.505  0.003  1.0
  O  O24  1  0.236  0.523  0.441  1.0
  O  O25  1  0.966  0.001  0.237  1.0
  O  O26  1  0.739  0.496  0.927  1.0
  O  O27  1  0.728  0.496  0.535  1.0
  O  O28  1  0.963  0.201  0.936  1.0
  O  O29  1  0.934  0.207  0.514  1.0
  O  O30  1  0.954  0.792  0.942  1.0
  O  O31  1  0.920  0.795  0.517  1.0
  O  O32  1  0.515  0.248  0.009  1.0
  O  O33  1  0.464  0.257  0.535  1.0
  O  O34  1  0.514  0.750  0.987  1.0
  O  O35  1  0.476  0.745  0.556  1.0
[/CIF]
.
The crystal structure described by SrCa7Mn6Al2O20 crystallizes in the triclinic P1 space group. Sr(1) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(17), one O(18), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are seven inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 7-coordinate geometry to one O(13), one O(14), one O(18), one O(2), one O(6), one O(7), and one O(8) atom. In the second Ca site, Ca(2) is bonded in a 7-coordinate geometry to one O(19), one O(20), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the third Ca site, Ca(3) is bonded in a 9-coordinate geometry to one O(15), one O(16), one O(19), one O(2), one O(20), one O(6), one O(7), one O(8), and one O(9) atom. In the fourth Ca site, Ca(4) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(14), one O(17), one O(3), and one O(5) atom. In the fifth Ca site, Ca(5) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(17), one O(18), one O(2), and one O(4) atom. In the sixth Ca site, Ca(6) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(15), one O(16), one O(19), one O(3), and one O(5) atom. In the seventh Ca site, Ca(7) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(15), one O(16), one O(19), one O(20), and one O(4) atom. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(13), one O(15), one O(2), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(5)O5 square pyramids, and corners with two equivalent Al(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-27°. In the second Mn site, Mn(2) is bonded to one O(1), one O(12), one O(14), one O(16), one O(2), and one O(9) atom to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Al(2)O4 tetrahedra, and corners with two equivalent Mn(6)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 20-27°. In the third Mn site, Mn(3) is bonded to one O(17), one O(19), one O(3), one O(4), and one O(6) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(5)O5 square pyramids,  a cornercorner with one Al(1)O4 tetrahedra, and corners with two equivalent Mn(4)O5 trigonal bipyramids. In the fourth Mn site, Mn(4) is bonded to one O(18), one O(20), one O(3), one O(4), and one O(7) atom to form MnO5 trigonal bipyramids that share  a cornercorner with one Al(2)O4 tetrahedra, corners with two equivalent Mn(3)O5 trigonal bipyramids, and corners with two equivalent Mn(6)O5 trigonal bipyramids. In the fifth Mn site, Mn(5) is bonded to one O(11), one O(17), one O(19), one O(5), and one O(8) atom to form MnO5 square pyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Mn(6)O5 trigonal bipyramid, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 8-27°. In the sixth Mn site, Mn(6) is bonded to one O(12), one O(18), one O(20), one O(5), and one O(9) atom to form MnO5 trigonal bipyramids that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O5 square pyramid, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 21-23°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(10), one O(13), one O(15), and one O(6) atom to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Al(2)O4 tetrahedra, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 34-35°. In the second Al site, Al(2) is bonded to one O(10), one O(14), one O(16), and one O(7) atom to form AlO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, and  a cornercorner with one Mn(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 33-40°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(4), one Ca(6), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Ca(5), one Mn(1), and one Mn(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Ca(6), one Mn(3), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a distorted tetrahedral geometry to one Ca(5), one Ca(7), one Mn(3), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(2), one Ca(4), one Ca(6), one Mn(5), and one Mn(6) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(3), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Ca(1), one Ca(3), one Mn(4), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(5) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(2), one Ca(3), one Mn(2), and one Mn(6) atom. In the tenth O site, O(10) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(4), one Ca(6), one Al(1), and one Al(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Ca(5), one Ca(7), one Mn(1), and one Mn(5) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(5), one Ca(7), one Mn(2), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(1), and one Al(1) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one Ca(1), one Ca(4), one Ca(5), one Mn(2), and one Al(2) atom. In the fifteenth O site, O(15) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(6), one Ca(7), one Mn(1), and one Al(1) atom. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Ca(3), one Ca(6), one Ca(7), one Mn(2), and one Al(2) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(4), one Ca(5), one Mn(3), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Sr(1), one Ca(1), one Ca(5), one Mn(4), and one Mn(6) atom. In the nineteenth O site, O(19) is bonded in a 6-coordinate geometry to one Ca(2), one Ca(3), one Ca(6), one Ca(7), one Mn(3), and one Mn(5) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Ca(2), one Ca(3), one Ca(7), one Mn(4), and one Mn(6) atom. is represented by the CIF card [CIF]
data_SrCa7Mn6Al2O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.761
_cell_length_b   7.751
_cell_length_c   7.648
_cell_angle_alpha   89.983
_cell_angle_beta   90.238
_cell_angle_gamma   89.701
_symmetry_Int_Tables_number   1
_cell_volume   460.100
_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  0.270  0.260  0.239  1.0
  Ca  Ca1  1  0.205  0.240  0.741  1.0
  Ca  Ca2  1  0.306  0.741  0.223  1.0
  Ca  Ca3  1  0.212  0.749  0.737  1.0
  Ca  Ca4  1  0.753  0.265  0.246  1.0
  Ca  Ca5  1  0.745  0.263  0.737  1.0
  Ca  Ca6  1  0.759  0.744  0.241  1.0
  Ca  Ca7  1  0.736  0.737  0.741  1.0
  Mn  Mn8  1  0.990  0.503  0.977  1.0
  Mn  Mn9  1  0.984  0.507  0.485  1.0
  Mn  Mn10  1  0.507  0.999  0.990  1.0
  Mn  Mn11  1  0.487  0.998  0.524  1.0
  Mn  Mn12  1  0.506  0.498  0.995  1.0
  Mn  Mn13  1  0.486  0.504  0.494  1.0
  Al  Al14  1  0.021  0.995  0.014  1.0
  Al  Al15  1  0.005  0.997  0.464  1.0
  O  O16  1  0.944  0.495  0.231  1.0
  O  O17  1  0.044  0.498  0.729  1.0
  O  O18  1  0.532  0.981  0.264  1.0
  O  O19  1  0.600  0.007  0.754  1.0
  O  O20  1  0.535  0.514  0.247  1.0
  O  O21  1  0.246  0.992  0.990  1.0
  O  O22  1  0.219  0.996  0.547  1.0
  O  O23  1  0.252  0.505  0.003  1.0
  O  O24  1  0.236  0.523  0.441  1.0
  O  O25  1  0.966  0.001  0.237  1.0
  O  O26  1  0.739  0.496  0.927  1.0
  O  O27  1  0.728  0.496  0.535  1.0
  O  O28  1  0.963  0.201  0.936  1.0
  O  O29  1  0.934  0.207  0.514  1.0
  O  O30  1  0.954  0.792  0.942  1.0
  O  O31  1  0.920  0.795  0.517  1.0
  O  O32  1  0.515  0.248  0.009  1.0
  O  O33  1  0.464  0.257  0.535  1.0
  O  O34  1  0.514  0.750  0.987  1.0
  O  O35  1  0.476  0.745  0.556  1.0
[/CIF]
.