The material structure described by SrCa7Mn6Al2O23 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), four equivalent O(6), and four equivalent O(7) atoms. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(5), two equivalent O(3), four equivalent O(6), and four equivalent O(7) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(5)O12 cuboctahedra, faces with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. In the second Ca site, Ca(2) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. In the third Ca site, Ca(3) is bonded to one O(1), one O(5), two equivalent O(3), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. In the fourth Ca site, Ca(4) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), four equivalent O(8), and four equivalent O(9) atoms. In the fifth Ca site, Ca(5) is bonded to one O(1), one O(5), two equivalent O(3), four equivalent O(8), and four equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(1)O12 cuboctahedra, faces with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Al(1)O5 square pyramids,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the second Mn site, Mn(2) is bonded to one O(4), one O(5), two equivalent O(7), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. Al(1) is bonded to one O(1), two equivalent O(6), and two equivalent O(8) atoms to form distorted AlO5 square pyramids that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Al(1)O5 square pyramid,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 14-17°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(1), one Ca(4), two equivalent Ca(2), and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OCa4Mn2 octahedra. The corner-sharing octahedral tilt angles are 4°. In the fourth O site, O(4) is bonded to one Sr(1), one Ca(4), two equivalent Ca(2), and two equivalent Mn(2) atoms to form distorted corner-sharing OSrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the fifth O site, O(5) is bonded to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Mn(2) atoms to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(4)SrCa3Mn2 octahedra and edges with four equivalent O(3)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Al(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ca(2), one Ca(3), one Ca(4), one Ca(5), one Mn(1), and one Al(1) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ca(2), one Ca(3), one Ca(4), one Ca(5), one Mn(1), and one Mn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrCa7Mn6Al2O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.552
_cell_length_b   7.552
_cell_length_c   7.697
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.005
_symmetry_Int_Tables_number   1
_cell_volume   439.010
_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  0.254  0.254  0.250  1.0
  Ca  Ca1  1  0.259  0.259  0.750  1.0
  Ca  Ca2  1  0.259  0.743  0.250  1.0
  Ca  Ca3  1  0.259  0.743  0.750  1.0
  Ca  Ca4  1  0.743  0.259  0.250  1.0
  Ca  Ca5  1  0.743  0.259  0.750  1.0
  Ca  Ca6  1  0.743  0.743  0.250  1.0
  Ca  Ca7  1  0.742  0.742  0.750  1.0
  Mn  Mn8  1  0.999  0.502  0.004  1.0
  Mn  Mn9  1  0.999  0.502  0.496  1.0
  Mn  Mn10  1  0.502  0.999  0.004  1.0
  Mn  Mn11  1  0.502  0.999  0.496  1.0
  Mn  Mn12  1  0.501  0.501  1.000  1.0
  Mn  Mn13  1  0.501  0.501  0.500  1.0
  Al  Al14  1  0.999  0.999  0.975  1.0
  Al  Al15  1  0.999  0.999  0.525  1.0
  O  O16  1  0.997  0.997  0.750  1.0
  O  O17  1  0.996  0.500  0.250  1.0
  O  O18  1  0.998  0.502  0.750  1.0
  O  O19  1  0.500  0.996  0.250  1.0
  O  O20  1  0.502  0.998  0.750  1.0
  O  O21  1  0.504  0.504  0.250  1.0
  O  O22  1  0.501  0.501  0.750  1.0
  O  O23  1  0.242  0.996  0.019  1.0
  O  O24  1  0.242  0.996  0.481  1.0
  O  O25  1  0.250  0.504  0.993  1.0
  O  O26  1  0.250  0.504  0.507  1.0
  O  O27  1  0.758  0.998  0.025  1.0
  O  O28  1  0.758  0.998  0.475  1.0
  O  O29  1  0.750  0.501  0.996  1.0
  O  O30  1  0.750  0.501  0.504  1.0
  O  O31  1  0.996  0.242  0.019  1.0
  O  O32  1  0.996  0.242  0.481  1.0
  O  O33  1  0.998  0.758  0.025  1.0
  O  O34  1  0.998  0.758  0.475  1.0
  O  O35  1  0.504  0.250  0.993  1.0
  O  O36  1  0.504  0.250  0.507  1.0
  O  O37  1  0.501  0.750  0.996  1.0
  O  O38  1  0.501  0.750  0.504  1.0
[/CIF]
.
The material structure described by SrCa7Mn6Al2O23 crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), four equivalent O(6), and four equivalent O(7) atoms. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(1), one O(5), two equivalent O(3), four equivalent O(6), and four equivalent O(7) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(5)O12 cuboctahedra, faces with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. In the second Ca site, Ca(2) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. In the third Ca site, Ca(3) is bonded to one O(1), one O(5), two equivalent O(3), two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. In the fourth Ca site, Ca(4) is bonded in a distorted q6 geometry to one O(4), two equivalent O(2), four equivalent O(8), and four equivalent O(9) atoms. In the fifth Ca site, Ca(5) is bonded to one O(1), one O(5), two equivalent O(3), four equivalent O(8), and four equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(1)O12 cuboctahedra, faces with four equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Mn(2)O6 octahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with two equivalent Al(1)O5 square pyramids. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2), one O(3), one O(6), one O(7), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Al(1)O5 square pyramids,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the second Mn site, Mn(2) is bonded to one O(4), one O(5), two equivalent O(7), and two equivalent O(9) atoms to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-4°. Al(1) is bonded to one O(1), two equivalent O(6), and two equivalent O(8) atoms to form distorted AlO5 square pyramids that share corners with four equivalent Mn(1)O6 octahedra,  a cornercorner with one Al(1)O5 square pyramid,  a faceface with one Ca(1)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, and faces with two equivalent Ca(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 14-17°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to one Sr(1), one Ca(4), two equivalent Ca(2), and two equivalent Mn(1) atoms. In the third O site, O(3) is bonded to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OCa4Mn2 octahedra. The corner-sharing octahedral tilt angles are 4°. In the fourth O site, O(4) is bonded to one Sr(1), one Ca(4), two equivalent Ca(2), and two equivalent Mn(2) atoms to form distorted corner-sharing OSrCa3Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the fifth O site, O(5) is bonded to one Ca(1), one Ca(5), two equivalent Ca(3), and two equivalent Mn(2) atoms to form distorted OCa4Mn2 octahedra that share corners with two equivalent O(4)SrCa3Mn2 octahedra and edges with four equivalent O(3)Ca4Mn2 octahedra. The corner-sharing octahedral tilt angles are 1°. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Al(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(2), one Ca(3), one Mn(1), and one Mn(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ca(2), one Ca(3), one Ca(4), one Ca(5), one Mn(1), and one Al(1) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ca(2), one Ca(3), one Ca(4), one Ca(5), one Mn(1), and one Mn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrCa7Mn6Al2O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.552
_cell_length_b   7.552
_cell_length_c   7.697
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.005
_symmetry_Int_Tables_number   1
_cell_volume   439.010
_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  0.254  0.254  0.250  1.0
  Ca  Ca1  1  0.259  0.259  0.750  1.0
  Ca  Ca2  1  0.259  0.743  0.250  1.0
  Ca  Ca3  1  0.259  0.743  0.750  1.0
  Ca  Ca4  1  0.743  0.259  0.250  1.0
  Ca  Ca5  1  0.743  0.259  0.750  1.0
  Ca  Ca6  1  0.743  0.743  0.250  1.0
  Ca  Ca7  1  0.742  0.742  0.750  1.0
  Mn  Mn8  1  0.999  0.502  0.004  1.0
  Mn  Mn9  1  0.999  0.502  0.496  1.0
  Mn  Mn10  1  0.502  0.999  0.004  1.0
  Mn  Mn11  1  0.502  0.999  0.496  1.0
  Mn  Mn12  1  0.501  0.501  1.000  1.0
  Mn  Mn13  1  0.501  0.501  0.500  1.0
  Al  Al14  1  0.999  0.999  0.975  1.0
  Al  Al15  1  0.999  0.999  0.525  1.0
  O  O16  1  0.997  0.997  0.750  1.0
  O  O17  1  0.996  0.500  0.250  1.0
  O  O18  1  0.998  0.502  0.750  1.0
  O  O19  1  0.500  0.996  0.250  1.0
  O  O20  1  0.502  0.998  0.750  1.0
  O  O21  1  0.504  0.504  0.250  1.0
  O  O22  1  0.501  0.501  0.750  1.0
  O  O23  1  0.242  0.996  0.019  1.0
  O  O24  1  0.242  0.996  0.481  1.0
  O  O25  1  0.250  0.504  0.993  1.0
  O  O26  1  0.250  0.504  0.507  1.0
  O  O27  1  0.758  0.998  0.025  1.0
  O  O28  1  0.758  0.998  0.475  1.0
  O  O29  1  0.750  0.501  0.996  1.0
  O  O30  1  0.750  0.501  0.504  1.0
  O  O31  1  0.996  0.242  0.019  1.0
  O  O32  1  0.996  0.242  0.481  1.0
  O  O33  1  0.998  0.758  0.025  1.0
  O  O34  1  0.998  0.758  0.475  1.0
  O  O35  1  0.504  0.250  0.993  1.0
  O  O36  1  0.504  0.250  0.507  1.0
  O  O37  1  0.501  0.750  0.996  1.0
  O  O38  1  0.501  0.750  0.504  1.0
[/CIF]
.