The crystal structure described by SrCa7Cr2Mn6O24 is (Cubic) Perovskite-derived structured and crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to one O(5), one O(7), two equivalent O(6), four equivalent O(1), and four equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Ca(2)O12 cuboctahedra, corners with eight equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(5), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(1)O12 cuboctahedra, corners with four equivalent Ca(3)O12 cuboctahedra, corners with four equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ca(2)O12 cuboctahedra, faces with two equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the second Ca site, Ca(2) is bonded to one O(5), one O(7), two equivalent O(6), four equivalent O(2), and four equivalent O(4) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(10), one O(8), two equivalent O(9), four equivalent O(1), and four equivalent O(3) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(5)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(10), one O(8), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Ca(2)O12 cuboctahedra, corners with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(10), one O(8), two equivalent O(9), four equivalent O(2), and four equivalent O(4) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(2)O12 cuboctahedra, faces with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. Cr(1) is bonded to one O(5), one O(8), two equivalent O(1), and two equivalent O(2) atoms to form CrO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second Mn site, Mn(2) is bonded to one O(10), one O(7), two equivalent O(3), and two equivalent O(4) 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 Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(3), one Ca(4), one Cr(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Cr(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Cr(1) atoms. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(1) atoms. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Cr(1) atoms. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Mn(1) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Mn(2) atoms. is represented by the CIF file [CIF]
data_SrCa7Mn6Cr2O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.645
_cell_length_b   7.613
_cell_length_c   7.613
_cell_angle_alpha   89.961
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   443.138
_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  0.250  0.251  0.251  1.0
  Ca  Ca1  1  0.250  0.251  0.749  1.0
  Ca  Ca2  1  0.250  0.749  0.251  1.0
  Ca  Ca3  1  0.250  0.749  0.749  1.0
  Ca  Ca4  1  0.750  0.251  0.251  1.0
  Ca  Ca5  1  0.750  0.251  0.749  1.0
  Ca  Ca6  1  0.750  0.749  0.251  1.0
  Ca  Ca7  1  0.750  0.749  0.749  1.0
  Mn  Mn8  1  1.000  1.000  0.500  1.0
  Mn  Mn9  1  1.000  0.500  1.000  1.0
  Mn  Mn10  1  1.000  0.500  0.500  1.0
  Mn  Mn11  1  0.500  1.000  0.500  1.0
  Mn  Mn12  1  0.500  0.500  1.000  1.0
  Mn  Mn13  1  0.500  0.500  0.500  1.0
  Cr  Cr14  1  1.000  1.000  1.000  1.0
  Cr  Cr15  1  0.500  1.000  1.000  1.0
  O  O16  1  0.997  0.999  0.250  1.0
  O  O17  1  0.001  0.999  0.750  1.0
  O  O18  1  0.998  0.502  0.250  1.0
  O  O19  1  1.000  0.500  0.750  1.0
  O  O20  1  0.503  0.999  0.250  1.0
  O  O21  1  0.499  0.999  0.750  1.0
  O  O22  1  0.502  0.502  0.250  1.0
  O  O23  1  0.500  0.500  0.750  1.0
  O  O24  1  0.250  0.998  0.998  1.0
  O  O25  1  0.250  0.998  0.502  1.0
  O  O26  1  0.250  0.502  0.998  1.0
  O  O27  1  0.250  0.502  0.502  1.0
  O  O28  1  0.750  0.000  0.000  1.0
  O  O29  1  0.750  0.000  0.500  1.0
  O  O30  1  0.750  0.500  0.000  1.0
  O  O31  1  0.750  0.500  0.500  1.0
  O  O32  1  0.997  0.250  0.999  1.0
  O  O33  1  0.998  0.250  0.502  1.0
  O  O34  1  0.001  0.750  0.999  1.0
  O  O35  1  1.000  0.750  0.500  1.0
  O  O36  1  0.503  0.250  0.999  1.0
  O  O37  1  0.502  0.250  0.502  1.0
  O  O38  1  0.499  0.750  0.999  1.0
  O  O39  1  0.500  0.750  0.500  1.0
[/CIF]
.
The crystal structure described by SrCa7Cr2Mn6O24 is (Cubic) Perovskite-derived structured and crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to one O(5), one O(7), two equivalent O(6), four equivalent O(1), and four equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Ca(2)O12 cuboctahedra, corners with eight equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. There are five inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to one O(5), one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(1)O12 cuboctahedra, corners with four equivalent Ca(3)O12 cuboctahedra, corners with four equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ca(2)O12 cuboctahedra, faces with two equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the second Ca site, Ca(2) is bonded to one O(5), one O(7), two equivalent O(6), four equivalent O(2), and four equivalent O(4) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the third Ca site, Ca(3) is bonded to one O(10), one O(8), two equivalent O(9), four equivalent O(1), and four equivalent O(3) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(5)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the fourth Ca site, Ca(4) is bonded to one O(10), one O(8), two equivalent O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with four equivalent Ca(2)O12 cuboctahedra, corners with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with two equivalent Ca(5)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the fifth Ca site, Ca(5) is bonded to one O(10), one O(8), two equivalent O(9), four equivalent O(2), and four equivalent O(4) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ca(2)O12 cuboctahedra, faces with four equivalent Ca(4)O12 cuboctahedra, faces with two equivalent Cr(1)O6 octahedra, faces with two equivalent Mn(2)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. Cr(1) is bonded to one O(5), one O(8), two equivalent O(1), and two equivalent O(2) atoms to form CrO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. In the second Mn site, Mn(2) is bonded to one O(10), one O(7), two equivalent O(3), and two equivalent O(4) 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 Sr(1)O12 cuboctahedra,  a faceface with one Ca(2)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra,  a faceface with one Ca(5)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, and faces with two equivalent Ca(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(3), one Ca(4), one Cr(1), and one Mn(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Cr(1), and one Mn(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Sr(1), one Ca(1), one Ca(3), one Ca(4), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Ca(1), one Ca(2), one Ca(4), one Ca(5), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Cr(1) atoms. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(1) atoms. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(2) atoms. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Cr(1) atoms. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Mn(1) atoms. In the tenth O site, O(10) is bonded in a distorted linear geometry to one Ca(3), one Ca(5), two equivalent Ca(4), and two equivalent Mn(2) atoms. is represented by the CIF file [CIF]
data_SrCa7Mn6Cr2O24
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.645
_cell_length_b   7.613
_cell_length_c   7.613
_cell_angle_alpha   89.961
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   443.138
_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  0.250  0.251  0.251  1.0
  Ca  Ca1  1  0.250  0.251  0.749  1.0
  Ca  Ca2  1  0.250  0.749  0.251  1.0
  Ca  Ca3  1  0.250  0.749  0.749  1.0
  Ca  Ca4  1  0.750  0.251  0.251  1.0
  Ca  Ca5  1  0.750  0.251  0.749  1.0
  Ca  Ca6  1  0.750  0.749  0.251  1.0
  Ca  Ca7  1  0.750  0.749  0.749  1.0
  Mn  Mn8  1  1.000  1.000  0.500  1.0
  Mn  Mn9  1  1.000  0.500  1.000  1.0
  Mn  Mn10  1  1.000  0.500  0.500  1.0
  Mn  Mn11  1  0.500  1.000  0.500  1.0
  Mn  Mn12  1  0.500  0.500  1.000  1.0
  Mn  Mn13  1  0.500  0.500  0.500  1.0
  Cr  Cr14  1  1.000  1.000  1.000  1.0
  Cr  Cr15  1  0.500  1.000  1.000  1.0
  O  O16  1  0.997  0.999  0.250  1.0
  O  O17  1  0.001  0.999  0.750  1.0
  O  O18  1  0.998  0.502  0.250  1.0
  O  O19  1  1.000  0.500  0.750  1.0
  O  O20  1  0.503  0.999  0.250  1.0
  O  O21  1  0.499  0.999  0.750  1.0
  O  O22  1  0.502  0.502  0.250  1.0
  O  O23  1  0.500  0.500  0.750  1.0
  O  O24  1  0.250  0.998  0.998  1.0
  O  O25  1  0.250  0.998  0.502  1.0
  O  O26  1  0.250  0.502  0.998  1.0
  O  O27  1  0.250  0.502  0.502  1.0
  O  O28  1  0.750  0.000  0.000  1.0
  O  O29  1  0.750  0.000  0.500  1.0
  O  O30  1  0.750  0.500  0.000  1.0
  O  O31  1  0.750  0.500  0.500  1.0
  O  O32  1  0.997  0.250  0.999  1.0
  O  O33  1  0.998  0.250  0.502  1.0
  O  O34  1  0.001  0.750  0.999  1.0
  O  O35  1  1.000  0.750  0.500  1.0
  O  O36  1  0.503  0.250  0.999  1.0
  O  O37  1  0.502  0.250  0.502  1.0
  O  O38  1  0.499  0.750  0.999  1.0
  O  O39  1  0.500  0.750  0.500  1.0
[/CIF]
.