The material structure described by La7Mn8O23 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic Pm space group. There are seven inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(15), two equivalent O(12), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(14), one O(6), two equivalent O(13), two equivalent O(2), and two equivalent O(5) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms. In the fourth La site, La(4) is bonded in a 12-coordinate geometry to one O(6), one O(7), two equivalent O(10), two equivalent O(13), two equivalent O(15), two equivalent O(3), and two equivalent O(5) atoms. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one O(14), one O(6), two equivalent O(11), two equivalent O(12), and two equivalent O(4) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(9), two equivalent O(10), two equivalent O(12), and two equivalent O(3) atoms. In the seventh La site, La(7) is bonded in a 6-coordinate geometry to one O(1), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(2) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(11), one O(12), one O(14), one O(2), and one O(4) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 17-25°. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(13), one O(15), one O(3), and one O(5) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 21-24°. In the third Mn site, Mn(3) is bonded to one O(11), one O(13), one O(2), one O(5), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-29°. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(12), one O(3), one O(4), one O(7), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 10-22°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(3), one La(7), and two equivalent Mn(2) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), one La(7), one Mn(1), and one Mn(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one La(1), one La(3), one La(4), one La(6), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(1), one La(5), one Mn(1), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(4), one Mn(2), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(2), one La(4), one La(5), and two equivalent Mn(3) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(1), and two equivalent Mn(4) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(3), one La(7), and two equivalent Mn(3) atoms. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one La(6) and two equivalent Mn(4) atoms. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one La(3), one La(4), one La(6), one Mn(2), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one La(5), one La(7), one Mn(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one La(1), one La(5), one La(6), one Mn(1), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(2), one La(4), one La(7), one Mn(2), and one Mn(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(2), one La(5), and two equivalent Mn(1) atoms. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(4), and two equivalent Mn(2) atoms. is represented by the CIF file [CIF]
data_La7Mn8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.895
_cell_length_b   5.561
_cell_length_c   11.120
_cell_angle_alpha   89.919
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.246
_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
  La  La0  1  0.500  0.970  0.505  1.0
  La  La1  1  0.500  0.972  0.000  1.0
  La  La2  1  0.000  0.532  0.255  1.0
  La  La3  1  0.500  0.471  0.247  1.0
  La  La4  1  0.500  0.468  0.747  1.0
  La  La5  1  0.000  0.042  0.493  1.0
  La  La6  1  0.000  0.033  0.993  1.0
  Mn  Mn7  1  0.253  0.993  0.753  1.0
  Mn  Mn8  1  0.747  0.993  0.753  1.0
  Mn  Mn9  1  0.251  0.000  0.249  1.0
  Mn  Mn10  1  0.749  0.000  0.249  1.0
  Mn  Mn11  1  0.245  0.498  0.994  1.0
  Mn  Mn12  1  0.245  0.503  0.505  1.0
  Mn  Mn13  1  0.755  0.498  0.994  1.0
  Mn  Mn14  1  0.755  0.503  0.505  1.0
  O  O15  1  0.000  0.991  0.216  1.0
  O  O16  1  0.777  0.794  0.896  1.0
  O  O17  1  0.786  0.786  0.391  1.0
  O  O18  1  0.223  0.794  0.896  1.0
  O  O19  1  0.214  0.786  0.391  1.0
  O  O20  1  0.706  0.729  0.638  1.0
  O  O21  1  0.294  0.729  0.638  1.0
  O  O22  1  0.714  0.715  0.141  1.0
  O  O23  1  0.286  0.715  0.141  1.0
  O  O24  1  0.500  0.510  0.963  1.0
  O  O25  1  0.500  0.503  0.470  1.0
  O  O26  1  0.000  0.486  0.039  1.0
  O  O27  1  0.000  0.488  0.519  1.0
  O  O28  1  0.215  0.282  0.360  1.0
  O  O29  1  0.216  0.262  0.862  1.0
  O  O30  1  0.785  0.282  0.360  1.0
  O  O31  1  0.784  0.262  0.862  1.0
  O  O32  1  0.274  0.205  0.609  1.0
  O  O33  1  0.726  0.205  0.609  1.0
  O  O34  1  0.288  0.223  0.111  1.0
  O  O35  1  0.712  0.223  0.111  1.0
  O  O36  1  0.500  0.018  0.784  1.0
  O  O37  1  0.500  0.009  0.283  1.0
[/CIF]
.
The material structure described by La7Mn8O23 is Orthorhombic Perovskite-like structured and crystallizes in the monoclinic Pm space group. There are seven inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(15), two equivalent O(12), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(14), one O(6), two equivalent O(13), two equivalent O(2), and two equivalent O(5) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(8), two equivalent O(10), two equivalent O(3), and two equivalent O(5) atoms. In the fourth La site, La(4) is bonded in a 12-coordinate geometry to one O(6), one O(7), two equivalent O(10), two equivalent O(13), two equivalent O(15), two equivalent O(3), and two equivalent O(5) atoms. In the fifth La site, La(5) is bonded in a 8-coordinate geometry to one O(14), one O(6), two equivalent O(11), two equivalent O(12), and two equivalent O(4) atoms. In the sixth La site, La(6) is bonded in a 7-coordinate geometry to one O(9), two equivalent O(10), two equivalent O(12), and two equivalent O(3) atoms. In the seventh La site, La(7) is bonded in a 6-coordinate geometry to one O(1), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(2) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(11), one O(12), one O(14), one O(2), and one O(4) atom to form MnO5 square pyramids that share corners with two equivalent Mn(3)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 17-25°. In the second Mn site, Mn(2) is bonded to one O(1), one O(10), one O(13), one O(15), one O(3), and one O(5) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 21-24°. In the third Mn site, Mn(3) is bonded to one O(11), one O(13), one O(2), one O(5), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 20-29°. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(12), one O(3), one O(4), one O(7), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and corners with two equivalent Mn(1)O5 square pyramids. The corner-sharing octahedral tilt angles range from 10-22°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one La(3), one La(7), and two equivalent Mn(2) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one La(2), one La(7), one Mn(1), and one Mn(3) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one La(1), one La(3), one La(4), one La(6), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(1), one La(5), one Mn(1), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(4), one Mn(2), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(2), one La(4), one La(5), and two equivalent Mn(3) atoms. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(4), two equivalent La(1), and two equivalent Mn(4) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(3), one La(7), and two equivalent Mn(3) atoms. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one La(6) and two equivalent Mn(4) atoms. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one La(3), one La(4), one La(6), one Mn(2), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one La(5), one La(7), one Mn(1), and one Mn(3) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one La(1), one La(5), one La(6), one Mn(1), and one Mn(4) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(2), one La(4), one La(7), one Mn(2), and one Mn(3) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(2), one La(5), and two equivalent Mn(1) atoms. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one La(1), two equivalent La(4), and two equivalent Mn(2) atoms. is represented by the CIF file [CIF]
data_La7Mn8O23
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.895
_cell_length_b   5.561
_cell_length_c   11.120
_cell_angle_alpha   89.919
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.246
_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
  La  La0  1  0.500  0.970  0.505  1.0
  La  La1  1  0.500  0.972  0.000  1.0
  La  La2  1  0.000  0.532  0.255  1.0
  La  La3  1  0.500  0.471  0.247  1.0
  La  La4  1  0.500  0.468  0.747  1.0
  La  La5  1  0.000  0.042  0.493  1.0
  La  La6  1  0.000  0.033  0.993  1.0
  Mn  Mn7  1  0.253  0.993  0.753  1.0
  Mn  Mn8  1  0.747  0.993  0.753  1.0
  Mn  Mn9  1  0.251  0.000  0.249  1.0
  Mn  Mn10  1  0.749  0.000  0.249  1.0
  Mn  Mn11  1  0.245  0.498  0.994  1.0
  Mn  Mn12  1  0.245  0.503  0.505  1.0
  Mn  Mn13  1  0.755  0.498  0.994  1.0
  Mn  Mn14  1  0.755  0.503  0.505  1.0
  O  O15  1  0.000  0.991  0.216  1.0
  O  O16  1  0.777  0.794  0.896  1.0
  O  O17  1  0.786  0.786  0.391  1.0
  O  O18  1  0.223  0.794  0.896  1.0
  O  O19  1  0.214  0.786  0.391  1.0
  O  O20  1  0.706  0.729  0.638  1.0
  O  O21  1  0.294  0.729  0.638  1.0
  O  O22  1  0.714  0.715  0.141  1.0
  O  O23  1  0.286  0.715  0.141  1.0
  O  O24  1  0.500  0.510  0.963  1.0
  O  O25  1  0.500  0.503  0.470  1.0
  O  O26  1  0.000  0.486  0.039  1.0
  O  O27  1  0.000  0.488  0.519  1.0
  O  O28  1  0.215  0.282  0.360  1.0
  O  O29  1  0.216  0.262  0.862  1.0
  O  O30  1  0.785  0.282  0.360  1.0
  O  O31  1  0.784  0.262  0.862  1.0
  O  O32  1  0.274  0.205  0.609  1.0
  O  O33  1  0.726  0.205  0.609  1.0
  O  O34  1  0.288  0.223  0.111  1.0
  O  O35  1  0.712  0.223  0.111  1.0
  O  O36  1  0.500  0.018  0.784  1.0
  O  O37  1  0.500  0.009  0.283  1.0
[/CIF]
.