The compound described by La12Cu6O25 is (La,Ba)CuO4-like structured and crystallizes in the monoclinic C2 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(13), one O(2), one O(3), one O(4), one O(6), one O(8), one O(9), and two equivalent O(10) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(4), one O(5), one O(7), two equivalent O(12), and two equivalent O(3) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(4), one O(5), one O(7), and two equivalent O(2) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(7), one O(8), one O(9), and two equivalent O(10) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(4), one O(6), one O(8), and two equivalent O(11) atoms. In the sixth La site, La(6) is bonded in a 10-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(3), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-5°. In the second Cu site, Cu(2) is bonded to one O(10), one O(11), one O(13), one O(15), one O(6), and one O(8) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-17°. In the third Cu site, Cu(3) is bonded to one O(12), one O(13), one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(2), two equivalent La(3), and two equivalent Cu(1) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(8)La4Cu2 octahedra, corners with four equivalent O(12)La5Cu octahedra, corners with two equivalent O(14)La4 tetrahedra, edges with two equivalent O(5)La4Cu2 octahedra, faces with two equivalent O(4)La4Cu2 octahedra, faces with two equivalent O(7)La4Cu2 octahedra, faces with two equivalent O(2)La5Cu octahedra, and faces with two equivalent O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-50°. In the second O site, O(2) is bonded to one La(1), one La(4), one La(5), two equivalent La(3), and one Cu(1) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra,  a cornercorner with one O(7)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(5)La4Cu2 octahedra, corners with three equivalent O(13)La4Cu2 octahedra, corners with two equivalent O(14)La4 tetrahedra,  an edgeedge with one O(12)La5Cu octahedra,  an edgeedge with one O(2)La5Cu octahedra,  an edgeedge with one O(3)La5Cu octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the third O site, O(3) is bonded to one La(1), one La(5), one La(6), two equivalent La(2), and one Cu(1) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra,  a cornercorner with one O(7)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(2)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(5)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with three equivalent O(13)La4Cu2 octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(2)La5Cu octahedra,  an edgeedge with one O(3)La5Cu octahedra, edges with two equivalent O(12)La5Cu octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), one La(5), one Cu(1), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(12)La5Cu octahedra, corners with two equivalent O(7)La4Cu2 octahedra, corners with two equivalent O(2)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(7)La4Cu2 octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra,  a faceface with one O(8)La4Cu2 octahedra,  a faceface with one O(12)La5Cu octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-52°. In the fifth O site, O(5) is bonded to two equivalent La(2), two equivalent La(3), and two equivalent Cu(3) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(13)La4Cu2 octahedra, corners with four equivalent O(2)La5Cu octahedra, corners with four equivalent O(3)La5Cu octahedra, edges with two equivalent O(1)La4Cu2 octahedra,  an edgeedge with one O(14)La4 tetrahedra, faces with two equivalent O(4)La4Cu2 octahedra, faces with two equivalent O(7)La4Cu2 octahedra, and faces with two equivalent O(12)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent La(1), two equivalent La(5), and two equivalent Cu(2) atoms. In the seventh O site, O(7) is bonded to one La(2), one La(3), one La(4), one La(6), one Cu(1), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(2)La5Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with two equivalent O(14)La4 tetrahedra,  an edgeedge with one O(15)La4Cu2 octahedra,  an edgeedge with one O(4)La4Cu2 octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra,  a faceface with one O(8)La4Cu2 octahedra,  a faceface with one O(12)La5Cu octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-51°. In the eighth O site, O(8) is bonded to one La(1), one La(4), one La(5), one La(6), one Cu(1), and one Cu(2) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(1)La4Cu2 octahedra,  a cornercorner with one O(13)La4Cu2 octahedra,  a cornercorner with one O(2)La5Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with three equivalent O(12)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra, edges with two equivalent O(13)La4Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), one La(4), one La(6), and one Cu(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(4), and one Cu(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(3), two equivalent La(5), two equivalent La(6), and one Cu(2) atom. In the twelfth O site, O(12) is bonded to one La(4), one La(5), one La(6), two equivalent La(2), and one Cu(3) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(13)La4Cu2 octahedra,  a cornercorner with one O(4)La4Cu2 octahedra, corners with two equivalent O(1)La4Cu2 octahedra, corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(7)La4Cu2 octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with three equivalent O(8)La4Cu2 octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(12)La5Cu octahedra,  an edgeedge with one O(2)La5Cu octahedra, edges with two equivalent O(3)La5Cu octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra, and  a faceface with one O(7)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 22-53°. In the thirteenth O site, O(13) is bonded to one La(1), one La(4), one La(5), one La(6), one Cu(2), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(5)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(12)La5Cu octahedra, corners with three equivalent O(2)La5Cu octahedra, corners with three equivalent O(3)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra, edges with two equivalent O(8)La4Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(12)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the fourteenth O site, O(14) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form OLa4 tetrahedra that share corners with two equivalent O(1)La4Cu2 octahedra, corners with two equivalent O(13)La4Cu2 octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(8)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with four equivalent O(7)La4Cu2 octahedra, corners with four equivalent O(2)La5Cu octahedra,  an edgeedge with one O(15)La4Cu2 octahedra, and  an edgeedge with one O(5)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-69°. In the fifteenth O site, O(15) is bonded to two equivalent La(4), two equivalent La(6), and two equivalent Cu(2) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(2)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with four equivalent O(12)La5Cu octahedra, edges with two equivalent O(7)La4Cu2 octahedra,  an edgeedge with one O(14)La4 tetrahedra, faces with two equivalent O(13)La4Cu2 octahedra, and faces with two equivalent O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 43-53°. is represented by the CIF card [CIF]
data_La12Cu6O25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.911
_cell_length_b   8.911
_cell_length_c   7.676
_cell_angle_alpha   77.539
_cell_angle_beta   77.539
_cell_angle_gamma   94.156
_symmetry_Int_Tables_number   1
_cell_volume   576.556
_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  0.357  0.973  0.917  1.0
  La  La1  1  0.974  0.031  0.252  1.0
  La  La2  1  0.689  0.310  0.247  1.0
  La  La3  1  0.355  0.968  0.421  1.0
  La  La4  1  0.027  0.643  0.083  1.0
  La  La5  1  0.311  0.363  0.082  1.0
  La  La6  1  0.969  0.026  0.748  1.0
  La  La7  1  0.690  0.311  0.753  1.0
  La  La8  1  0.647  0.686  0.418  1.0
  La  La9  1  0.314  0.353  0.582  1.0
  La  La10  1  0.637  0.689  0.918  1.0
  La  La11  1  0.032  0.645  0.579  1.0
  Cu  Cu12  1  0.001  0.334  0.916  1.0
  Cu  Cu13  1  0.666  0.999  0.084  1.0
  Cu  Cu14  1  0.337  0.664  0.249  1.0
  Cu  Cu15  1  0.001  0.336  0.416  1.0
  Cu  Cu16  1  0.664  0.999  0.584  1.0
  Cu  Cu17  1  0.336  0.663  0.751  1.0
  O  O18  1  0.840  0.160  0.000  1.0
  O  O19  1  0.486  0.173  0.086  1.0
  O  O20  1  0.849  0.825  0.076  1.0
  O  O21  1  0.175  0.151  0.924  1.0
  O  O22  1  0.993  0.339  0.168  1.0
  O  O23  1  0.828  0.172  0.500  1.0
  O  O24  1  0.315  0.685  0.000  1.0
  O  O25  1  0.666  0.006  0.333  1.0
  O  O26  1  0.505  0.828  0.170  1.0
  O  O27  1  0.432  0.125  0.610  1.0
  O  O28  1  0.153  0.853  0.261  1.0
  O  O29  1  0.512  0.490  0.190  1.0
  O  O30  1  0.174  0.150  0.414  1.0
  O  O31  1  0.850  0.826  0.586  1.0
  O  O32  1  0.875  0.568  0.390  1.0
  O  O33  1  0.181  0.489  0.336  1.0
  O  O34  1  0.994  0.334  0.667  1.0
  O  O35  1  0.592  0.408  0.500  1.0
  O  O36  1  0.511  0.819  0.664  1.0
  O  O37  1  0.661  0.007  0.832  1.0
  O  O38  1  0.344  0.656  0.500  1.0
  O  O39  1  0.827  0.514  0.914  1.0
  O  O40  1  0.147  0.847  0.739  1.0
  O  O41  1  0.510  0.488  0.810  1.0
  O  O42  1  0.172  0.495  0.830  1.0
[/CIF]
.
The compound described by La12Cu6O25 is (La,Ba)CuO4-like structured and crystallizes in the monoclinic C2 space group. There are six inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(13), one O(2), one O(3), one O(4), one O(6), one O(8), one O(9), and two equivalent O(10) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(4), one O(5), one O(7), two equivalent O(12), and two equivalent O(3) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(14), one O(4), one O(5), one O(7), and two equivalent O(2) atoms. In the fourth La site, La(4) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(15), one O(2), one O(7), one O(8), one O(9), and two equivalent O(10) atoms. In the fifth La site, La(5) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(2), one O(3), one O(4), one O(6), one O(8), and two equivalent O(11) atoms. In the sixth La site, La(6) is bonded in a 10-coordinate geometry to one O(12), one O(13), one O(14), one O(15), one O(3), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-5°. In the second Cu site, Cu(2) is bonded to one O(10), one O(11), one O(13), one O(15), one O(6), and one O(8) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-17°. In the third Cu site, Cu(3) is bonded to one O(12), one O(13), one O(4), one O(5), one O(7), and one O(9) atom to form corner-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent La(2), two equivalent La(3), and two equivalent Cu(1) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(8)La4Cu2 octahedra, corners with four equivalent O(12)La5Cu octahedra, corners with two equivalent O(14)La4 tetrahedra, edges with two equivalent O(5)La4Cu2 octahedra, faces with two equivalent O(4)La4Cu2 octahedra, faces with two equivalent O(7)La4Cu2 octahedra, faces with two equivalent O(2)La5Cu octahedra, and faces with two equivalent O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-50°. In the second O site, O(2) is bonded to one La(1), one La(4), one La(5), two equivalent La(3), and one Cu(1) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra,  a cornercorner with one O(7)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(5)La4Cu2 octahedra, corners with three equivalent O(13)La4Cu2 octahedra, corners with two equivalent O(14)La4 tetrahedra,  an edgeedge with one O(12)La5Cu octahedra,  an edgeedge with one O(2)La5Cu octahedra,  an edgeedge with one O(3)La5Cu octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the third O site, O(3) is bonded to one La(1), one La(5), one La(6), two equivalent La(2), and one Cu(1) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(15)La4Cu2 octahedra,  a cornercorner with one O(7)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(2)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(5)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with three equivalent O(13)La4Cu2 octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(2)La5Cu octahedra,  an edgeedge with one O(3)La5Cu octahedra, edges with two equivalent O(12)La5Cu octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-53°. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), one La(5), one Cu(1), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(12)La5Cu octahedra, corners with two equivalent O(7)La4Cu2 octahedra, corners with two equivalent O(2)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(7)La4Cu2 octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra,  a faceface with one O(8)La4Cu2 octahedra,  a faceface with one O(12)La5Cu octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-52°. In the fifth O site, O(5) is bonded to two equivalent La(2), two equivalent La(3), and two equivalent Cu(3) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(13)La4Cu2 octahedra, corners with four equivalent O(2)La5Cu octahedra, corners with four equivalent O(3)La5Cu octahedra, edges with two equivalent O(1)La4Cu2 octahedra,  an edgeedge with one O(14)La4 tetrahedra, faces with two equivalent O(4)La4Cu2 octahedra, faces with two equivalent O(7)La4Cu2 octahedra, and faces with two equivalent O(12)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to two equivalent La(1), two equivalent La(5), and two equivalent Cu(2) atoms. In the seventh O site, O(7) is bonded to one La(2), one La(3), one La(4), one La(6), one Cu(1), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(2)La5Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with two equivalent O(14)La4 tetrahedra,  an edgeedge with one O(15)La4Cu2 octahedra,  an edgeedge with one O(4)La4Cu2 octahedra,  a faceface with one O(1)La4Cu2 octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra,  a faceface with one O(8)La4Cu2 octahedra,  a faceface with one O(12)La5Cu octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-51°. In the eighth O site, O(8) is bonded to one La(1), one La(4), one La(5), one La(6), one Cu(1), and one Cu(2) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(1)La4Cu2 octahedra,  a cornercorner with one O(13)La4Cu2 octahedra,  a cornercorner with one O(2)La5Cu octahedra,  a cornercorner with one O(3)La5Cu octahedra, corners with three equivalent O(12)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra, edges with two equivalent O(13)La4Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra,  a faceface with one O(2)La5Cu octahedra, and  a faceface with one O(3)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(1), one La(4), one La(6), and one Cu(3) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one La(2), two equivalent La(1), two equivalent La(4), and one Cu(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(3), two equivalent La(5), two equivalent La(6), and one Cu(2) atom. In the twelfth O site, O(12) is bonded to one La(4), one La(5), one La(6), two equivalent La(2), and one Cu(3) atom to form distorted OLa5Cu octahedra that share  a cornercorner with one O(13)La4Cu2 octahedra,  a cornercorner with one O(4)La4Cu2 octahedra, corners with two equivalent O(1)La4Cu2 octahedra, corners with two equivalent O(15)La4Cu2 octahedra, corners with two equivalent O(7)La4Cu2 octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with three equivalent O(8)La4Cu2 octahedra,  a cornercorner with one O(14)La4 tetrahedra,  an edgeedge with one O(12)La5Cu octahedra,  an edgeedge with one O(2)La5Cu octahedra, edges with two equivalent O(3)La5Cu octahedra,  a faceface with one O(13)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(5)La4Cu2 octahedra, and  a faceface with one O(7)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 22-53°. In the thirteenth O site, O(13) is bonded to one La(1), one La(4), one La(5), one La(6), one Cu(2), and one Cu(3) atom to form distorted OLa4Cu2 octahedra that share  a cornercorner with one O(5)La4Cu2 octahedra,  a cornercorner with one O(8)La4Cu2 octahedra,  a cornercorner with one O(12)La5Cu octahedra, corners with three equivalent O(2)La5Cu octahedra, corners with three equivalent O(3)La5Cu octahedra,  a cornercorner with one O(14)La4 tetrahedra, edges with two equivalent O(8)La4Cu2 octahedra,  a faceface with one O(15)La4Cu2 octahedra,  a faceface with one O(4)La4Cu2 octahedra,  a faceface with one O(7)La4Cu2 octahedra, and  a faceface with one O(12)La5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-53°. In the fourteenth O site, O(14) is bonded to two equivalent La(3) and two equivalent La(6) atoms to form OLa4 tetrahedra that share corners with two equivalent O(1)La4Cu2 octahedra, corners with two equivalent O(13)La4Cu2 octahedra, corners with two equivalent O(4)La4Cu2 octahedra, corners with two equivalent O(8)La4Cu2 octahedra, corners with two equivalent O(12)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with four equivalent O(7)La4Cu2 octahedra, corners with four equivalent O(2)La5Cu octahedra,  an edgeedge with one O(15)La4Cu2 octahedra, and  an edgeedge with one O(5)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 8-69°. In the fifteenth O site, O(15) is bonded to two equivalent La(4), two equivalent La(6), and two equivalent Cu(2) atoms to form distorted OLa4Cu2 octahedra that share corners with two equivalent O(2)La5Cu octahedra, corners with two equivalent O(3)La5Cu octahedra, corners with four equivalent O(12)La5Cu octahedra, edges with two equivalent O(7)La4Cu2 octahedra,  an edgeedge with one O(14)La4 tetrahedra, faces with two equivalent O(13)La4Cu2 octahedra, and faces with two equivalent O(8)La4Cu2 octahedra. The corner-sharing octahedral tilt angles range from 43-53°. is represented by the CIF card [CIF]
data_La12Cu6O25
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.911
_cell_length_b   8.911
_cell_length_c   7.676
_cell_angle_alpha   77.539
_cell_angle_beta   77.539
_cell_angle_gamma   94.156
_symmetry_Int_Tables_number   1
_cell_volume   576.556
_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  0.357  0.973  0.917  1.0
  La  La1  1  0.974  0.031  0.252  1.0
  La  La2  1  0.689  0.310  0.247  1.0
  La  La3  1  0.355  0.968  0.421  1.0
  La  La4  1  0.027  0.643  0.083  1.0
  La  La5  1  0.311  0.363  0.082  1.0
  La  La6  1  0.969  0.026  0.748  1.0
  La  La7  1  0.690  0.311  0.753  1.0
  La  La8  1  0.647  0.686  0.418  1.0
  La  La9  1  0.314  0.353  0.582  1.0
  La  La10  1  0.637  0.689  0.918  1.0
  La  La11  1  0.032  0.645  0.579  1.0
  Cu  Cu12  1  0.001  0.334  0.916  1.0
  Cu  Cu13  1  0.666  0.999  0.084  1.0
  Cu  Cu14  1  0.337  0.664  0.249  1.0
  Cu  Cu15  1  0.001  0.336  0.416  1.0
  Cu  Cu16  1  0.664  0.999  0.584  1.0
  Cu  Cu17  1  0.336  0.663  0.751  1.0
  O  O18  1  0.840  0.160  0.000  1.0
  O  O19  1  0.486  0.173  0.086  1.0
  O  O20  1  0.849  0.825  0.076  1.0
  O  O21  1  0.175  0.151  0.924  1.0
  O  O22  1  0.993  0.339  0.168  1.0
  O  O23  1  0.828  0.172  0.500  1.0
  O  O24  1  0.315  0.685  0.000  1.0
  O  O25  1  0.666  0.006  0.333  1.0
  O  O26  1  0.505  0.828  0.170  1.0
  O  O27  1  0.432  0.125  0.610  1.0
  O  O28  1  0.153  0.853  0.261  1.0
  O  O29  1  0.512  0.490  0.190  1.0
  O  O30  1  0.174  0.150  0.414  1.0
  O  O31  1  0.850  0.826  0.586  1.0
  O  O32  1  0.875  0.568  0.390  1.0
  O  O33  1  0.181  0.489  0.336  1.0
  O  O34  1  0.994  0.334  0.667  1.0
  O  O35  1  0.592  0.408  0.500  1.0
  O  O36  1  0.511  0.819  0.664  1.0
  O  O37  1  0.661  0.007  0.832  1.0
  O  O38  1  0.344  0.656  0.500  1.0
  O  O39  1  0.827  0.514  0.914  1.0
  O  O40  1  0.147  0.847  0.739  1.0
  O  O41  1  0.510  0.488  0.810  1.0
  O  O42  1  0.172  0.495  0.830  1.0
[/CIF]
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