The compound described by CaCeFe2AlSi3O13 crystallizes in the monoclinic P2_1/m space group. Ca(1) is bonded in a 6-coordinate geometry to one O(5), one O(9), two equivalent O(2), and two equivalent O(7) atoms. Ce(1) is bonded in a 4-coordinate geometry to one O(5), one O(8), and four equivalent O(10) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), one O(6), two equivalent O(10), and two equivalent O(2) atoms to form FeO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. Al(1) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Si site, Si(2) is bonded to one O(3), one O(9), and two equivalent O(10) atoms to form SiO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, and corners with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. In the third Si site, Si(3) is bonded to one O(1), one O(6), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a trigonal non-coplanar geometry to one Ce(1) and two equivalent Al(1) atoms. In the second O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), two equivalent Fe(2), and one Si(2) atom. In the third O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Ce(1), one Fe(1), and one Si(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Fe(1), one Fe(2), and one Si(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Al(1) and one Si(2) atom. In the seventh O site, O(4) is bonded in a trigonal non-coplanar geometry to one Fe(1) and two equivalent Fe(2) atoms. In the eighth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(1), one Ce(1), and one Si(1) atom. In the ninth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one Si(3) atom. In the tenth O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Al(1), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaCeAlFe2Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.857
_cell_length_b   9.014
_cell_length_c   10.222
_cell_angle_alpha   64.823
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.396
_cell_formula_units_Z   2
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
  Ca  Ca0  1  0.250  0.620  0.150  1.0
  Ca  Ca1  1  0.750  0.380  0.850  1.0
  Ce  Ce2  1  0.250  0.193  0.438  1.0
  Ce  Ce3  1  0.750  0.807  0.562  1.0
  Al  Al4  1  0.000  0.500  0.500  1.0
  Al  Al5  1  0.500  0.500  0.500  1.0
  Fe  Fe6  1  0.250  0.922  0.773  1.0
  Fe  Fe7  1  0.750  0.078  0.227  1.0
  Fe  Fe8  1  0.000  0.000  0.000  1.0
  Fe  Fe9  1  0.500  0.000  0.000  1.0
  Si  Si10  1  0.250  0.303  0.046  1.0
  Si  Si11  1  0.750  0.697  0.954  1.0
  Si  Si12  1  0.250  0.863  0.333  1.0
  Si  Si13  1  0.750  0.137  0.667  1.0
  Si  Si14  1  0.250  0.582  0.733  1.0
  Si  Si15  1  0.750  0.418  0.267  1.0
  O  O16  1  0.250  0.492  0.913  1.0
  O  O17  1  0.750  0.508  0.087  1.0
  O  O18  1  0.012  0.213  0.034  1.0
  O  O19  1  0.988  0.787  0.966  1.0
  O  O20  1  0.512  0.787  0.966  1.0
  O  O21  1  0.488  0.213  0.034  1.0
  O  O22  1  0.250  0.661  0.418  1.0
  O  O23  1  0.750  0.339  0.582  1.0
  O  O24  1  0.250  0.073  0.866  1.0
  O  O25  1  0.750  0.927  0.134  1.0
  O  O26  1  0.250  0.325  0.196  1.0
  O  O27  1  0.750  0.675  0.804  1.0
  O  O28  1  0.250  0.778  0.674  1.0
  O  O29  1  0.750  0.222  0.326  1.0
  O  O30  1  0.021  0.524  0.674  1.0
  O  O31  1  0.979  0.476  0.326  1.0
  O  O32  1  0.521  0.476  0.326  1.0
  O  O33  1  0.479  0.524  0.674  1.0
  O  O34  1  0.250  0.351  0.546  1.0
  O  O35  1  0.750  0.649  0.454  1.0
  O  O36  1  0.250  0.896  0.160  1.0
  O  O37  1  0.750  0.104  0.840  1.0
  O  O38  1  0.028  0.945  0.377  1.0
  O  O39  1  0.972  0.055  0.623  1.0
  O  O40  1  0.528  0.055  0.623  1.0
  O  O41  1  0.472  0.945  0.377  1.0
[/CIF]
.
The compound described by CaCeFe2AlSi3O13 crystallizes in the monoclinic P2_1/m space group. Ca(1) is bonded in a 6-coordinate geometry to one O(5), one O(9), two equivalent O(2), and two equivalent O(7) atoms. Ce(1) is bonded in a 4-coordinate geometry to one O(5), one O(8), and four equivalent O(10) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(4), one O(6), two equivalent O(10), and two equivalent O(2) atoms to form FeO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and edges with two equivalent Fe(2)O6 octahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form FeO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with two equivalent Fe(2)O6 octahedra. Al(1) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent O(8) atoms to form AlO6 octahedra that share corners with two equivalent Si(2)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form SiO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Si site, Si(2) is bonded to one O(3), one O(9), and two equivalent O(10) atoms to form SiO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra, corners with two equivalent Fe(2)O6 octahedra, and corners with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-56°. In the third Si site, Si(3) is bonded to one O(1), one O(6), and two equivalent O(7) atoms to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra, corners with two equivalent Al(1)O6 octahedra, and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-55°. There are ten inequivalent O sites. In the first O site, O(8) is bonded in a trigonal non-coplanar geometry to one Ce(1) and two equivalent Al(1) atoms. In the second O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ca(1), two equivalent Fe(2), and one Si(2) atom. In the third O site, O(10) is bonded in a 4-coordinate geometry to two equivalent Ce(1), one Fe(1), and one Si(2) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1), one Fe(1), one Fe(2), and one Si(1) atom. In the sixth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Al(1) and one Si(2) atom. In the seventh O site, O(4) is bonded in a trigonal non-coplanar geometry to one Fe(1) and two equivalent Fe(2) atoms. In the eighth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(1), one Ce(1), and one Si(1) atom. In the ninth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one Si(3) atom. In the tenth O site, O(7) is bonded in a 3-coordinate geometry to one Ca(1), one Al(1), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_CaCeAlFe2Si3O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.857
_cell_length_b   9.014
_cell_length_c   10.222
_cell_angle_alpha   64.823
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   488.396
_cell_formula_units_Z   2
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
  Ca  Ca0  1  0.250  0.620  0.150  1.0
  Ca  Ca1  1  0.750  0.380  0.850  1.0
  Ce  Ce2  1  0.250  0.193  0.438  1.0
  Ce  Ce3  1  0.750  0.807  0.562  1.0
  Al  Al4  1  0.000  0.500  0.500  1.0
  Al  Al5  1  0.500  0.500  0.500  1.0
  Fe  Fe6  1  0.250  0.922  0.773  1.0
  Fe  Fe7  1  0.750  0.078  0.227  1.0
  Fe  Fe8  1  0.000  0.000  0.000  1.0
  Fe  Fe9  1  0.500  0.000  0.000  1.0
  Si  Si10  1  0.250  0.303  0.046  1.0
  Si  Si11  1  0.750  0.697  0.954  1.0
  Si  Si12  1  0.250  0.863  0.333  1.0
  Si  Si13  1  0.750  0.137  0.667  1.0
  Si  Si14  1  0.250  0.582  0.733  1.0
  Si  Si15  1  0.750  0.418  0.267  1.0
  O  O16  1  0.250  0.492  0.913  1.0
  O  O17  1  0.750  0.508  0.087  1.0
  O  O18  1  0.012  0.213  0.034  1.0
  O  O19  1  0.988  0.787  0.966  1.0
  O  O20  1  0.512  0.787  0.966  1.0
  O  O21  1  0.488  0.213  0.034  1.0
  O  O22  1  0.250  0.661  0.418  1.0
  O  O23  1  0.750  0.339  0.582  1.0
  O  O24  1  0.250  0.073  0.866  1.0
  O  O25  1  0.750  0.927  0.134  1.0
  O  O26  1  0.250  0.325  0.196  1.0
  O  O27  1  0.750  0.675  0.804  1.0
  O  O28  1  0.250  0.778  0.674  1.0
  O  O29  1  0.750  0.222  0.326  1.0
  O  O30  1  0.021  0.524  0.674  1.0
  O  O31  1  0.979  0.476  0.326  1.0
  O  O32  1  0.521  0.476  0.326  1.0
  O  O33  1  0.479  0.524  0.674  1.0
  O  O34  1  0.250  0.351  0.546  1.0
  O  O35  1  0.750  0.649  0.454  1.0
  O  O36  1  0.250  0.896  0.160  1.0
  O  O37  1  0.750  0.104  0.840  1.0
  O  O38  1  0.028  0.945  0.377  1.0
  O  O39  1  0.972  0.055  0.623  1.0
  O  O40  1  0.528  0.055  0.623  1.0
  O  O41  1  0.472  0.945  0.377  1.0
[/CIF]
.