The crystal structure described by Cr3Al3(SbO8)2 is Hydrophilite-derived structured and crystallizes in the monoclinic Cm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with two equivalent Sb(2)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. In the second Cr site, Cr(2) is bonded to one O(10), one O(5), two equivalent O(1), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with four equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), two equivalent O(11), and two equivalent O(6) atoms to form AlO6 octahedra that share corners with two equivalent Sb(2)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the second Al site, Al(2) is bonded to one O(1), one O(10), one O(12), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with four equivalent Al(2)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. In the second Sb site, Sb(2) is bonded to one O(12), one O(7), two equivalent O(11), and two equivalent O(9) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Cr(1)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-53°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(2), one Al(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cr(1) and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Cr(1) and one Al(1) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to two equivalent Cr(1) and one Al(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Cr(2) and two equivalent Al(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Al(1), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Cr(1) and one Sb(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to two equivalent Al(2) and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Cr(2), one Al(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(2) and two equivalent Al(2) atoms. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(1), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to two equivalent Al(2) and one Sb(2) atom. is represented by the CIF card [CIF]
data_Al3Cr3(SbO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.781
_cell_length_b   5.781
_cell_length_c   9.296
_cell_angle_alpha   89.594
_cell_angle_beta   89.594
_cell_angle_gamma   60.415
_symmetry_Int_Tables_number   1
_cell_volume   270.194
_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
  Al  Al0  1  0.168  0.168  0.797  1.0
  Al  Al1  1  0.831  0.335  0.296  1.0
  Al  Al2  1  0.335  0.831  0.296  1.0
  Cr  Cr3  1  0.662  0.166  0.783  1.0
  Cr  Cr4  1  0.166  0.662  0.783  1.0
  Cr  Cr5  1  0.830  0.830  0.275  1.0
  Sb  Sb6  1  0.330  0.330  0.506  1.0
  Sb  Sb7  1  0.661  0.661  0.009  1.0
  O  O8  1  0.667  0.171  0.397  1.0
  O  O9  1  0.480  0.480  0.660  1.0
  O  O10  1  0.335  0.335  0.891  1.0
  O  O11  1  0.004  0.004  0.700  1.0
  O  O12  1  0.998  0.998  0.199  1.0
  O  O13  1  0.171  0.667  0.397  1.0
  O  O14  1  0.475  0.045  0.665  1.0
  O  O15  1  0.045  0.475  0.665  1.0
  O  O16  1  0.832  0.832  0.898  1.0
  O  O17  1  0.163  0.163  0.394  1.0
  O  O18  1  0.960  0.526  0.162  1.0
  O  O19  1  0.526  0.960  0.162  1.0
  O  O20  1  0.675  0.675  0.389  1.0
  O  O21  1  0.839  0.330  0.898  1.0
  O  O22  1  0.526  0.526  0.170  1.0
  O  O23  1  0.330  0.839  0.898  1.0
[/CIF]
.
The crystal structure described by Cr3Al3(SbO8)2 is Hydrophilite-derived structured and crystallizes in the monoclinic Cm space group. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form CrO6 octahedra that share corners with two equivalent Sb(2)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-53°. In the second Cr site, Cr(2) is bonded to one O(10), one O(5), two equivalent O(1), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, and edges with four equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles are 52°. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(3), one O(4), two equivalent O(11), and two equivalent O(6) atoms to form AlO6 octahedra that share corners with two equivalent Sb(2)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, and edges with four equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the second Al site, Al(2) is bonded to one O(1), one O(10), one O(12), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(2), one O(8), two equivalent O(1), and two equivalent O(6) atoms to form SbO6 octahedra that share corners with two equivalent Cr(2)O6 octahedra, corners with four equivalent Al(2)O6 octahedra,  an edgeedge with one Al(1)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. In the second Sb site, Sb(2) is bonded to one O(12), one O(7), two equivalent O(11), and two equivalent O(9) atoms to form SbO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Cr(1)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra, and edges with two equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 49-53°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(2), one Al(2), and one Sb(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cr(1) and one Sb(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to two equivalent Cr(1) and one Al(1) atom. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to two equivalent Cr(1) and one Al(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Cr(2) and two equivalent Al(2) atoms. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Cr(1), one Al(1), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Cr(1) and one Sb(2) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to two equivalent Al(2) and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Cr(2), one Al(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(2) and two equivalent Al(2) atoms. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(1), and one Sb(2) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to two equivalent Al(2) and one Sb(2) atom. is represented by the CIF card [CIF]
data_Al3Cr3(SbO8)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.781
_cell_length_b   5.781
_cell_length_c   9.296
_cell_angle_alpha   89.594
_cell_angle_beta   89.594
_cell_angle_gamma   60.415
_symmetry_Int_Tables_number   1
_cell_volume   270.194
_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
  Al  Al0  1  0.168  0.168  0.797  1.0
  Al  Al1  1  0.831  0.335  0.296  1.0
  Al  Al2  1  0.335  0.831  0.296  1.0
  Cr  Cr3  1  0.662  0.166  0.783  1.0
  Cr  Cr4  1  0.166  0.662  0.783  1.0
  Cr  Cr5  1  0.830  0.830  0.275  1.0
  Sb  Sb6  1  0.330  0.330  0.506  1.0
  Sb  Sb7  1  0.661  0.661  0.009  1.0
  O  O8  1  0.667  0.171  0.397  1.0
  O  O9  1  0.480  0.480  0.660  1.0
  O  O10  1  0.335  0.335  0.891  1.0
  O  O11  1  0.004  0.004  0.700  1.0
  O  O12  1  0.998  0.998  0.199  1.0
  O  O13  1  0.171  0.667  0.397  1.0
  O  O14  1  0.475  0.045  0.665  1.0
  O  O15  1  0.045  0.475  0.665  1.0
  O  O16  1  0.832  0.832  0.898  1.0
  O  O17  1  0.163  0.163  0.394  1.0
  O  O18  1  0.960  0.526  0.162  1.0
  O  O19  1  0.526  0.960  0.162  1.0
  O  O20  1  0.675  0.675  0.389  1.0
  O  O21  1  0.839  0.330  0.898  1.0
  O  O22  1  0.526  0.526  0.170  1.0
  O  O23  1  0.330  0.839  0.898  1.0
[/CIF]
.