The structure described by CrAl9(BO9)2 crystallizes in the triclinic P1 space group. Cr(1) is bonded to one O(10), one O(13), one O(18), one O(2), one O(5), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(3)O5 trigonal bipyramid, edges with two equivalent Al(9)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. There are nine inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(7), and one O(9) atom. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(4), one O(6), and one O(8) atom. In the third Al site, Al(3) is bonded to one O(14), one O(15), one O(16), one O(3), and one O(5) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(5)O4 tetrahedra,  an edgeedge with one Al(7)O6 octahedra,  an edgeedge with one Al(8)O6 octahedra, and  an edgeedge with one Al(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-50°. In the fourth Al site, Al(4) is bonded to one O(13), one O(17), one O(18), one O(4), and one O(6) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(6)O4 tetrahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Al(9)O6 octahedra, and  an edgeedge with one Al(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-48°. In the fifth Al site, Al(5) is bonded to one O(13), one O(15), one O(16), and one O(4) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(3)O5 trigonal bipyramids, and  an edgeedge with one Al(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-57°. In the sixth Al site, Al(6) is bonded to one O(14), one O(17), one O(18), and one O(3) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(4)O5 trigonal bipyramids, and  an edgeedge with one Al(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-58°. In the seventh Al site, Al(7) is bonded to one O(1), one O(11), one O(14), one O(15), one O(6), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(8)O6 octahedra, and  an edgeedge with one Al(3)O5 trigonal bipyramid. In the eighth Al site, Al(8) is bonded to one O(1), one O(12), one O(14), one O(16), one O(6), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(7)O6 octahedra, and  an edgeedge with one Al(3)O5 trigonal bipyramid. In the ninth Al site, Al(9) is bonded to one O(13), one O(17), one O(2), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(3)O5 trigonal bipyramid, edges with two equivalent Cr(1)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(10), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(11), one O(12), and one O(2) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(7), one Al(8), and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(9), and one B(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Al(1), one Al(3), and one Al(6) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Al(2), one Al(4), and one Al(5) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Al(1), one Al(3), and one Al(9) atom. In the sixth O site, O(6) is bonded to one Al(2), one Al(4), one Al(7), and one Al(8) atom to form OAl4 trigonal pyramids that share  a cornercorner with one O(13)Al3Cr trigonal pyramid and corners with two equivalent O(14)Al4 trigonal pyramids. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Al(1), one Al(7), and one Al(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(2), and one Al(9) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(9), and one B(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(1), and one B(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(7), and one B(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Al(2), one Al(8), and one B(2) atom. In the thirteenth O site, O(13) is bonded to one Cr(1), one Al(4), one Al(5), and one Al(9) atom to form corner-sharing OAl3Cr trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Al(3), one Al(6), one Al(7), and one Al(8) atom to form corner-sharing OAl4 trigonal pyramids. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Al(3), one Al(5), and one Al(7) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Al(3), one Al(5), and one Al(8) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Al(4), one Al(6), and one Al(9) atom. In the eighteenth O site, O(18) is bonded in a trigonal planar geometry to one Cr(1), one Al(4), and one Al(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al9Cr(BO9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.780
_cell_length_b   7.777
_cell_length_c   8.161
_cell_angle_alpha   90.099
_cell_angle_beta   110.622
_cell_angle_gamma   90.179
_symmetry_Int_Tables_number   1
_cell_volume   343.296
_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  0.553  0.819  0.114  1.0
  Al  Al1  1  0.440  0.314  0.883  1.0
  Al  Al2  1  0.745  0.814  0.492  1.0
  Al  Al3  1  0.259  0.312  0.511  1.0
  Al  Al4  1  0.298  0.664  0.595  1.0
  Al  Al5  1  0.704  0.163  0.410  1.0
  Al  Al6  1  0.632  0.998  0.769  1.0
  Al  Al7  1  0.136  0.998  0.767  1.0
  Al  Al8  1  0.368  0.497  0.232  1.0
  Cr  Cr9  1  0.864  0.500  0.231  1.0
  B  B10  1  0.017  0.783  0.033  1.0
  B  B11  1  0.984  0.278  0.963  1.0
  O  O12  1  0.955  0.907  0.906  1.0
  O  O13  1  0.055  0.402  0.089  1.0
  O  O14  1  0.649  0.961  0.299  1.0
  O  O15  1  0.351  0.460  0.702  1.0
  O  O16  1  0.660  0.631  0.341  1.0
  O  O17  1  0.334  0.129  0.662  1.0
  O  O18  1  0.454  0.928  0.910  1.0
  O  O19  1  0.529  0.426  0.085  1.0
  O  O20  1  0.256  0.719  0.100  1.0
  O  O21  1  0.837  0.724  0.098  1.0
  O  O22  1  0.741  0.217  0.900  1.0
  O  O23  1  0.156  0.213  0.895  1.0
  O  O24  1  0.205  0.560  0.387  1.0
  O  O25  1  0.809  0.058  0.618  1.0
  O  O26  1  0.553  0.798  0.622  1.0
  O  O27  1  0.067  0.797  0.618  1.0
  O  O28  1  0.450  0.295  0.381  1.0
  O  O29  1  0.939  0.290  0.387  1.0
[/CIF]
.
The structure described by CrAl9(BO9)2 crystallizes in the triclinic P1 space group. Cr(1) is bonded to one O(10), one O(13), one O(18), one O(2), one O(5), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(3)O5 trigonal bipyramid, edges with two equivalent Al(9)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. There are nine inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one O(10), one O(3), one O(5), one O(7), and one O(9) atom. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(4), one O(6), and one O(8) atom. In the third Al site, Al(3) is bonded to one O(14), one O(15), one O(16), one O(3), and one O(5) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(5)O4 tetrahedra,  an edgeedge with one Al(7)O6 octahedra,  an edgeedge with one Al(8)O6 octahedra, and  an edgeedge with one Al(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-50°. In the fourth Al site, Al(4) is bonded to one O(13), one O(17), one O(18), one O(4), and one O(6) atom to form distorted AlO5 trigonal bipyramids that share  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra, corners with two equivalent Al(6)O4 tetrahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Al(9)O6 octahedra, and  an edgeedge with one Al(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-48°. In the fifth Al site, Al(5) is bonded to one O(13), one O(15), one O(16), and one O(4) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(3)O5 trigonal bipyramids, and  an edgeedge with one Al(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 46-57°. In the sixth Al site, Al(6) is bonded to one O(14), one O(17), one O(18), and one O(3) atom to form AlO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Al(7)O6 octahedra,  a cornercorner with one Al(8)O6 octahedra,  a cornercorner with one Al(9)O6 octahedra, corners with two equivalent Al(4)O5 trigonal bipyramids, and  an edgeedge with one Al(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-58°. In the seventh Al site, Al(7) is bonded to one O(1), one O(11), one O(14), one O(15), one O(6), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(8)O6 octahedra, and  an edgeedge with one Al(3)O5 trigonal bipyramid. In the eighth Al site, Al(8) is bonded to one O(1), one O(12), one O(14), one O(16), one O(6), and one O(7) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(4)O5 trigonal bipyramid, edges with two equivalent Al(7)O6 octahedra, and  an edgeedge with one Al(3)O5 trigonal bipyramid. In the ninth Al site, Al(9) is bonded to one O(13), one O(17), one O(2), one O(5), one O(8), and one O(9) atom to form AlO6 octahedra that share  a cornercorner with one Al(5)O4 tetrahedra,  a cornercorner with one Al(6)O4 tetrahedra,  a cornercorner with one Al(3)O5 trigonal bipyramid, edges with two equivalent Cr(1)O6 octahedra, and  an edgeedge with one Al(4)O5 trigonal bipyramid. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(10), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(11), one O(12), and one O(2) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Al(7), one Al(8), and one B(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(9), and one B(2) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one Al(1), one Al(3), and one Al(6) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Al(2), one Al(4), and one Al(5) atom. In the fifth O site, O(5) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Al(1), one Al(3), and one Al(9) atom. In the sixth O site, O(6) is bonded to one Al(2), one Al(4), one Al(7), and one Al(8) atom to form OAl4 trigonal pyramids that share  a cornercorner with one O(13)Al3Cr trigonal pyramid and corners with two equivalent O(14)Al4 trigonal pyramids. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Al(1), one Al(7), and one Al(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(2), and one Al(9) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(9), and one B(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Cr(1), one Al(1), and one B(1) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Al(2), one Al(7), and one B(2) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one Al(2), one Al(8), and one B(2) atom. In the thirteenth O site, O(13) is bonded to one Cr(1), one Al(4), one Al(5), and one Al(9) atom to form corner-sharing OAl3Cr trigonal pyramids. In the fourteenth O site, O(14) is bonded to one Al(3), one Al(6), one Al(7), and one Al(8) atom to form corner-sharing OAl4 trigonal pyramids. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Al(3), one Al(5), and one Al(7) atom. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Al(3), one Al(5), and one Al(8) atom. In the seventeenth O site, O(17) is bonded in a trigonal planar geometry to one Al(4), one Al(6), and one Al(9) atom. In the eighteenth O site, O(18) is bonded in a trigonal planar geometry to one Cr(1), one Al(4), and one Al(6) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Al9Cr(BO9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.780
_cell_length_b   7.777
_cell_length_c   8.161
_cell_angle_alpha   90.099
_cell_angle_beta   110.622
_cell_angle_gamma   90.179
_symmetry_Int_Tables_number   1
_cell_volume   343.296
_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  0.553  0.819  0.114  1.0
  Al  Al1  1  0.440  0.314  0.883  1.0
  Al  Al2  1  0.745  0.814  0.492  1.0
  Al  Al3  1  0.259  0.312  0.511  1.0
  Al  Al4  1  0.298  0.664  0.595  1.0
  Al  Al5  1  0.704  0.163  0.410  1.0
  Al  Al6  1  0.632  0.998  0.769  1.0
  Al  Al7  1  0.136  0.998  0.767  1.0
  Al  Al8  1  0.368  0.497  0.232  1.0
  Cr  Cr9  1  0.864  0.500  0.231  1.0
  B  B10  1  0.017  0.783  0.033  1.0
  B  B11  1  0.984  0.278  0.963  1.0
  O  O12  1  0.955  0.907  0.906  1.0
  O  O13  1  0.055  0.402  0.089  1.0
  O  O14  1  0.649  0.961  0.299  1.0
  O  O15  1  0.351  0.460  0.702  1.0
  O  O16  1  0.660  0.631  0.341  1.0
  O  O17  1  0.334  0.129  0.662  1.0
  O  O18  1  0.454  0.928  0.910  1.0
  O  O19  1  0.529  0.426  0.085  1.0
  O  O20  1  0.256  0.719  0.100  1.0
  O  O21  1  0.837  0.724  0.098  1.0
  O  O22  1  0.741  0.217  0.900  1.0
  O  O23  1  0.156  0.213  0.895  1.0
  O  O24  1  0.205  0.560  0.387  1.0
  O  O25  1  0.809  0.058  0.618  1.0
  O  O26  1  0.553  0.798  0.622  1.0
  O  O27  1  0.067  0.797  0.618  1.0
  O  O28  1  0.450  0.295  0.381  1.0
  O  O29  1  0.939  0.290  0.387  1.0
[/CIF]
.