The crystal structure described by Na3Cr(BO3)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(6), and two equivalent O(3) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share  a cornercorner with one Na(2)O5 trigonal bipyramid and edges with two equivalent Na(2)O5 trigonal bipyramids. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Cr(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Cr(1), and one B(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Na(3), one Cr(1), and one B(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Cr(1), and one B(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Na(1), one Na(2), one Cr(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Cr(1), and one B(2) atom. is represented by the CIF card [CIF]
data_Na3Cr(BO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.214
_cell_length_b   5.524
_cell_length_c   11.419
_cell_angle_alpha   65.506
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   528.873
_cell_formula_units_Z   4
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
  Na  Na0  1  0.939  0.507  0.364  1.0
  Na  Na1  1  0.631  0.446  0.375  1.0
  Na  Na2  1  0.956  0.943  0.877  1.0
  Na  Na3  1  0.131  0.554  0.125  1.0
  Na  Na4  1  0.456  0.057  0.623  1.0
  Na  Na5  1  0.439  0.493  0.136  1.0
  Na  Na6  1  0.561  0.507  0.864  1.0
  Na  Na7  1  0.544  0.943  0.377  1.0
  Na  Na8  1  0.869  0.446  0.875  1.0
  Na  Na9  1  0.044  0.057  0.123  1.0
  Na  Na10  1  0.369  0.554  0.625  1.0
  Na  Na11  1  0.061  0.493  0.636  1.0
  Cr  Cr12  1  0.285  0.028  0.877  1.0
  Cr  Cr13  1  0.785  0.972  0.623  1.0
  Cr  Cr14  1  0.215  0.028  0.377  1.0
  Cr  Cr15  1  0.715  0.972  0.123  1.0
  B  B16  1  0.297  0.457  0.383  1.0
  B  B17  1  0.635  0.970  0.864  1.0
  B  B18  1  0.797  0.543  0.117  1.0
  B  B19  1  0.135  0.030  0.636  1.0
  B  B20  1  0.865  0.970  0.364  1.0
  B  B21  1  0.203  0.457  0.883  1.0
  B  B22  1  0.365  0.030  0.136  1.0
  B  B23  1  0.703  0.543  0.617  1.0
  O  O24  1  0.312  0.884  0.071  1.0
  O  O25  1  0.671  0.323  0.594  1.0
  O  O26  1  0.899  0.742  0.104  1.0
  O  O27  1  0.236  0.156  0.685  1.0
  O  O28  1  0.662  0.598  0.153  1.0
  O  O29  1  0.162  0.402  0.347  1.0
  O  O30  1  0.990  0.070  0.653  1.0
  O  O31  1  0.490  0.930  0.847  1.0
  O  O32  1  0.736  0.844  0.815  1.0
  O  O33  1  0.399  0.258  0.396  1.0
  O  O34  1  0.812  0.116  0.429  1.0
  O  O35  1  0.171  0.677  0.906  1.0
  O  O36  1  0.829  0.323  0.094  1.0
  O  O37  1  0.188  0.884  0.571  1.0
  O  O38  1  0.601  0.742  0.604  1.0
  O  O39  1  0.264  0.156  0.185  1.0
  O  O40  1  0.510  0.070  0.153  1.0
  O  O41  1  0.010  0.930  0.347  1.0
  O  O42  1  0.838  0.598  0.653  1.0
  O  O43  1  0.338  0.402  0.847  1.0
  O  O44  1  0.764  0.844  0.315  1.0
  O  O45  1  0.101  0.258  0.896  1.0
  O  O46  1  0.329  0.677  0.406  1.0
  O  O47  1  0.688  0.116  0.929  1.0
[/CIF]
.
The crystal structure described by Na3Cr(BO3)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. In the second Na site, Na(2) is bonded to one O(1), one O(2), one O(3), one O(4), and one O(5) atom to form distorted NaO5 trigonal bipyramids that share  a cornercorner with one Cr(1)O6 octahedra and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 18°. In the third Na site, Na(3) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(6), and two equivalent O(3) atoms. Cr(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share  a cornercorner with one Na(2)O5 trigonal bipyramid and edges with two equivalent Na(2)O5 trigonal bipyramids. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(5) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(4), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Cr(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Na(3), one Cr(1), and one B(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Na(3), one Cr(1), and one B(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Cr(1), and one B(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal pyramidal geometry to one Na(1), one Na(2), one Cr(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Cr(1), and one B(2) atom. is represented by the CIF card [CIF]
data_Na3Cr(BO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.214
_cell_length_b   5.524
_cell_length_c   11.419
_cell_angle_alpha   65.506
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   528.873
_cell_formula_units_Z   4
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
  Na  Na0  1  0.939  0.507  0.364  1.0
  Na  Na1  1  0.631  0.446  0.375  1.0
  Na  Na2  1  0.956  0.943  0.877  1.0
  Na  Na3  1  0.131  0.554  0.125  1.0
  Na  Na4  1  0.456  0.057  0.623  1.0
  Na  Na5  1  0.439  0.493  0.136  1.0
  Na  Na6  1  0.561  0.507  0.864  1.0
  Na  Na7  1  0.544  0.943  0.377  1.0
  Na  Na8  1  0.869  0.446  0.875  1.0
  Na  Na9  1  0.044  0.057  0.123  1.0
  Na  Na10  1  0.369  0.554  0.625  1.0
  Na  Na11  1  0.061  0.493  0.636  1.0
  Cr  Cr12  1  0.285  0.028  0.877  1.0
  Cr  Cr13  1  0.785  0.972  0.623  1.0
  Cr  Cr14  1  0.215  0.028  0.377  1.0
  Cr  Cr15  1  0.715  0.972  0.123  1.0
  B  B16  1  0.297  0.457  0.383  1.0
  B  B17  1  0.635  0.970  0.864  1.0
  B  B18  1  0.797  0.543  0.117  1.0
  B  B19  1  0.135  0.030  0.636  1.0
  B  B20  1  0.865  0.970  0.364  1.0
  B  B21  1  0.203  0.457  0.883  1.0
  B  B22  1  0.365  0.030  0.136  1.0
  B  B23  1  0.703  0.543  0.617  1.0
  O  O24  1  0.312  0.884  0.071  1.0
  O  O25  1  0.671  0.323  0.594  1.0
  O  O26  1  0.899  0.742  0.104  1.0
  O  O27  1  0.236  0.156  0.685  1.0
  O  O28  1  0.662  0.598  0.153  1.0
  O  O29  1  0.162  0.402  0.347  1.0
  O  O30  1  0.990  0.070  0.653  1.0
  O  O31  1  0.490  0.930  0.847  1.0
  O  O32  1  0.736  0.844  0.815  1.0
  O  O33  1  0.399  0.258  0.396  1.0
  O  O34  1  0.812  0.116  0.429  1.0
  O  O35  1  0.171  0.677  0.906  1.0
  O  O36  1  0.829  0.323  0.094  1.0
  O  O37  1  0.188  0.884  0.571  1.0
  O  O38  1  0.601  0.742  0.604  1.0
  O  O39  1  0.264  0.156  0.185  1.0
  O  O40  1  0.510  0.070  0.153  1.0
  O  O41  1  0.010  0.930  0.347  1.0
  O  O42  1  0.838  0.598  0.653  1.0
  O  O43  1  0.338  0.402  0.847  1.0
  O  O44  1  0.764  0.844  0.315  1.0
  O  O45  1  0.101  0.258  0.896  1.0
  O  O46  1  0.329  0.677  0.406  1.0
  O  O47  1  0.688  0.116  0.929  1.0
[/CIF]
.