The crystal structure described by RbCuAl(PO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 12-coordinate geometry to one O(2), one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. Cu(1) is bonded in a 6-coordinate geometry to one O(3), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Al(1) is bonded to one O(1), one O(2), one O(4), one O(6), and one O(8) atom to form AlO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Al(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the second O site, O(5) is bonded in a distorted water-like geometry to one Rb(1), two equivalent Cu(1), and one P(2) atom. In the third O site, O(6) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(1), one Al(1), and one P(2) atom. In the fourth O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent Cu(1), and one P(1) atom. In the fifth O site, O(8) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the sixth O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Al(1), and one P(2) atom. In the eighth O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Cu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_RbAlCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.217
_cell_length_b   5.129
_cell_length_c   9.464
_cell_angle_alpha   79.792
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.273
_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
  Rb  Rb0  1  0.174  0.787  0.787  1.0
  Rb  Rb1  1  0.674  0.213  0.713  1.0
  Rb  Rb2  1  0.826  0.213  0.213  1.0
  Rb  Rb3  1  0.326  0.787  0.287  1.0
  Al  Al4  1  0.370  0.246  0.611  1.0
  Al  Al5  1  0.870  0.754  0.889  1.0
  Al  Al6  1  0.630  0.754  0.389  1.0
  Al  Al7  1  0.130  0.246  0.111  1.0
  Cu  Cu8  1  0.458  0.760  0.950  1.0
  Cu  Cu9  1  0.958  0.240  0.550  1.0
  Cu  Cu10  1  0.542  0.240  0.050  1.0
  Cu  Cu11  1  0.042  0.760  0.450  1.0
  P  P12  1  0.328  0.273  0.951  1.0
  P  P13  1  0.828  0.727  0.549  1.0
  P  P14  1  0.672  0.727  0.049  1.0
  P  P15  1  0.172  0.273  0.451  1.0
  P  P16  1  0.488  0.721  0.664  1.0
  P  P17  1  0.988  0.279  0.836  1.0
  P  P18  1  0.512  0.279  0.336  1.0
  P  P19  1  0.012  0.721  0.164  1.0
  O  O20  1  0.422  0.230  0.425  1.0
  O  O21  1  0.922  0.770  0.075  1.0
  O  O22  1  0.578  0.770  0.575  1.0
  O  O23  1  0.078  0.230  0.925  1.0
  O  O24  1  0.409  0.587  0.588  1.0
  O  O25  1  0.909  0.413  0.912  1.0
  O  O26  1  0.591  0.413  0.412  1.0
  O  O27  1  0.091  0.587  0.088  1.0
  O  O28  1  0.340  0.565  0.970  1.0
  O  O29  1  0.840  0.435  0.530  1.0
  O  O30  1  0.660  0.435  0.030  1.0
  O  O31  1  0.160  0.565  0.470  1.0
  O  O32  1  0.311  0.251  0.792  1.0
  O  O33  1  0.811  0.749  0.708  1.0
  O  O34  1  0.689  0.749  0.208  1.0
  O  O35  1  0.189  0.251  0.292  1.0
  O  O36  1  0.510  0.549  0.813  1.0
  O  O37  1  0.010  0.451  0.687  1.0
  O  O38  1  0.490  0.451  0.187  1.0
  O  O39  1  0.990  0.549  0.313  1.0
  O  O40  1  0.449  0.989  0.696  1.0
  O  O41  1  0.949  0.011  0.804  1.0
  O  O42  1  0.551  0.011  0.304  1.0
  O  O43  1  0.051  0.989  0.196  1.0
  O  O44  1  0.414  0.095  0.015  1.0
  O  O45  1  0.914  0.905  0.485  1.0
  O  O46  1  0.586  0.905  0.985  1.0
  O  O47  1  0.086  0.095  0.515  1.0
  O  O48  1  0.258  0.158  0.541  1.0
  O  O49  1  0.758  0.842  0.959  1.0
  O  O50  1  0.742  0.842  0.459  1.0
  O  O51  1  0.242  0.158  0.041  1.0
[/CIF]
.
The crystal structure described by RbCuAl(PO4)2 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 12-coordinate geometry to one O(2), one O(5), one O(6), one O(7), two equivalent O(1), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. Cu(1) is bonded in a 6-coordinate geometry to one O(3), one O(6), two equivalent O(5), and two equivalent O(7) atoms. Al(1) is bonded to one O(1), one O(2), one O(4), one O(6), and one O(8) atom to form AlO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Al(1)O5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the second O site, O(5) is bonded in a distorted water-like geometry to one Rb(1), two equivalent Cu(1), and one P(2) atom. In the third O site, O(6) is bonded in a 2-coordinate geometry to one Rb(1), one Cu(1), one Al(1), and one P(2) atom. In the fourth O site, O(7) is bonded in a 3-coordinate geometry to one Rb(1), two equivalent Cu(1), and one P(1) atom. In the fifth O site, O(8) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(1) atom. In the sixth O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(1), one Al(1), and one P(2) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Al(1), and one P(2) atom. In the eighth O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(1), one Cu(1), and one P(1) atom. is represented by the CIF file [CIF]
data_RbAlCu(PO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   14.217
_cell_length_b   5.129
_cell_length_c   9.464
_cell_angle_alpha   79.792
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   679.273
_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
  Rb  Rb0  1  0.174  0.787  0.787  1.0
  Rb  Rb1  1  0.674  0.213  0.713  1.0
  Rb  Rb2  1  0.826  0.213  0.213  1.0
  Rb  Rb3  1  0.326  0.787  0.287  1.0
  Al  Al4  1  0.370  0.246  0.611  1.0
  Al  Al5  1  0.870  0.754  0.889  1.0
  Al  Al6  1  0.630  0.754  0.389  1.0
  Al  Al7  1  0.130  0.246  0.111  1.0
  Cu  Cu8  1  0.458  0.760  0.950  1.0
  Cu  Cu9  1  0.958  0.240  0.550  1.0
  Cu  Cu10  1  0.542  0.240  0.050  1.0
  Cu  Cu11  1  0.042  0.760  0.450  1.0
  P  P12  1  0.328  0.273  0.951  1.0
  P  P13  1  0.828  0.727  0.549  1.0
  P  P14  1  0.672  0.727  0.049  1.0
  P  P15  1  0.172  0.273  0.451  1.0
  P  P16  1  0.488  0.721  0.664  1.0
  P  P17  1  0.988  0.279  0.836  1.0
  P  P18  1  0.512  0.279  0.336  1.0
  P  P19  1  0.012  0.721  0.164  1.0
  O  O20  1  0.422  0.230  0.425  1.0
  O  O21  1  0.922  0.770  0.075  1.0
  O  O22  1  0.578  0.770  0.575  1.0
  O  O23  1  0.078  0.230  0.925  1.0
  O  O24  1  0.409  0.587  0.588  1.0
  O  O25  1  0.909  0.413  0.912  1.0
  O  O26  1  0.591  0.413  0.412  1.0
  O  O27  1  0.091  0.587  0.088  1.0
  O  O28  1  0.340  0.565  0.970  1.0
  O  O29  1  0.840  0.435  0.530  1.0
  O  O30  1  0.660  0.435  0.030  1.0
  O  O31  1  0.160  0.565  0.470  1.0
  O  O32  1  0.311  0.251  0.792  1.0
  O  O33  1  0.811  0.749  0.708  1.0
  O  O34  1  0.689  0.749  0.208  1.0
  O  O35  1  0.189  0.251  0.292  1.0
  O  O36  1  0.510  0.549  0.813  1.0
  O  O37  1  0.010  0.451  0.687  1.0
  O  O38  1  0.490  0.451  0.187  1.0
  O  O39  1  0.990  0.549  0.313  1.0
  O  O40  1  0.449  0.989  0.696  1.0
  O  O41  1  0.949  0.011  0.804  1.0
  O  O42  1  0.551  0.011  0.304  1.0
  O  O43  1  0.051  0.989  0.196  1.0
  O  O44  1  0.414  0.095  0.015  1.0
  O  O45  1  0.914  0.905  0.485  1.0
  O  O46  1  0.586  0.905  0.985  1.0
  O  O47  1  0.086  0.095  0.515  1.0
  O  O48  1  0.258  0.158  0.541  1.0
  O  O49  1  0.758  0.842  0.959  1.0
  O  O50  1  0.742  0.842  0.459  1.0
  O  O51  1  0.242  0.158  0.041  1.0
[/CIF]
.