The structure described by MgAl(PO4)O crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO5 trigonal bipyramids that share corners with two equivalent Al(1)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. Al(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent Mg(1)O5 trigonal bipyramids. P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with four equivalent Mg(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one P(1) atom. is represented by the CIF file [CIF]
data_MgAlPO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.249
_cell_length_b   7.102
_cell_length_c   10.292
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.339
_symmetry_Int_Tables_number   1
_cell_volume   383.653
_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
  Mg  Mg0  1  0.908  0.980  0.857  1.0
  Mg  Mg1  1  0.092  0.020  0.143  1.0
  Mg  Mg2  1  0.408  0.980  0.643  1.0
  Mg  Mg3  1  0.592  0.020  0.357  1.0
  Al  Al4  1  0.324  0.640  0.830  1.0
  Al  Al5  1  0.824  0.640  0.670  1.0
  Al  Al6  1  0.176  0.360  0.330  1.0
  Al  Al7  1  0.676  0.360  0.170  1.0
  P  P8  1  0.587  0.779  0.094  1.0
  P  P9  1  0.413  0.221  0.906  1.0
  P  P10  1  0.087  0.779  0.406  1.0
  P  P11  1  0.913  0.221  0.594  1.0
  O  O12  1  0.028  0.729  0.790  1.0
  O  O13  1  0.528  0.729  0.710  1.0
  O  O14  1  0.180  0.116  0.960  1.0
  O  O15  1  0.171  0.604  0.333  1.0
  O  O16  1  0.409  0.722  0.983  1.0
  O  O17  1  0.440  0.910  0.185  1.0
  O  O18  1  0.680  0.116  0.540  1.0
  O  O19  1  0.472  0.271  0.290  1.0
  O  O20  1  0.972  0.271  0.210  1.0
  O  O21  1  0.320  0.884  0.460  1.0
  O  O22  1  0.060  0.090  0.685  1.0
  O  O23  1  0.329  0.396  0.833  1.0
  O  O24  1  0.940  0.910  0.315  1.0
  O  O25  1  0.909  0.722  0.517  1.0
  O  O26  1  0.820  0.884  0.040  1.0
  O  O27  1  0.591  0.278  0.017  1.0
  O  O28  1  0.091  0.278  0.483  1.0
  O  O29  1  0.671  0.604  0.167  1.0
  O  O30  1  0.829  0.396  0.667  1.0
  O  O31  1  0.560  0.090  0.815  1.0
[/CIF]
.
The structure described by MgAl(PO4)O crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(5) atoms to form MgO5 trigonal bipyramids that share corners with two equivalent Al(1)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, corners with two equivalent Mg(1)O5 trigonal bipyramids, and  an edgeedge with one Mg(1)O5 trigonal bipyramid. Al(1) is bonded to one O(3), one O(4), and two equivalent O(1) atoms to form AlO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent Mg(1)O5 trigonal bipyramids. P(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with four equivalent Mg(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Al(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mg(1) and one P(1) atom. is represented by the CIF file [CIF]
data_MgAlPO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.249
_cell_length_b   7.102
_cell_length_c   10.292
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.339
_symmetry_Int_Tables_number   1
_cell_volume   383.653
_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
  Mg  Mg0  1  0.908  0.980  0.857  1.0
  Mg  Mg1  1  0.092  0.020  0.143  1.0
  Mg  Mg2  1  0.408  0.980  0.643  1.0
  Mg  Mg3  1  0.592  0.020  0.357  1.0
  Al  Al4  1  0.324  0.640  0.830  1.0
  Al  Al5  1  0.824  0.640  0.670  1.0
  Al  Al6  1  0.176  0.360  0.330  1.0
  Al  Al7  1  0.676  0.360  0.170  1.0
  P  P8  1  0.587  0.779  0.094  1.0
  P  P9  1  0.413  0.221  0.906  1.0
  P  P10  1  0.087  0.779  0.406  1.0
  P  P11  1  0.913  0.221  0.594  1.0
  O  O12  1  0.028  0.729  0.790  1.0
  O  O13  1  0.528  0.729  0.710  1.0
  O  O14  1  0.180  0.116  0.960  1.0
  O  O15  1  0.171  0.604  0.333  1.0
  O  O16  1  0.409  0.722  0.983  1.0
  O  O17  1  0.440  0.910  0.185  1.0
  O  O18  1  0.680  0.116  0.540  1.0
  O  O19  1  0.472  0.271  0.290  1.0
  O  O20  1  0.972  0.271  0.210  1.0
  O  O21  1  0.320  0.884  0.460  1.0
  O  O22  1  0.060  0.090  0.685  1.0
  O  O23  1  0.329  0.396  0.833  1.0
  O  O24  1  0.940  0.910  0.315  1.0
  O  O25  1  0.909  0.722  0.517  1.0
  O  O26  1  0.820  0.884  0.040  1.0
  O  O27  1  0.591  0.278  0.017  1.0
  O  O28  1  0.091  0.278  0.483  1.0
  O  O29  1  0.671  0.604  0.167  1.0
  O  O30  1  0.829  0.396  0.667  1.0
  O  O31  1  0.560  0.090  0.815  1.0
[/CIF]
.