The crystal structure described by Al2OC is Enargite-like structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent C(1) and two equivalent O(1) atoms to form corner-sharing AlC2O2 tetrahedra. In the second Al site, Al(2) is bonded to two equivalent C(1) and two equivalent O(1) atoms to form corner-sharing AlC2O2 tetrahedra. C(1) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form CAl4 tetrahedra that share corners with four equivalent C(1)Al4 tetrahedra and corners with eight equivalent O(1)Al4 tetrahedra. O(1) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form OAl4 tetrahedra that share corners with four equivalent O(1)Al4 tetrahedra and corners with eight equivalent C(1)Al4 tetrahedra. is represented by the CIF file [CIF]
data_Al2CO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.119
_cell_length_b   5.641
_cell_length_c   6.316
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   182.392
_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
  Al  Al0  1  0.104  0.419  0.882  1.0
  Al  Al1  1  0.598  0.078  0.866  1.0
  Al  Al2  1  0.104  0.919  0.618  1.0
  Al  Al3  1  0.598  0.578  0.634  1.0
  Al  Al4  1  0.098  0.422  0.366  1.0
  Al  Al5  1  0.604  0.081  0.382  1.0
  Al  Al6  1  0.098  0.922  0.134  1.0
  Al  Al7  1  0.604  0.581  0.118  1.0
  C  C8  1  0.483  0.400  0.876  1.0
  C  C9  1  0.483  0.900  0.624  1.0
  C  C10  1  0.983  0.100  0.376  1.0
  C  C11  1  0.983  0.600  0.124  1.0
  O  O12  1  0.981  0.079  0.876  1.0
  O  O13  1  0.981  0.579  0.624  1.0
  O  O14  1  0.481  0.421  0.376  1.0
  O  O15  1  0.481  0.921  0.124  1.0
[/CIF]
.
The crystal structure described by Al2OC is Enargite-like structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent C(1) and two equivalent O(1) atoms to form corner-sharing AlC2O2 tetrahedra. In the second Al site, Al(2) is bonded to two equivalent C(1) and two equivalent O(1) atoms to form corner-sharing AlC2O2 tetrahedra. C(1) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form CAl4 tetrahedra that share corners with four equivalent C(1)Al4 tetrahedra and corners with eight equivalent O(1)Al4 tetrahedra. O(1) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form OAl4 tetrahedra that share corners with four equivalent O(1)Al4 tetrahedra and corners with eight equivalent C(1)Al4 tetrahedra. is represented by the CIF file [CIF]
data_Al2CO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.119
_cell_length_b   5.641
_cell_length_c   6.316
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   182.392
_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
  Al  Al0  1  0.104  0.419  0.882  1.0
  Al  Al1  1  0.598  0.078  0.866  1.0
  Al  Al2  1  0.104  0.919  0.618  1.0
  Al  Al3  1  0.598  0.578  0.634  1.0
  Al  Al4  1  0.098  0.422  0.366  1.0
  Al  Al5  1  0.604  0.081  0.382  1.0
  Al  Al6  1  0.098  0.922  0.134  1.0
  Al  Al7  1  0.604  0.581  0.118  1.0
  C  C8  1  0.483  0.400  0.876  1.0
  C  C9  1  0.483  0.900  0.624  1.0
  C  C10  1  0.983  0.100  0.376  1.0
  C  C11  1  0.983  0.600  0.124  1.0
  O  O12  1  0.981  0.079  0.876  1.0
  O  O13  1  0.981  0.579  0.624  1.0
  O  O14  1  0.481  0.421  0.376  1.0
  O  O15  1  0.481  0.921  0.124  1.0
[/CIF]
.