data_Al2O3_alpha_corundum
_chemical_name_systematic          'Aluminium Oxide'
_chemical_formula_structural       'Al2 O3'
_chemical_formula_sum              'Al2 O3'
_chemical_name_mineral             Corundum
_cell_length_a                     4.7607(9)
_cell_length_b                     4.7607(9)
_cell_length_c                     12.9947(17)
_cell_angle_alpha                  90.
_cell_angle_beta                   90.
_cell_angle_gamma                  120.
_cell_volume                       255.06
_cell_formula_units_Z              6
_symmetry_space_group_name_H-M     'R -3 c H'
_symmetry_Int_Tables_number        167
loop_
_symmetry_equiv_pos_site_id
_symmetry_equiv_pos_as_xyz
  1	'x-y, -y, -z+1/2'
  2	'-x, -x+y, -z+1/2'
  3	'y, x, -z+1/2'
  4	'x-y, x, -z'
  5	'y, -x+y, -z'
  6	'-x, -y, -z'
  7	'-x+y, y, z+1/2'
  8	'x, x-y, z+1/2'
  9	'-y, -x, z+1/2'
 10	'-x+y, -x, z'
 11	'-y, x-y, z'
 12	'x, y, z'
 13	'x-y+2/3, -y+1/3, -z+5/6'
 14	'x-y+1/3, -y+2/3, -z+1/6'
 15	'-x+2/3, -x+y+1/3, -z+5/6'
 16	'-x+1/3, -x+y+2/3, -z+1/6'
 17	'y+2/3, x+1/3, -z+5/6'
 18	'y+1/3, x+2/3, -z+1/6'
 19	'x-y+2/3, x+1/3, -z+1/3'
 20	'x-y+1/3, x+2/3, -z+2/3'
 21	'y+2/3, -x+y+1/3, -z+1/3'
 22	'y+1/3, -x+y+2/3, -z+2/3'
 23	'-x+2/3, -y+1/3, -z+1/3'
 24	'-x+1/3, -y+2/3, -z+2/3'
 25	'-x+y+2/3, y+1/3, z+5/6'
 26	'-x+y+1/3, y+2/3, z+1/6'
 27	'x+2/3, x-y+1/3, z+5/6'
 28	'x+1/3, x-y+2/3, z+1/6'
 29	'-y+2/3, -x+1/3, z+5/6'
 30	'-y+1/3, -x+2/3, z+1/6'
 31	'-x+y+2/3, -x+1/3, z+1/3'
 32	'-x+y+1/3, -x+2/3, z+2/3'
 33	'-y+2/3, x-y+1/3, z+1/3'
 34	'-y+1/3, x-y+2/3, z+2/3'
 35	'x+2/3, y+1/3, z+1/3'
 36	'x+1/3, y+2/3, z+2/3'
loop_
_atom_type_symbol
_atom_type_oxidation_number
Al3+	3
O2-	-2
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_B_iso_or_equiv
Al1 Al3+ 12 c 0 0 0.35216(8) 1. 0 0.31(4) 
O1 O2- 18 e 0.3061(5) 0 0.25 1. 0 0.33(5) 


