data_SiO2_quartz_alpha_Lt
_chemical_name_systematic          'Silicon Oxide - Alpha'
_chemical_formula_structural       'Si O2'
_chemical_formula_sum              'O2 Si1'
_chemical_name_mineral             'Quartz low'
_cell_length_a                     4.965(2)
_cell_length_b                     4.965(2)
_cell_length_c                     5.424(2)
_cell_angle_alpha                  90.
_cell_angle_beta                   90.
_cell_angle_gamma                  120.
_cell_volume                       115.79
_cell_formula_units_Z              3
_symmetry_space_group_name_H-M     'P 31 2 1'
_symmetry_Int_Tables_number        152
loop_
_symmetry_equiv_pos_site_id
_symmetry_equiv_pos_as_xyz
  1	'x-y, -y, -z+2/3'
  2	'-x, -x+y, -z+1/3'
  3	'y, x, -z'
  4	'-x+y, -x, z+2/3'
  5	'-y, x-y, z+1/3'
  6	'x, y, z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
O2-	-2
Si4+	4
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
Si1 Si4+ 3 a 0.5248(4) 0 0.3333 1. 0 
O1 O2- 6 c 0.157(1) 0.416(1) -.1232(7) 1. 0 


