data_1010921
_publ_section_title
;
The Cristobalite Structures. I. High-Cristobalite
;
_journal_coden_ASTM              AJSC5L
_journal_name_full
;
American Journal of Science, Serie 5(1,1921-1938)
;
_journal_page_first              350
_journal_page_last               356
_journal_volume                  23
_journal_year                    1932
_chemical_formula_structural     'Si O2'
_chemical_formula_sum            'O2 Si'
_chemical_name_mineral           'Cristobalite high'
_chemical_name_systematic        'Silicon oxide'
_space_group_IT_number           198
_symmetry_cell_setting           cubic
_symmetry_Int_Tables_number      198
_symmetry_space_group_name_Hall  'P 2ac 2ab 3'
_symmetry_space_group_name_H-M   'P 21 3'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   7.16
_cell_length_b                   7.16
_cell_length_c                   7.16
_cell_volume                     367.1
_cod_database_code               1010921
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
y,z,x
z,x,y
1/2+x,1/2-y,-z
1/2+y,1/2-z,-x
1/2+z,1/2-x,-y
-x,1/2+y,1/2-z
-y,1/2+z,1/2-x
-z,1/2+x,1/2-y
1/2-x,-y,1/2+z
1/2-y,-z,1/2+x
1/2-z,-x,1/2+y
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_calc_flag
Si1 Si4+ 4 a 0.255(8) 0.255(8) 0.255(8) 1. 0 d
Si2 Si4+ 4 a -0.008(8) -0.008(8) -0.008(8) 1. 0 d
O1 O2- 4 a 0.125(15) 0.125(15) 0.125(15) 1. 0 d
O2 O2- 12 b 0.660(15) 0.660(15) 0.062(15) 1. 0 d
loop_
_atom_type_symbol
_atom_type_oxidation_number
Si4+ 4.000
O2- -2.000
