#------------------------------------------------------------------------------
#$Date: 2010-01-30 15:59:17 +0200 (Sat, 30 Jan 2010) $
#$Revision: 966 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/1011176.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_1011176
_chemical_name_systematic          'Silicon oxide - $-alpha'
_chemical_name_mineral             'Quartz low'
_chemical_formula_structural       'Si O2'
_chemical_formula_sum              'O2 Si'
_publ_section_title
;
Die Kristallstruktur von Tiefquarz Si O2 und Aluminiumorthoarsenat Al
As O4
;
loop_
_publ_author_name                  'Machatschki, F'
_journal_name_full
;
Zeitschrift fuer Kristallographie, Kristallgeometrie, Kristallphysik,
Kristallchemie (-144,1977)
;
_journal_coden_ASTM                ZEKGAX
_journal_volume                    94
_journal_year                      1936
_journal_page_first                222
_journal_page_last                 230
_cell_length_a                     4.9
_cell_length_b                     4.9
_cell_length_c                     5.4
_cell_angle_alpha                  90
_cell_angle_beta                   90
_cell_angle_gamma                  120
_cell_volume                       112.3
_cell_formula_units_Z              3
_exptl_crystal_density_meas        2.66
_symmetry_space_group_name_H-M     'P 32 2 1 S'
_symmetry_Int_Tables_number        154
_symmetry_cell_setting             trigonal
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'y,x,2/3-z'
  '-y,x-y,2/3+z'
  '-x,y-x,1/3-z'
  'y-x,-x,1/3+z'
  'x-y,-y,-z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
  Si4+   4.000
  O2-   -2.000
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+   3 a 0.469(3) 0. 0. 1.  0 d
  O1    O2-    6 c 0.403(6) 0.253(6) 0.122(6) 1.  0 d
_cod_database_code 1011176