#------------------------------------------------------------------------------
#$Date: 2009-11-20 13:07:27 +0200 (Fri, 20 Nov 2009) $
#$Revision: 893 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001580.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_9001580
loop_
_publ_author_name
'Downs R T'
'Palmer D C'
_publ_section_title
;
 The pressure behavior of alpha cristobalite
 P = 0.73 GPa
;
_journal_name_full               'American Mineralogist'
_journal_page_first              9
_journal_page_last               14
_journal_volume                  79
_journal_year                    1994
_chemical_formula_sum            'O2 Si'
_chemical_name_mineral           Cristobalite
_symmetry_space_group_name_H-M   'P 41 21 2'
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_length_a                   4.9028
_cell_length_b                   4.9028
_cell_length_c                   6.7782
_cell_volume                     162.931
_diffrn_ambient_pressure         7.3e+05
_[local]_cod_chemical_formula_sum_orig 'Si O2'
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
y,x,-z
1/2-y,1/2+x,1/4+z
1/2-x,1/2+y,1/4-z
-x,-y,1/2+z
-y,-x,1/2-z
1/2+y,1/2-x,3/4+z
1/2+x,1/2-y,3/4-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Si 0.30860 0.30860 0.00000 0.00798
O 0.23640 0.11980 0.18700 0.01355