#------------------------------------------------------------------------------
#$Date: 2008-03-10 10:25:41 +0200 (Mon, 10 Mar 2008) $
#$Revision: 255 $
#$URL: file:///home/coder/svn-repositories/cod/cif/9/9001578.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_9001578
loop_
_publ_author_name
'Downs R T'
'Palmer D C'
_publ_section_title
;
 The pressure behavior of alpha cristobalite
 P = room pressure
;
_journal_name_full               'American Mineralogist'
_journal_page_first              9
_journal_page_last               14
_journal_volume                  79
_journal_year                    1994
_chemical_formula_sum            'Si O2'
_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                   4.9717
_cell_length_b                   4.9717
_cell_length_c                   6.9223
_cell_volume                     171.104
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
Si 0.30028 0.30028 0.00000
O 0.23920 0.10440 0.17870
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Si 0.00964 0.00964 0.00973 -0.00038 0.00139 -0.00139
O 0.03055 0.01077 0.01505 -0.00163 0.00471 0.00087