/usr/share/avogadro/crystals/oxides/TiO2-Brookite.cif is in avogadro-data 1.2.0-3.
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The actual contents of the file can be viewed below.
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# All data on this site have been placed in the public domain by the
# contributors.
#------------------------------------------------------------------------------
#$Date: 2010-06-10 15:11:07 +0000 (Thu, 10 Jun 2010) $
#$Revision: 1210 $
#$URL: svn://cod.ibt.lt/cod/cif/9/9009087.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/. The original data for this entry
# were provided the American Mineralogist Crystal Structure Database,
# http://rruff.geo.arizona.edu/AMS/amcsd.php
#
# The file may be used within the scientific community so long as
# proper attribution is given to the journal article from which the
# data were obtained.
#
data_9009087
loop_
_publ_author_name
'Wyckoff, R. W. G.'
_publ_section_title
;
Second edition. Interscience Publishers, New York, New York
;
_journal_name_full 'Crystal Structures'
_journal_page_first 239
_journal_page_last 444
_journal_volume 1
_journal_year 1963
_chemical_formula_sum 'O2 Ti'
_chemical_name_mineral Brookite
_space_group_IT_number 61
_symmetry_space_group_name_Hall '-P 2ac 2ab'
_symmetry_space_group_name_H-M 'P b c a'
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_length_a 9.184
_cell_length_b 5.447
_cell_length_c 5.145
_cell_volume 257.380
_exptl_crystal_density_diffrn 4.123
_[local]_cod_chemical_formula_sum_orig 'Ti O2'
_cod_database_code 9009087
_amcsd_database_code AMCSD#0011419
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
x,1/2-y,1/2+z
-x,1/2+y,1/2-z
1/2-x,1/2+y,z
1/2+x,1/2-y,-z
1/2+x,y,1/2-z
1/2-x,-y,1/2+z
-x,-y,-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ti 0.12900 0.09720 -0.13710
O1 0.01010 0.14860 0.18240
O2 0.23040 0.11300 -0.46290
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