/usr/share/avogadro/crystals/oxides/NbO2.cif is in avogadro-data 1.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | # Part of the Crystallography Open Database
# 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/9/9009093.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_9009093
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 'Nb O2'
_chemical_name_mineral NbO2
_space_group_IT_number 88
_symmetry_space_group_name_Hall 'I 4bw -1bw'
_symmetry_space_group_name_H-M 'I 41/a :1'
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_length_a 13.71
_cell_length_b 13.71
_cell_length_c 5.985
_cell_volume 1124.965
_exptl_crystal_density_diffrn 5.900
_[local]_cod_cif_authors_sg_H-M 'I 41/a'
_cod_database_code 9009093
_amcsd_database_code AMCSD#0011425
loop_
_symmetry_equiv_pos_as_xyz
x,y,z
1/2+x,1/2+y,1/2+z
1/2+y,1/2-x,1/2-z
+y,-x,-z
-y,1/2+x,1/4+z
1/2-y,+x,3/4+z
1/2+x,y,3/4-z
+x,1/2+y,1/4-z
1/2-x,1/2-y,1/2+z
-x,-y,+z
-y,x,-z
1/2-y,1/2+x,1/2-z
1/2+y,-x,3/4+z
+y,1/2-x,1/4+z
-x,1/2-y,1/4-z
1/2-x,-y,3/4-z
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Nb1 0.11000 8.12000 5.48000
Nb2 0.13000 3.12000 5.01000
O1 0.98000 6.13000 0.00000
O2 0.97000 1.12000 5.50000
O3 0.28000 0.12000 6.99000
O4 0.26000 6.11000 8.50000
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