/usr/share/avogadro/crystals/clays/FeSi2O6H-Nontronite.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.
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_chemical_name_mineral 'Nontronite'
loop_
_publ_author_name
'Dainyak L G'
'Zviagina B B'
'Rusakov V S'
'Drits V A'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 18
_journal_year 2006
_journal_page_first 753
_journal_page_last 764
_publ_section_title
;
Interpretation of the nontonite-dehydroxylate Mossbauer spectrum using EFG calculations
Sample: tv structure
;
_database_code_amcsd 0007180
_chemical_compound_source 'Garfield, Washington, USA'
_chemical_formula_sum 'Fe Si2 O6 H'
_cell_length_a 5.277
_cell_length_b 9.140
_cell_length_c 9.780
_cell_angle_alpha 90
_cell_angle_beta 101.0
_cell_angle_gamma 90
_cell_volume 463.040
_exptl_crystal_density_diffrn 2.998
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
'x,y,z'
'1/2+x,1/2+y,z'
'x,-y,z'
'1/2+x,1/2-y,z'
'-x,y,-z'
'1/2-x,1/2+y,-z'
'-x,-y,-z'
'1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
FeM 0.50000 0.16670 0.00000
SiT 0.31010 0.32910 0.28410
O1 0.30940 0.31220 0.11480
O2 0.30940 0.50000 0.32930
O3 0.05930 0.75000 0.34800
O-H 0.37410 0.00000 0.10750
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