/usr/share/avogadro/crystals/ice/H2O-Ice-VI.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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_chemical_name_mineral 'Ice VI'
loop_
_publ_author_name
'Kamb B'
_journal_name_full 'Science'
_journal_volume 150
_journal_year 1965
_journal_page_first 205
_journal_page_last 209
_publ_section_title
;
Structure of ice VI
;
_database_code_amcsd 0015417
_chemical_formula_sum '(O H2)'
_cell_length_a 6.27
_cell_length_b 6.27
_cell_length_c 5.79
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 227.622
_exptl_crystal_density_diffrn 1.577
_symmetry_space_group_name_H-M 'P 42/n m c'
loop_
_space_group_symop_operation_xyz
'x,y,z'
'1/2-y,1/2-x,1/2+z'
'y,x,-z'
'y,-x,-z'
'1/2-y,1/2+x,1/2+z'
'x,-y,z'
'1/2-x,1/2+y,1/2-z'
'1/2+x,1/2+y,1/2-z'
'-x,-y,z'
'1/2+y,1/2+x,1/2+z'
'-y,-x,-z'
'-y,x,-z'
'1/2+y,1/2-x,1/2+z'
'-x,y,z'
'1/2+x,1/2-y,1/2-z'
'1/2-x,1/2-y,1/2-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Wat1 0.00000 0.27600 0.38200
Wat2 0.00000 0.00000 0.00000
Wat3 0.50000 0.50000 0.50000
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