/usr/share/avogadro/crystals/ice/H2O-Ice-II.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 II'
loop_
_publ_author_name
'McFarlan R'
_journal_name_full 'Journal of Chemical Physics'
_journal_volume 4
_journal_year 1936
_journal_page_first 60
_journal_page_last 64
_publ_section_title
;
The Structure of Ice II
_cod_database_code 1011063
;
_database_code_amcsd 0017962
_chemical_formula_sum 'O H2'
_cell_length_a 7.8
_cell_length_b 4.5
_cell_length_c 5.56
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 195.156
_exptl_crystal_density_diffrn 1.226
_symmetry_space_group_name_H-M 'C 2 2 21'
loop_
_space_group_symop_operation_xyz
'x,y,z'
'1/2+x,1/2+y,z'
'-x,y,1/2-z'
'1/2-x,1/2+y,1/2-z'
'x,-y,-z'
'1/2+x,1/2-y,-z'
'-x,-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
O1 0.16700 0.20500 0.17800
H1 0.16700 0.00000 0.00000
H2 0.00000 0.25000 0.25000
H3 0.25000 0.45500 0.25000
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