/usr/share/avogadro/crystals/ice/H2O-Ice-Ih.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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#$Date: 2012-02-28 12:14:52 +0000 (Tue, 28 Feb 2012) $
#$Revision: 35911 $
#$URL: file:///home/coder/svn-repositories/cod/cif/1/01/10/1011023.cif $
#------------------------------------------------------------------------------
#
# This file is available in the Crystallography Open Database (COD),
# http://www.crystallography.net/
#
# All data on this site have been placed in the public domain by the
# contributors.
#
data_1011023
_chemical_name_systematic 'Dihydrogen oxide'
_chemical_name_mineral 'Ice Ih'
_chemical_formula_structural 'H2 O'
_chemical_formula_sum 'H2 O'
_publ_section_title
;
A Theory of Water and Ionic Solution, with Particular Reference to
Hydrogen and Hydroxyl Ions
;
loop_
_publ_author_name
'Bernal, J D'
'Fowler, R H'
_journal_name_full 'Journal of Chemical Physics'
_journal_coden_ASTM JCPSA6
_journal_volume 1
_journal_year 1933
_journal_page_first 515
_journal_page_last 548
_cell_length_a 7.82
_cell_length_b 7.82
_cell_length_c 7.36
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 389.8
_cell_formula_units_Z 12
_exptl_crystal_density_meas 0.92
_symmetry_space_group_name_H-M 'P 63 c m'
_symmetry_Int_Tables_number 185
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'x,y,z'
'-y,x-y,z'
'y-x,-x,z'
'y,x,z'
'x-y,-y,z'
'-x,y-x,z'
'-x,-y,1/2+z'
'y,y-x,1/2+z'
'x-y,x,1/2+z'
'-y,-x,1/2+z'
'y-x,y,1/2+z'
'x,x-y,1/2+z'
loop_
_atom_type_symbol
_atom_type_oxidation_number
O2- -2.000
H1+ 1.000
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_Wyckoff_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_attached_hydrogens
_atom_site_calc_flag
O1 O2- 6 c 0.3333 0. 0.0625 1. 0 d
O2 O2- 6 c 0.6667 0. 0.9375 1. 0 d
H1 H1+ 6 c 0.3333 0. 0.174 1. 0 d
H2 H1+ 6 c 0.438 0. 0.026 1. 0 d
H3 H1+ 12 d 0.772 0.105 0.975 1. 0 d
_cod_database_code 1011023
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