/usr/share/avogadro/crystals/zeolites/OFF.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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#**************************************************************************
#
# CIF taken from the IZA-SC Database of Zeolite Structures
# Ch. Baerlocher and L.B. McCusker
# Database of Zeolite Structures: http://www.iza-structure.org/databases/
#
# All data on this site have been placed in the public domain.
# If you use this work in a scientific publication, you are obligated to
# cite its origin.
#
# The atom coordinates and the cell parameters were optimized with DLS76
# assuming a pure SiO2 composition.
#
#**************************************************************************
_cell_length_a 13.0630(0)
_cell_length_b 13.0630(0)
_cell_length_c 7.5650(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(0)
_cell_angle_gamma 120.0000(0)
_symmetry_space_group_name_H-M 'P -6 m 2'
_symmetry_Int_Tables_number 187
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,+z'
'-x+y,-x,+z'
'+x,+y,-z'
'-y,+x-y,-z'
'-x+y,-x,-z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'-y,-x,-z'
'-x+y,+y,-z'
'+x,+x-y,-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.0961 0.1921 0.2244
O2 O 0.8718 0.1282 0.2618
O3 O 0.0365 0.3477 0.3263
O4 O 0.9950 0.2679 0.0000
O5 O 0.2359 0.4718 0.5000
O6 O 0.0756 0.5378 0.5000
T1 Si 0.9998 0.2340 0.2032
T2 Si 0.0964 0.4264 0.5000
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