/usr/share/avogadro/crystals/zeolites/STW.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 11.8870(0)
_cell_length_b 11.8870(0)
_cell_length_c 29.9150(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 61 2 2'
_symmetry_Int_Tables_number 178
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,1/3+z'
'-x+y,-x,2/3+z'
'-x,-y,1/2+z'
'+y,-x+y,5/6+z'
'+x-y,+x,1/6+z'
'+y,+x,1/3-z'
'+x-y,-y,-z'
'-x,-x+y,2/3-z'
'-y,-x,5/6-z'
'-x+y,+y,1/2-z'
'+x,+x-y,1/6-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.9128 0.0000 0.0000
O2 O 0.3328 0.5726 0.3337
O3 O 0.1216 0.2129 0.9728
O4 O 0.9344 0.0656 0.9167
O5 O 0.8998 0.2081 0.9768
O6 O 0.6402 0.3201 0.0833
O7 O 0.3758 0.3446 0.9664
O8 O 0.7797 0.3169 0.0154
O9 O 0.7752 0.5310 0.0348
O10 O 0.2311 0.3246 0.8971
O11 O 0.5937 0.5594 0.9858
O12 O 0.5837 0.4163 0.9167
T1 Si 0.6917 0.3748 0.0338
T2 Si 0.5318 0.4138 0.9667
T3 Si 0.2997 0.3942 0.8508
T4 Si 0.2432 0.3380 0.9506
T5 Si 0.9670 0.1221 0.9666
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