/usr/share/avogadro/crystals/zeolites/ETR.cif is in avogadro-data 1.2.0-3.
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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 20.6340(0)
_cell_length_b 20.6340(0)
_cell_length_c 8.4260(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 63 m c'
_symmetry_Int_Tables_number 186
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,+z'
'-x+y,-x,+z'
'-x,-y,1/2+z'
'+y,-x+y,1/2+z'
'+x-y,+x,1/2+z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'+y,+x,1/2+z'
'+x-y,-y,1/2+z'
'-x,-x+y,1/2+z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.7345 0.0750 0.8383
O2 O 0.8326 0.1674 0.0470
O3 O 0.6969 0.1479 0.0370
O4 O 0.7154 0.0390 0.1408
O5 O 0.7238 0.2762 0.1582
O6 O 0.5854 0.1708 0.1019
O7 O 0.6611 0.1553 0.3351
O8 O 0.5827 0.9209 0.0844
O9 O 0.5988 0.0099 0.3195
O10 O 0.5353 0.0707 0.4887
T1 Si 0.7457 0.1073 0.0165
T2 Si 0.6668 0.1872 0.1581
T3 Si 0.6396 0.9739 0.2199
T4 Si 0.6137 0.0787 0.4335
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