/usr/share/avogadro/crystals/zeolites/PON.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 8.9140(0)
_cell_length_b 9.2090(0)
_cell_length_c 16.0870(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(0)
_cell_angle_gamma 90.0000(0)
_symmetry_space_group_name_H-M 'P c a 21'
_symmetry_Int_Tables_number 29
_symmetry_cell_setting orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2-x,+y,1/2+z'
'1/2+x,-y,+z'
'-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 0.3352 0.8557 0.3875
O2 O 0.0931 0.7455 0.4572
O3 O 0.0902 0.8130 0.2995
O4 O 0.0976 0.0198 0.4127
O5 O 0.1414 0.3621 0.8084
O6 O 0.8711 0.4663 0.7784
O7 O 0.0118 0.3151 0.6641
O8 O 0.9860 0.7625 0.0068
O9 O 0.2260 0.6406 0.0700
O10 O 0.9861 0.4845 0.0464
O11 O 0.0855 0.2830 0.3511
O12 O 0.2225 0.4934 0.4320
T1 Si 0.1548 0.8593 0.3892
T2 Si 0.0453 0.6434 0.0722
T3 Si 0.1992 0.4181 0.3426
T11 Si 0.9841 0.3328 0.7624
T12 Si 0.1502 0.5985 0.5012
T13 Si 0.0069 0.1709 0.4144
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