/usr/share/avogadro/crystals/zeolites/IFR.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 18.6280(0)
_cell_length_b 13.4360(0)
_cell_length_c 7.6290(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 102.3220(0)
_cell_angle_gamma 90.0000(0)
_symmetry_space_group_name_H-M 'C 2/m'
_symmetry_Int_Tables_number 12
_symmetry_cell_setting monoclinic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,+z'
'-x,+y,-z'
'1/2-x,1/2+y,-z'
'-x,-y,-z'
'1/2-x,1/2-y,-z'
'+x,-y,+z'
'1/2+x,1/2-y,+z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.0609 0.6257 0.8418
O2 O 0.9591 0.5000 0.6849
O3 O 0.9237 0.6848 0.7445
O4 O 0.0000 0.6468 0.5000
O5 O 0.1800 0.6834 0.0700
O6 O 0.1695 0.5000 0.9488
O7 O 0.1850 0.6472 0.7334
O8 O 0.6836 0.6841 0.3252
O9 O 0.7900 0.6277 0.5914
O10 O 0.7328 0.5000 0.3388
T1 Si 0.8375 0.7030 0.7351
T2 Si 0.9859 0.6141 0.6928
T3 Si 0.1488 0.6143 0.8981
T4 Si 0.7553 0.6146 0.3805
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