/usr/share/avogadro/crystals/zeolites/CGF.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 15.5010(0)
_cell_length_b 16.9020(0)
_cell_length_c 7.2730(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 96.0700(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 0.0449 0.7411 0.3570
O2 O 0.5727 0.3515 0.6110
O3 O 0.2817 0.6051 0.1917
O4 O 0.2838 0.6326 0.5481
O5 O 0.3013 0.7503 0.3179
O6 O 0.6545 0.2989 0.1408
O7 O 0.1176 0.6472 0.1286
O8 O 0.0000 0.7516 0.0000
O9 O 0.2064 0.6118 0.8508
O10 O 0.1634 0.5000 0.0753
T1 Si 0.8077 0.4089 0.9383
T2 Si 0.0791 0.7344 0.1561
T3 Si 0.3233 0.6587 0.3612
T4 Si 0.2585 0.6735 0.7351
T5 Si 0.0000 0.7964 0.5000
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