/usr/share/avogadro/crystals/zeolites/LTF.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 31.1670(0)
_cell_length_b 31.1670(0)
_cell_length_c 7.6010(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 m c'
_symmetry_Int_Tables_number 194
_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,1/2+z'
'+x-y,-y,1/2+z'
'-x,-x+y,1/2+z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'-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,1/2-z'
'-x+y,+y,1/2-z'
'+x,+x-y,1/2-z'
'+y,+x,-z'
'+x-y,-y,-z'
'-x,-x+y,-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.0000 0.4177 0.5000
O2 O 0.0941 0.4870 0.4785
O3 O 0.0700 0.3969 0.5771
O4 O 0.0562 0.4140 0.2500
O5 O 0.1845 0.5121 0.5770
O6 O 0.2486 0.4972 0.7500
O7 O 0.1538 0.4288 0.7500
O8 O 0.1671 0.5266 0.2500
O9 O 0.1621 0.5810 0.5045
O10 O 0.0000 0.1626 0.5000
O11 O 0.0560 0.2229 0.2500
O12 O 0.0945 0.1891 0.4812
O13 O 0.0684 0.2538 0.5770
O14 O 0.0864 0.3339 0.7500
O15 O 0.1523 0.3046 0.7500
T1 Si 0.0550 0.4290 0.4519
T2 Si 0.1520 0.5267 0.4525
T3 Si 0.0547 0.2070 0.4523
T4 Si 0.1928 0.4873 0.7500
T5 Si 0.0953 0.3894 0.7500
T6 Si 0.0940 0.2865 0.7500
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