/usr/share/avogadro/crystals/zeolites/ITR.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 11.6730(0)
_cell_length_b 21.9690(0)
_cell_length_c 25.1700(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 'C m c m'
_symmetry_Int_Tables_number 63
_symmetry_cell_setting orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,+z'
'-x,-y,1/2+z'
'1/2-x,1/2-y,1/2+z'
'-x,+y,1/2-z'
'1/2-x,1/2+y,1/2-z'
'+x,-y,-z'
'1/2+x,1/2-y,-z'
'-x,-y,-z'
'1/2-x,1/2-y,-z'
'+x,+y,1/2-z'
'1/2+x,1/2+y,1/2-z'
'+x,-y,1/2+z'
'1/2+x,1/2-y,1/2+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 0.3058 0.1201 0.1980
O2 O 0.1127 0.0769 0.1590
O3 O 0.2821 0.1125 0.0956
O4 O 0.1617 0.1929 0.1503
O5 O 0.2898 0.1130 0.5977
O6 O 0.3054 0.0780 0.6976
O7 O 0.1121 0.1208 0.6598
O8 O 0.2859 0.1945 0.6748
O9 O 0.1503 0.2295 0.2500
O10 O 0.0000 0.2688 0.1802
O11 O 0.0000 0.4096 0.5706
O12 O 0.1476 0.4994 0.5799
O13 O 0.1648 0.4235 0.5000
O14 O 0.0000 0.4110 0.0699
O15 O 0.0000 0.3847 0.7500
O16 O 0.1378 0.4795 0.7500
O17 O 0.0000 0.4257 0.2500
O18 O 0.0000 0.9789 0.1861
O19 O 0.0000 0.0735 0.2500
O20 O 0.0000 0.1159 0.7500
T1 Si 0.2146 0.1253 0.1502
T2 Si 0.2494 0.1267 0.6576
T3 Si 0.1315 0.2491 0.1890
T4 Si 0.1314 0.4295 0.5618
T5 Si 0.1315 0.4309 0.0617
T6 Si 0.1317 0.4064 0.7500
T7 Si 0.1317 0.4474 0.2500
T8 Si 0.0000 0.0521 0.1888
T9 Si 0.0000 0.0942 0.6889
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