/usr/share/avogadro/crystals/zeolites/IWS.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 26.6890(0)
_cell_length_b 26.6890(0)
_cell_length_c 12.9080(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 'I 4/m m m'
_symmetry_Int_Tables_number 139
_symmetry_cell_setting tetragonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,1/2+z'
'-x,-y,+z'
'1/2-x,1/2-y,1/2+z'
'-y,+x,+z'
'1/2-y,1/2+x,1/2+z'
'+y,-x,+z'
'1/2+y,1/2-x,1/2+z'
'-x,+y,-z'
'1/2-x,1/2+y,1/2-z'
'+x,-y,-z'
'1/2+x,1/2-y,1/2-z'
'+y,+x,-z'
'1/2+y,1/2+x,1/2-z'
'-y,-x,-z'
'1/2-y,1/2-x,1/2-z'
'-x,-y,-z'
'1/2-x,1/2-y,1/2-z'
'+x,+y,-z'
'1/2+x,1/2+y,1/2-z'
'+y,-x,-z'
'1/2+y,1/2-x,1/2-z'
'-y,+x,-z'
'1/2-y,1/2+x,1/2-z'
'+x,-y,+z'
'1/2+x,1/2-y,1/2+z'
'-x,+y,+z'
'1/2-x,1/2+y,1/2+z'
'-y,-x,+z'
'1/2-y,1/2-x,1/2+z'
'+y,+x,+z'
'1/2+y,1/2+x,1/2+z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O11 O 0.0789 0.3234 0.0000
O12 O 0.0000 0.3341 0.1186
O13 O 0.0632 0.2603 0.1533
O14 O 0.0886 0.3536 0.1942
O15 O 0.0987 0.1701 0.1824
O16 O 0.0654 0.1958 0.0000
O17 O 0.0000 0.1852 0.1501
O18 O 0.0704 0.0704 0.5000
O19 O 0.0000 0.0697 0.3571
O20 O 0.0923 0.0923 0.3067
O21 O 0.0830 0.0830 0.1030
O22 O 0.0864 0.4509 0.1646
O23 O 0.0000 0.0700 0.0000
O24 O 0.0000 0.5000 0.3354
O25 O 0.0000 0.4424 0.5000
T1 Si 0.0580 0.3177 0.1165
T2 Si 0.0565 0.2022 0.1226
T3 Si 0.0000 0.4428 0.3755
T4 Si 0.0580 0.0580 0.3807
T5 Si 0.1115 0.1115 0.1954
T6 Si 0.0926 0.4074 0.2500
T7 Si 0.0591 0.0591 0.0000
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