/usr/share/avogadro/crystals/zeolites/AET.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 32.8290(0)
_cell_length_b 14.3800(0)
_cell_length_c 8.3740(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,+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'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.0880 0.1095 0.7500
O2 O 0.0402 0.1564 0.5111
O3 O 0.0816 0.0000 0.5000
O4 O 0.1197 0.1603 0.4760
O5 O 0.2141 0.1107 0.7500
O6 O 0.2730 0.1208 0.5376
O7 O 0.2136 0.0000 0.5000
O8 O 0.1994 0.1783 0.4641
O9 O 0.1991 0.4151 0.7500
O10 O 0.1680 0.5000 0.5000
O11 O 0.1542 0.3212 0.5454
O12 O 0.1534 0.2609 0.2500
O13 O 0.0000 0.8888 0.7500
O14 O 0.0000 0.0000 0.5000
T1 Si 0.0824 0.1064 0.5593
T2 Si 0.2251 0.1023 0.5633
T3 Si 0.1869 0.4038 0.5649
T4 Si 0.1566 0.2299 0.0657
T5 Si 0.0000 0.8935 0.5583
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