/usr/share/avogadro/crystals/zeolites/SIV.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 9.8770(250)
_cell_length_b 14.0750(170)
_cell_length_c 28.1310(120)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(700)
_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 0.1780 0.0726 0.4144
O2 O 0.1982 0.2414 0.3752
O3 O 0.0000 0.1271 0.3503
O4 O 0.2492 0.0887 0.3246
O5 O 0.6798 0.9098 0.3356
O6 O 0.6937 0.9837 0.2500
O7 O 0.5000 0.0365 0.3084
O8 O 0.0000 0.9466 0.4441
O9 O 0.7502 0.8941 0.4254
O10 O 0.8003 0.0000 0.5000
O11 O 0.5000 0.8567 0.3994
T1 Si 0.1564 0.1323 0.3662
T2 Si 0.6561 0.0046 0.3047
T3 Si 0.8435 0.9784 0.4459
T4 Si 0.3434 0.8506 0.3839
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