/usr/share/avogadro/crystals/zeolites/IHW.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 13.7470(0)
_cell_length_b 24.0690(0)
_cell_length_c 18.3290(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 a'
_symmetry_Int_Tables_number 64
_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,1/2-y,1/2+z'
'1/2+x,-y,1/2+z'
'-x,1/2-y,1/2+z'
'1/2-x,-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,1/2+y,1/2-z'
'1/2-x,+y,1/2-z'
'+x,1/2+y,1/2-z'
'1/2+x,+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 0.6473 0.5000 0.5000
O2 O 0.5000 0.4547 0.4308
O3 O 0.6320 0.5099 0.3563
O4 O 0.6751 0.4139 0.4133
O5 O 0.7500 0.5425 0.2500
O6 O 0.7415 0.5975 0.3749
O7 O 0.5958 0.6011 0.2831
O8 O 0.7738 0.6504 0.4989
O9 O 0.7427 0.7074 0.3786
O10 O 0.9046 0.6503 0.3970
O11 O 0.7356 0.6845 0.6320
O12 O 0.5955 0.6767 0.5334
O13 O 0.7500 0.7545 0.2500
O14 O 0.5962 0.7685 0.3366
O15 O 0.5000 0.7535 0.4602
O16 O 0.5000 0.7543 0.6037
O17 O 0.5000 0.6763 0.3607
O18 O 0.5000 0.6816 0.2194
T1 Si 0.6137 0.4701 0.4256
T2 Si 0.6807 0.5624 0.3158
T3 Si 0.7893 0.6516 0.4119
T4 Si 0.6947 0.6497 0.5636
T5 Si 0.7128 0.7618 0.3326
T6 Si 0.5000 0.7153 0.5324
T7 Si 0.5000 0.7426 0.3735
T8 Si 0.5000 0.6393 0.2874
T9 Si 0.0000 0.6823 0.3684
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