/usr/share/avogadro/crystals/zeolites/MWW.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 14.3900(0)
_cell_length_b 14.3900(0)
_cell_length_c 25.1980(0)
_cell_angle_alpha 90.0000(0)
_cell_angle_beta 90.0000(0)
_cell_angle_gamma 120.0000(0)
_symmetry_space_group_name_H-M 'P 6/m m m'
_symmetry_Int_Tables_number 191
_symmetry_cell_setting hexagonal
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,+z'
'-x+y,-x,+z'
'-x,-y,+z'
'+y,-x+y,+z'
'+x-y,+x,+z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'+y,+x,+z'
'+x-y,-y,+z'
'-x,-x+y,+z'
'-x,-y,-z'
'+y,-x+y,-z'
'+x-y,+x,-z'
'+x,+y,-z'
'-y,+x-y,-z'
'-x+y,-x,-z'
'+y,+x,-z'
'+x-y,-y,-z'
'-x,-x+y,-z'
'-y,-x,-z'
'-x+y,+y,-z'
'+x,+x-y,-z'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.6667 0.3333 0.0000
O2 O 0.5448 0.2724 0.0850
O3 O 0.3953 0.1060 0.1374
O4 O 0.5447 0.2724 0.1890
O5 O 0.6667 0.3333 0.2739
O6 O 0.3869 0.0000 0.2238
O7 O 0.5000 0.0000 0.1419
O8 O 0.5000 0.0000 0.3058
O9 O 0.3935 0.1052 0.3101
O10 O 0.5453 0.2726 0.3593
O11 O 0.3520 0.1760 0.3986
O12 O 0.1821 0.0000 0.4302
O13 O 0.2989 0.1495 0.5000
T1 Si 0.4696 0.2348 0.1370
T2 Si 0.4198 0.2099 0.3443
T3 Si 0.2540 0.1270 0.4401
T4 Si 0.3927 0.0000 0.1601
T5 Si 0.3927 0.0000 0.2876
T6 Si 0.6667 0.3333 0.0637
T7 Si 0.6667 0.3333 0.2101
T8 Si 0.6667 0.3333 0.3377
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