/usr/share/avogadro/crystals/zeolites/MFS.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 7.5430(0)
_cell_length_b 14.3880(0)
_cell_length_c 19.0160(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 m m 2'
_symmetry_Int_Tables_number 44
_symmetry_cell_setting orthorhombic
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'
'+x,-y,+z'
'1/2+x,1/2-y,1/2+z'
'-x,-y,+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 0.3258 0.2230 0.2521
O2 O 0.2506 0.2668 0.1212
O3 O 0.0000 0.2057 0.2054
O4 O 0.2489 0.0915 0.1619
O5 O 0.2510 0.5914 0.0332
O6 O 0.1744 0.7591 0.9877
O7 O 0.5000 0.7187 0.0253
O8 O 0.0000 0.0913 0.9489
O9 O 0.0000 0.2383 0.8679
O10 O 0.0000 0.5911 0.8191
O11 O 0.5000 0.0000 0.0953
O12 O 0.1746 0.0000 0.0463
O13 O 0.5000 0.5000 0.9657
O14 O 0.1742 0.5000 0.9172
T1 Si 0.2063 0.1968 0.1848
T2 Si 0.2937 0.7004 0.0421
T3 Si 0.0000 0.2032 0.9482
T4 Si 0.0000 0.6993 0.7977
T5 Si 0.2935 0.0000 0.1166
T6 Si 0.2936 0.5000 0.9873
T7 Si 0.0000 0.5000 0.8683
T8 Si 0.0000 0.0000 0.9978
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