/usr/share/avogadro/crystals/zeolites/MFI.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 20.0900(0)
_cell_length_b 19.7380(0)
_cell_length_c 13.1420(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 'P n m a'
_symmetry_Int_Tables_number 62
_symmetry_cell_setting orthorhombic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2-x,1/2+y,1/2+z'
'+x,1/2-y,+z'
'1/2-x,-y,1/2+z'
'-x,-y,-z'
'1/2+x,1/2-y,1/2-z'
'-x,1/2+y,-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 0.5012 0.0699 0.7018
O2 O 0.3875 0.0743 0.8008
O3 O 0.3995 0.1366 0.6251
O4 O 0.3972 0.0034 0.6326
O5 O 0.3290 0.0385 0.9722
O6 O 0.3297 0.9555 0.8155
O7 O 0.2571 0.0663 0.8106
O8 O 0.2910 0.1296 0.1060
O9 O 0.2034 0.0455 0.0275
O10 O 0.2936 0.0010 0.1564
O11 O 0.1075 0.1265 0.0883
O12 O 0.0846 0.0370 0.9443
O13 O 0.1301 0.0781 0.7670
O14 O 0.0728 0.9589 0.7832
O15 O 0.2201 0.1313 0.6456
O16 O 0.4911 0.8548 0.7169
O17 O 0.3681 0.8311 0.7743
O18 O 0.4263 0.7500 0.6431
O19 O 0.3217 0.8611 0.9561
O20 O 0.2410 0.8582 0.7990
O21 O 0.2943 0.7500 0.0579
O22 O 0.1976 0.8313 0.0003
O23 O 0.0948 0.7500 0.0205
O24 O 0.0809 0.8670 0.9275
O25 O 0.1177 0.8370 0.7406
O26 O 0.2116 0.7500 0.6913
T1 Si 0.4214 0.0711 0.6898
T2 Si 0.3259 0.0336 0.8500
T3 Si 0.2792 0.0536 0.0655
T4 Si 0.1246 0.0514 0.0481
T5 Si 0.0721 0.0360 0.8233
T6 Si 0.2034 0.0687 0.7197
T7 Si 0.4195 0.8274 0.6805
T8 Si 0.3152 0.8765 0.8361
T9 Si 0.2733 0.8278 0.0402
T10 Si 0.1185 0.8279 0.0183
T11 Si 0.0657 0.8794 0.8087
T12 Si 0.1947 0.8288 0.7092
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