/usr/share/avogadro/crystals/clays/Al2Si2O9H4-Dickite.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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_chemical_name_mineral 'Dickite'
loop_
_publ_author_name
'Bailey S W'
_journal_name_full 'American Mineralogist'
_journal_volume 48
_journal_year 1963
_journal_page_first 1196
_journal_page_last 1209
_publ_section_title
;
Polymorphism of the kaolin minerals
;
_database_code_amcsd 0000126
_chemical_formula_sum 'Si2 Al2 O9 H4'
_cell_length_a 5.150
_cell_length_b 8.940
_cell_length_c 14.736
_cell_angle_alpha 90
_cell_angle_beta 103.58
_cell_angle_gamma 90
_cell_volume 659.492
_exptl_crystal_density_diffrn 2.600
_symmetry_space_group_name_H-M 'C 1 c 1'
loop_
_space_group_symop_operation_xyz
'x,y,z'
'1/2+x,1/2+y,z'
'x,-y,1/2+z'
'1/2+x,1/2-y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1 0.02880 0.34990 0.04050
Si2 0.54000 0.17680 0.04020
Al1 0.31660 0.49660 0.23200
Al2 0.81160 0.33300 0.23060
O1 0.03850 0.51270 -0.00610
O2 0.73550 0.27760 -0.00580
O3 0.24120 0.23950 0.00580
O4 0.07200 0.36240 0.15230
O5 0.64160 0.16870 0.15260
O-H1 0.57560 0.47420 0.15740
O-H2 0.05090 0.47670 0.29480
O-H3 0.55090 0.35510 0.29810
O-H4 0.96350 0.16680 0.29630
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