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/usr/share/avogadro/crystals/zeolites/AFG.cif is in avogadro-data 1.2.0-3.

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data_AFG
#**************************************************************************
#
# 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                  12.5480(0)
_cell_length_b                  12.5480(0)
_cell_length_c                  20.7890(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 63/m m c'
_symmetry_Int_Tables_number         194
_symmetry_cell_setting             hexagonal

loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x-y,+z'
'-x+y,-x,+z'
'-x,-y,1/2+z'
'+y,-x+y,1/2+z'
'+x-y,+x,1/2+z'
'-y,-x,+z'
'-x+y,+y,+z'
'+x,+x-y,+z'
'+y,+x,1/2+z'
'+x-y,-y,1/2+z'
'-x,-x+y,1/2+z'
'-x,-y,-z'
'+y,-x+y,-z'
'+x-y,+x,-z'
'+x,+y,1/2-z'
'-y,+x-y,1/2-z'
'-x+y,-x,1/2-z'
'+y,+x,-z'
'+x-y,-y,-z'
'-x,-x+y,-z'
'-y,-x,1/2-z'
'-x+y,+y,1/2-z'
'+x,+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     0.6608    0.6953    0.0606
    O2    O     0.6680    0.6912    0.1868
    O3    O     0.5303    0.7652    0.1288
    O4    O     0.4685    0.5314    0.1253
    O5    O     0.1013    0.8987    0.2500
    O6    O     0.2684    0.1342    0.2500
    O7    O     0.1159    0.8842    0.9819
    T1    Si    0.5817    0.6706    0.1254
    T2    Si    0.2466    0.9965    0.2500
    T3    Si    0.2478    0.0000    0.0000