/usr/share/avogadro/crystals/zeolites/MEP.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 13.7050(0)
_cell_length_b 13.7050(0)
_cell_length_c 13.7050(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 m 3 n'
_symmetry_Int_Tables_number 223
_symmetry_cell_setting cubic
loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'+z,+x,+y'
'+y,+z,+x'
'+x,+y,-z'
'+z,+x,-y'
'+y,+z,-x'
'-x,+y,+z'
'-z,+x,+y'
'-y,+z,+x'
'-x,+y,-z'
'-z,+x,-y'
'-y,+z,-x'
'1/2+y,1/2+x,1/2+z'
'1/2+x,1/2+z,1/2+y'
'1/2+z,1/2+y,1/2+x'
'1/2+y,1/2+x,1/2-z'
'1/2+x,1/2+z,1/2-y'
'1/2+z,1/2+y,1/2-x'
'1/2+y,1/2-x,1/2+z'
'1/2+x,1/2-z,1/2+y'
'1/2+z,1/2-y,1/2+x'
'1/2+y,1/2-x,1/2-z'
'1/2+x,1/2-z,1/2-y'
'1/2+z,1/2-y,1/2-x'
'-x,-y,-z'
'-z,-x,-y'
'-y,-z,-x'
'-x,-y,+z'
'-z,-x,+y'
'-y,-z,+x'
'+x,-y,-z'
'+z,-x,-y'
'+y,-z,-x'
'+x,-y,+z'
'+z,-x,+y'
'+y,-z,+x'
'1/2-y,1/2-x,1/2-z'
'1/2-x,1/2-z,1/2-y'
'1/2-z,1/2-y,1/2-x'
'1/2-y,1/2-x,1/2+z'
'1/2-x,1/2-z,1/2+y'
'1/2-z,1/2-y,1/2+x'
'1/2-y,1/2+x,1/2-z'
'1/2-x,1/2+z,1/2-y'
'1/2-z,1/2+y,1/2-x'
'1/2-y,1/2+x,1/2+z'
'1/2-x,1/2+z,1/2+y'
'1/2-z,1/2+y,1/2+x'
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
O1 O 0.0000 0.3439 0.0000
O2 O 0.0962 0.2462 0.1344
O3 O 0.0000 0.4042 0.1822
O4 O 0.2500 0.2500 0.2500
T1 Si 0.0000 0.3098 0.1124
T2 Si 0.1823 0.1823 0.1823
T3 Si 0.2500 0.0000 0.5000
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