data_BEC

#**************************************************************************
#
# 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/ 
#
# The atom coordinates and the cell parameters were optimized with DLS76
# assuming a pure SiO2 composition.
#
#**************************************************************************

_cell_length_a                  12.7700(0)
_cell_length_b                  12.7700(0)
_cell_length_c                  12.9770(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 42/m m c'
_symmetry_Int_Tables_number         131
_symmetry_cell_setting             tetragonal

loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'-y,+x,1/2+z'
'-x,-y,+z'
'+y,-x,1/2+z'
'-x,+y,+z'
'+y,+x,1/2+z'
'+x,-y,+z'
'-y,-x,1/2+z'
'-x,-y,-z'
'+y,-x,1/2-z'
'+x,+y,-z'
'-y,+x,1/2-z'
'+x,-y,-z'
'-y,-x,1/2-z'
'-x,+y,-z'
'+y,+x,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     0.0000    0.6199    0.3564
    O2    O     0.8593    0.6567    0.5000
    O3    O     0.8339    0.5000    0.3710
    O4    O     0.8163    0.6942    0.6954
    O5    O     0.0000    0.8804    0.0000
    O6    O     0.0000    0.0000    0.1645
    O7    O     0.8973    0.1797    0.1644
    T1    Si    0.8770    0.6180    0.6168
    T2    Si    0.8070    0.8070    0.2500
    T3    Si    0.0000    0.1192    0.1238

