data_BCT

#**************************************************************************
#
# 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                   8.9520(0)
_cell_length_b                   8.9520(0)
_cell_length_c                   5.2550(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     'I 4/m m m'
_symmetry_Int_Tables_number         139
_symmetry_cell_setting             tetragonal

loop_
_symmetry_equiv_pos_as_xyz
'+x,+y,+z'
'1/2+x,1/2+y,1/2+z'
'-y,+x,+z'
'1/2-y,1/2+x,1/2+z'
'-x,-y,+z'
'1/2-x,1/2-y,1/2+z'
'+y,-x,+z'
'1/2+y,1/2-x,1/2+z'
'-x,+y,+z'
'1/2-x,1/2+y,1/2+z'
'+y,+x,+z'
'1/2+y,1/2+x,1/2+z'
'+x,-y,+z'
'1/2+x,1/2-y,1/2+z'
'-y,-x,+z'
'1/2-y,1/2-x,1/2+z'
'-x,-y,-z'
'1/2-x,1/2-y,1/2-z'
'+y,-x,-z'
'1/2+y,1/2-x,1/2-z'
'+x,+y,-z'
'1/2+x,1/2+y,1/2-z'
'-y,+x,-z'
'1/2-y,1/2+x,1/2-z'
'+x,-y,-z'
'1/2+x,1/2-y,1/2-z'
'-y,-x,-z'
'1/2-y,1/2-x,1/2-z'
'-x,+y,-z'
'1/2-x,1/2+y,1/2-z'
'+y,+x,-z'
'1/2+y,1/2+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     0.2500    0.2500    0.2500
    O2    O     0.0000    0.2079    0.0000
    T1    Si    0.1769    0.1769    0.0000

