data_
_chemical_name_mineral ??
_cell_length_a 3.90241(9)
_cell_length_b 3.90241(9)
_cell_length_c 19.6509(5)
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 299.260(16)
_symmetry_space_group_name_H-M P4/nmm
loop_
	_symmetry_equiv_pos_as_xyz
	 'x, y, z '
	 '-x, y, z '
	 '-x+1/2, -y+1/2, -z '
	 '-x+1/2, y+1/2, -z '
	 '-y, -x, -z '
	 '-y, x, -z '
	 '-y+1/2, -x+1/2, z '
	 '-y+1/2, x+1/2, z '
	 'y, -x, -z '
	 'y, x, -z '
	 'y+1/2, -x+1/2, z '
	 'y+1/2, x+1/2, z '
	 'x, -y, z '
	 '-x, -y, z '
	 'x+1/2, -y+1/2, -z '
	 'x+1/2, y+1/2, -z '
loop_
_atom_site_label
_atom_site_type_symbol
_atom_site_symmetry_multiplicity
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_B_iso_or_equiv
O O   2 0 0 0 1 0
Bi Bi   2 0.5 0 0.06418(8) 1 0
Se1 Se   2 0 0.5 0.5558(3) 0.416(5) 0
Se1 Cl   2 0 0.5 0.5558(3) 0.584(5) 0
Se2 Se   2 0 0.5 0.1500(2) 0.584(5) 0
Se2 Cl   2 0 0.5 0.1500(2) 0.416(5) 0
Bi Bi   2 0.5 0 0.24882(7) 1 0
O O   4 0 0 0.3099(7) 1 0
Bi Bi   2 0 0.5 0.37727(6) 1 0