ThOS Wyckoff R W G Crystal Structures 1 (1963) 294-296 Second edition. Interscience Publishers, New York, New York Note: tetragonal PbFCl structure _database_code_amcsd 0011864 3.963 3.963 6.746 90 90 90 P4/nmm atom x y z Th 0 .5 .200 O 0 0 0 S 0 .5 .647