Tetradymite Harker D Zeitschrift fur Kristallographie 89 (1934) 175-181 The crystal structure of the mineral tetradymite, Bi2 Te2 S _cod_database_code 1011150 _database_code_amcsd 0018035 10.31 10.31 10.31 24.17 24.17 24.17 R-3 atom x y z S1 0 0 0 Bi1 .392 .392 .392 Te1 .788 .788 .788