Pyrolusite Kondrashev Y D, Zaslavskii A I Izvestiya Akademii Nauk SSSR 15 (1951) 179-186 The structure of the modifications of manganese oxide _database_code_amcsd 0017791 4.388 4.388 2.865 90 90 120 P4_2/mnm atom x y z Mn 0 0 0 O .302 .302 0