The following Raman shift frequencies are given in cm -1 . In the article by Shebanova and Lazor it is told that "some studies report two additional Raman bands at around 300 and 410-420 cm -1 ". The researchers "note that these lines belong to the characteristic features of spectrum of hematite representing the Eg(3) and Eg(4) modes, respectively" (the reference mentioned is . The reason is the bivalent iron which "makes magnetite easily prone to oxidation".