pyrrhotineMin.|ˈpɪrətaɪn| [Named 1835 f.Gr. πυρρότης redness + -ine5.] = pyrrhotite. 1849J. Nicol Min. 452 Pyrrhotine, Breithaupt; magnetic iron pyrites.1881Metal WorldNo. 21. 323 The ore of the Gap Mine is..a nickeliferous pyrrhotine,..and is extremely difficult to work.