Source : Webster's Revised Unabridged Dictionary (1913)

Pyrrhotine \Pyr"rho*tine\, Pyrrhotite \Pyr"rho*tite\, n. [Gr. ?
   flame-colored, fr. ? fire.] (Min.)
   A bronze-colored mineral, of metallic luster. It is a
   sulphide of iron, and is remarkable for being attracted by
   the magnet. Called also {magnetic pyrites}.

Source : WordNet®

pyrrhotine
     n : a brownish iron sulfide mineral FeS having weak magnetic
         properties [syn: {pyrrhotite}, {magnetic pyrites}]