Definition: pyrrhotite

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Source: WordNet (r) 1.7 

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

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.