Pyrrhotite definitions

-tīn'
A brownish-bronze iron sulfide mineral, FeS, characterized by weak magnetic properties and used as an iron ore and in the manufacture of sulfuric acid.
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A bronze-colored, typically magnetic, hexagonal mineral, Fex-1Sx, usually found with pentlandite; iron sulfide.
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(mineralogy) A weakly magnetic ferrous sulfide mineral, FeS.
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Origin of pyrrhotite

Alteration (influenced by –ite) of German Pyrrhotin from Greek purrotēs redness from purros fiery from pūr fire paəwr̥ in Indo-European roots