The Collaborative International Dictionary of English v.0.48:

Troilite \Tro"i*lite\, n. [Named after Dominico Troili, an
   Italian of the 18th century.] (Min.)
   Native iron protosulphide, FeS. It is known only in
   meteoric irons, and is usually in imbedded nodular masses of
   a bronze color.
   [1913 Webster]