troilite definitions

Merriam Webster's

noun Etymology: German Troilit, from Domenico Troili, 18th century Italian scientist + German -it -ite Date: circa 1868 a mineral that is a variety of pyrrhotite and that is widely but sparsely distributed (as on earth, in meteorites, and in lunar soil samples)

Webster's 1913 Dictionary

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.