1) Hexagonal mineral 2) Sulfide mineral 
Troilite is a rare iron sulfide mineral with the simple formula of FeS. It is the iron rich endmember of the pyrrhotite group. Pyrrhotite has the formula Fe(1-x)S (x = 0 to 0.2) which is iron deficient. As troilite lacks the iron deficiency which gives pyrrhotite its characteristic magnetism, troilite is non-magnetic. Troilite can be found as a na...
• (n.) Native iron protosulphide, FeS. It is known only in meteoric irons, and is usually in imbedded nodular masses of a bronze color.
variety of the iron sulfide mineral pyrrhotite (q.v.) present in meteorites.[2 related articles]
A non-magnetic form of iron sulfide (FeS) found in a variety of meteorites.
Troilite, named after Dominico Troili, an Italian of the 18th century, is a native iron protosulphide, FeS. It is known only in meteoric irons, and is usually found in imbedded nodular masses of a bronze colour.
Iron(II) sulfide
Iron sulphide, mineral abundant in meteorites and probably present in the Earth's core