Troilite is a rare iron sulfide mineral with the simple formula of FeS. It is the iron rich endmember of the pyrrhotite group.

troilite
troilite
Arsenic sorption on troilite (FeS) and pyrite (FeS_2)
Arsenite sorption on troilite (FeS) and pyrite (FeS 2 )
I-Xe dating of silicate and troilite from IAB iron meteorites
Origin of rapidly solidified metal-troilite grains in chondrites and iron meteorites
Shock features in iron-nickel metal and troilite of L-group ordinary chondrites
Primary and Secondary Troilite in Ordinary-Chondrite Chondrules: Implications for Chondrule Formation
Troilite in the chondrules of type-3 ordinary chondrites: implications for chondrule formation - The nature of the S- and Ni-bearing...
The Distribution of Troilite in Chondrules from Type-3 Ordinary Chondrites: Implications for the Duration of Chondrule Formation