Troilite
Chemical compound
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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 which is iron deficient. As troilite lacks the iron deficiency which gives... Wikipedia
IMA symbol: Tro
Crystal system: Hexagonal
Color: Pale gray brown
Crystal class: Ditrigonal dipyramidal (6m2); H-M symbol: (6m2)
Crystal habit: Massive, granular; nodular; platey to tabular
Mohs scale hardness: 3.5–4.0
Space group: P62c