Fe(1-x)SHexagonal
Pyrrhotite
Fe(1-x)S
SulfidesChemical FormulaFe(1-x)S
Crystal SystemHexagonal
Mohs Hardness4
Specific Gravity4.61
ColorBronze yellow to brownish bronze
LusterMetallic
StreakGrayish black
CleavageNone
FractureUneven to subconchoidal
Occurrence
Found in mafic igneous rocks. Magnetic. Often associated with pentlandite (nickel ore).