FeAsSMonoclinic
Arsenopyrite
FeAsS
SulfidesChemical FormulaFeAsS
Crystal SystemMonoclinic
Mohs Hardness5.5
Specific Gravity6.07
ColorSilver white to steel gray
LusterMetallic
StreakGrayish black
CleavageOne direction
FractureUneven
Occurrence
Most common arsenic mineral. Found in hydrothermal veins.