FeS2Orthorhombic
Marcasite
FeS2
SulfidesChemical FormulaFeS2
Crystal SystemOrthorhombic
Mohs Hardness6.5
Specific Gravity4.89
ColorPale brass yellow
LusterMetallic
StreakGrayish black
CleavageNone
FractureUneven
Occurrence
Polymorph of pyrite. Less stable. Found in sedimentary rocks.