Ag2SCubic
Argentite
Ag2S
SulfidesChemical FormulaAg2S
Crystal SystemCubic
Mohs Hardness2.5
Specific Gravity7.22
ColorBlack to lead gray
LusterMetallic
StreakBlackish gray
CleavageNone
FractureUneven
Occurrence
Important silver ore. Found in hydrothermal veins. Dark tarnish.