Color is an iron black to dark gray. Luster is metallic. Crystals are opaque. Crystals are sometimes intergrown and form pseudohexagonal plates. Also as disseminated grains and massive.
Cleavage is poor in two directions.
Fracture is conchoidal to uneven. Streak is a black. Associated Minerals include silver , proustite , pyrargyrite , polybasite , sphalerite , quartz , barite , calcite , pyrite , fluorite , galena , tetrahedrite , acanthite and other silver sulfide minerals. Best Field Indicators are good crystal habit, density, softness, association with other silver sulfosalts and lack of cleavage.