Luster is metallic. Crystals are opaque. Crystal Habits include dense or sparse felted masses of acicular crystals. Larger crystals show hexagonal prismatic and pyramidal forms. Streak is steel gray.
Crystals are brittle.
Associated Minerals include quartz, calcite, arsenopyrite , jamesonite , boulangerite and other sulfosalts. Best Field Indicators are crystal habit, associations, color and luster.