Color is silver white with exposed specimens tarnishing black. Luster is metallic. Transparency is opaque. Wires can form coiled clusters that resemble rams horns. Cleavage is absent.
Fracture is jagged.
Streak is silver white. Hardness is 2.5-3. Associated Minerals are silver minerals such as acanthite and prousite , cobaltite , copper , zeolites and quartz . Best Field Indicators are color, tarnish, ductility and crystal habit.