In steel and copper it makes the metals more workable. Tellurium is also used in blasting caps. Color is tin white often with a muted multi-colored iridescent tarnish. Luster is metallic. Crystals are opaque.
Fracture is uneven.
Streak is tin white. Associated Minerals include poughite , gold , sylvanite and calaverite . Best Field Indicators are tarnish, density, color and cleavage.