An orthorhombic mineral, PbBi₂S₄; soft; massive, or in needlelike to lathlike crystals in radiating aggregates, commonly intergrown with bismuthinite and other bismuth minerals; sp gr, 7.04 to 7.15; occurs in high-temperature replacement deposits or veins; may be argentiferous (e.g., the variety alaskaite in Colorado) or selenian (e.g., the variety selenbleiwismuthglanz at Falun, Sweden); a source of bismuth.