Stibnite - Sb₂S₃

Habit: Crystals common, commonly in complex aggregates of Acicular crystals, also in radiating or columnar masses often striated or grooved parallel to c. Lead-gray, splendent on Cleavage surfaces, tarnishing blackish or iridescent. Metallic Luster, opaque.

Environment: Occurs most commonly in Hydrothermal vein and replacement deposits.

Etymology: Is from the Greek stibi or stimmi, then Latin stibium the old name for the element antimony (Sb)