Stibnite is an antimony sulfide mineral (Sb2S3). Stibnite is quite distinctive for in forming long, slender crystals. It has a metallic luster, a silvery-gray color, is fairly soft (H=2), and has a dark gray streak. Stibnite has economic value - it's mined in several parts of the world for antimony (Sb). The most significant modern source of stibnite specimens is South China.
Stibnite stick (10.4 cm long) from the Xikuangshan Mine near Lengshuijang in Hunan Province, southern China.
Stibnite mass (7.7 cm long) from the Miocene-Pliocene Inner Carpathian Volcanic Belt at Baia Sprie, Maramures, northern Romania.