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Bi2S3 A mineral consisting of bismuth trisulfide, which has an orthorhombic structure and is usually found in fibrous or leafy masses that are lead gray with a yellowish tarnish and a metallic luster. Also known as bismuth glance.



(also called bismuth glance), a mineral belonging to the sulfide compounds. Chemical composition, Bi2S3 (81.30 percent Bi, 18.70 percent S), sometimes with admixtures of lead, copper, iron, arsenic, antimony, and other metals. It crystallizes in a rhombic system. The structure consists of linked Bi-S-Bi chains along the C axis. It normally forms acicular crystals, lamellae, radial growths, and fibrous or granular aggregates. It is opaque and silvery-white, with a metallic luster. It tarnishes and becomes covered with a gray film when exposed to air. Its hardness is 2-2.5 on the mineralogical scale, and its density is 6,780-6,810 kg per cu m.

Bismuthinite is formed in hydrothermal, greisen and contact-metasomatic deposits together with arsenopyrite; sulfides of Zn, Pb, Cu, and Fe; and minerals of tin, tungsten and molybdenum, native bismuth, and others. In a zone of oxidation it breaks down slightly and forms secondary oxides (bismite), sulfoxides, and aqueous bismuth carbonates. Bismuthinite is the main mineral from which bismuth is extracted.


References in periodicals archive ?
Quartz veins at American Eagle host extremely course grained bismuthinite in flat, sometimes deformed tabular plates ranging up to 1.
All of the holes intersected a sugary textured quartz vein, containing fine-grained bismuthinite and arsenopyrite, within a biotite augen paragneiss host rock.
The presence of bismuthinite is significant because, at the world-class Pogo gold mine, located approximately 50 kilometres to the west, there is a documented strong positive correlation between bismuth and gold content.
Drilling at both targets encountered sugary textured quartz veins containing fine-grained bismuthinite and arsenopyrite.
Felsic units are from 1 to 10 feet thick and well-mineralized with pyrite, pyrrothite, & bismuthinite in carbonatized quartz veins and veinlets, and as disseminated grains.
Bismuthinite is also common as a major constituent of the quartz veins.
The sulphide assemblage is pyrite - arsenopyrite dominant with lesser amounts of chalcopyrite, sphalerite, bismuthinite and minor tetrahedrite.