Bismuthinite


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bismuthinite

[′biz·məth·ə‚nīt]
(mineralogy)
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.

Bismuthinite

 

(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.

G. P. BARSANOV

References in periodicals archive ?
A vug in the footwall of the Contacto vein, on Level 250, yielded brilliant crystals of arsenopyrite, wolframite, jamesonite and bismuthinite perched on spongy quartz.
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Very similar specimens found at earlier times at Julcani have been identified as bismuthinite and/or boulangerite.
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Finally, sulfides (pyrite, pyrrhotite, lollingite, chalcopyrite, cobaltite, bismuthinite) were deposited.
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