Bismuth(III) sulfide

Bismuth(III) sulfide, also known as bismuth sulfide, is a chemical compound. Its chemical formula is Bi2S3. It has bismuth and sulfide ions in it. The bismuth is in its +3 oxidation state.
Properties and preparation.
Bismuth(III) sulfide is a brown solid. It does not dissolve in water. It is made by reacting hydrogen sulfide with a bismuth compound like bismuth(III) chloride.
Occurrence.
It is found as the mineral bismuthinite. Bismuthinite is lead-gray to tin-white, with an iridescent tarnish. It is an important ore of bismuth. It has a metallic color. It was first found in Bolivia. Its specific gravity is around 6.8.