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Uranium Oxysulphide, U3O2S4

Uranium Oxysulphide, U3O2S4 or UO2.2US2, is formed when uranous oxide, urano-uranic oxide, or ammonium uranate is heated in a stream of hydrogen sulphide or carbon disulphide vapour; when one of the oxides is heated with a mixture of ammonium chloride and sulphur; or when uranyl sulphate is heated in hydrogen or with potassium pentasulphide. It is a greyish-black powder, which is decomposed by nitric acid with deposition of sulphur.

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