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Iridium Sesquisulphide, Ir2S3

Iridium Sesquisulphide, Ir2S3, is formed by passing hydrogen sulphide into a slightly acid solution of a chloriridite at 100° C.

It is a black, colloidal substance, soluble in aqua regia, giving an iridium chloride, and decomposable at high temperatures, yielding metallic iridium.

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