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Ammonium Iridium Alum, (NH4)2SO4.Ir2(SO4)3

Ammonium Iridium Alum, (NH4)2SO4.Ir2(SO4)3.24H2O, prepared in a similar manner to the preceding salt, crystallises in yellowish red octahedra, which melt at 105° to 106° C., yielding a reddish violet liquid. On heating still further the combined water is gradually expelled, whilst at red heat metallic iridium is obtained as residue.

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