Metal of the platinum group (7)

I believe the answer is:

iridium

(Other definitions for iridium that I've seen before include "Silvery-white metal" , "Corrosion-resistant metal, Ir" , "Heavy brittle metallic element of the platinum group" , "Silvery-white metallic element" , "number 77" .)

I've seen this clue in the Sydney Morning Herald.

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