Highly corrosion-resistant metallic element (7)

I believe the answer is:

iridium

(Other definitions for iridium that I've seen before include "Colourful compounds come from this" , "number 77" , "Hard metal element, Ir" , "Heavy brittle metal used in alloys, Ir" , "Metallic element resistant to corrosion, atomic no. 77" .)

I've seen this clue in The Times.

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