Very hard inert element; symbol Ir (7)

I believe the answer is:

iridium

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

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.