Mount Rushmore's makeup (7)

I believe the answer is:

granite

(Other definitions for granite that I've seen before include "Get rain (anag) - rock" , "Igneous rock, generally composed of feldspar and mica and quartz" , "Very hard type of rock" , "Hard granular rock" , "Constituent in Dartmoor" .)

I've seen this clue in The New York Times.

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