Crossword Genius

Lumps of hard mineral matter (5)

Ross

I believe the answer is:

rocks

'lumps of hard mineral matter' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rocks that I've seen before include "Large stones" , "Boulders" , "Ice" , "is brilliant" , "Sways; stuns" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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