Crossword Genius

Hard lump of mineral matter (5)

Ross

I believe the answer is:

stone

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

This is the entire clue.

(Other definitions for stone that I've seen before include "Rock; fruit seed" , "See 19" , "Kernel" , "Boulder" , "See 5" .)

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