Crossword Genius

Hard rock (6)

Ross

I think it could be either:

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6

7

marble

'hard rock' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for marble that I've seen before include "Ramble (anag.)" , "Small ball of glass used in games" , "Glass ball toy" , "Hard crystalline limestone used for sculptures" , "Hard crystalline metamorphic rock" .)

I've seen this clue in The Independent.
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