Crossword Genius

Variety of agate (4)

Ross

I believe the answer is:

onyx

'variety of agate' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for onyx that I've seen before include "Stone-like marble with layered colours" , "Semi-precious stone used in making cameos" , "precious stone" , "Type of agate" , "Mineral with coloured layers" .)

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