Crossword Genius

Banded chalcedony (4)

Ross

I think it could be either:

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4

5

onyx

'banded chalcedony' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for onyx that I've seen before include "Agate with alternating bands of colour" , "Form of chalcedony" , "Sort of agate" , "Gemstone, a variety of chalcedony" , "Stone-like marble with layered colours" .)

I've seen this clue in the Sydney Morning Herald.
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