Crossword Genius

Banded agate (4)

Ross

I believe the answer is:

onyx

'banded 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 "Form of agate" , "Form of chalcedony" , "Mineral with coloured layers" , "Stone like marble with layered colours" , "Marble-like gemstone" .)

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