Crossword Genius

Form of agate (4)

Ross

I believe the answer is:

onyx

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of agate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for onyx that I've seen before include "Agate with alternating bands of colour" , "Marble-like gemstone" , "Semi-precious stone used in making cameos" , "Variety of agate, used as a gemstone" , "Banded chalcedony" .)

I've seen this clue in The Times.
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