Crossword Genius

Form of chalcedony (4)

Ross

I believe the answer is:

onyx

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of chalcedony</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 "Semi-precious variety of agate" , "Type of agate" , "Marbled stone with layers of colours" , "Black variety of quartz" , "Smooth stone with bands of colour" .)

I've seen this clue in The Times and The Sunday Times.
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