Crossword Genius

Type of chalcedony (4)

Ross

I believe the answer is:

onyx

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">type of chalcedony</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for onyx that I've seen before include "Stones" , "Quartz with alternating bands of colour" , "Form of agate" , "precious stone" , "Black variety of quartz" .)

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