Crossword Genius

Variety of agate (4)

Ross

I believe the answer is:

onyx

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

(Other definitions for onyx that I've seen before include "Stone-like marble with layered colours" , "Semi-precious stone used in making cameos" , "precious stone" , "Type of agate" , "Mineral with coloured layers" .)

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