Crossword Genius

Black stone (4)

Ross

I believe the answer is:

onyx

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

(Other definitions for onyx that I've seen before include "material for making cameos" , "Cameo material" , "Stone-like marble with layered colours" , "Black variety of quartz" , "Marble-like gemstone" .)

I've seen this clue in the Penny Press and the LA Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.