Crossword Genius

Agate kin (4)

Ross

I believe the answer is:

onyx

(Other definitions for onyx that I've seen before include "African antelope" , "Quartz with alternating bands of colour" , "Black variety of quartz" , "Marbled stone with layers of colours" , "Marble-like gemstone" .)

I've seen this clue in the LA Times.
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