Crossword Genius

Dark volcanic rock (8)

Ross

I think it could be either:

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6

8

obsidian

'dark volcanic rock' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for obsidian that I've seen before include "Dark glassy rock formed from lava" , "A glassy volcanic rock" , "A hard black volcanic glass" , "Glassy black igneous rock" , "Dark volcanic glass" .)

I've seen this clue in The Independent.
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