Crossword Genius

Volcanic glass (8)

Ross

I believe the answer is:

obsidian

'volcanic glass' is the definition.
(obsidian is a kind of volcanic glass)

This is all the clue.

(Other definitions for obsidian that I've seen before include "Dark volcanic glass" , "Dark volcanic rock" , "A glassy volcanic rock" , "Glass bottle may be in this" , "Glassy black igneous rock" .)

I've seen this clue in The Telegraph.
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