Crossword Genius

Dark glassy volcanic rock also called Iceland agate (8)

Ross

I believe the answer is:

obsidian

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

I've seen this clue in The Mirror.
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