Crossword Genius

Volcanic glass (8)

Ross

I believe the answer is:

obsidian

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">volcanic glass</span>' is the definition.<br/ ><span class="explanation-format__explanation">(obsidian is a kind of volcanic glass)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Guardian and The Telegraph.
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