Crossword Genius

Light volcanic rock (6)

Ross

I believe the answer is:

pumice

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">light volcanic rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for pumice that I've seen before include "Mineral" , "Porous lava" , "Light, porous volcanic rock" , "Lava stone" , "Light form of solidified lava" .)

I've seen this clue in the Sydney Morning Herald.
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