Crossword Genius

Solidified lava used as an abrasive (6)

Ross

I believe the answer is:

pumice

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">solidified lava used as an abrasive</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 "Solidified lava used as an abrasive" , "Lava stone" , "Light form of solidified lava" , "Mineral" , "Volcanic stone used as abrasive" .)

I've seen this clue in The Guardian.
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