Clue & Answer Definitions. PUMICE (noun) a light glass formed on the surface of some lavas; used as an abrasive. PUMICE (verb) rub with pumice, in order to clean or to smoothen. VOLCANIC (adjective) explosively unstable. igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt.. New York Times - November 28, 2004. USA Today - February 11, 2004. Found an answer for the clue Volcanic rock that we don't have? Then please submit it to us so we can make the clue database even better! Find answers for the crossword clue: Volcanic rock. We have 5 answers for this clue.

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Crossword Clue Dark Volcanic Rock

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Crossword Clue Dark Volcanic Rock

. The Crossword Solver found 30 answers to "volcanically formed rock", 7 letters crossword clue. The Crossword Solver finds answers to classic crosswords and cryptic crossword puzzles. Enter the length or pattern for better results. Click the answer to find similar crossword clues . Enter a Crossword Clue. Sort by Length. # of Letters or Pattern.