Crossword clues for the word: SCORIA The word SCORIA has appeared as an answer to at least 7 crossword clues on different crossword puzzles. Crossword clues for SCORIA Showing 1 to 7 of 7 results Clue(s) Cellular lava Cindery lava Ore slag Slag. Smelter slag Smelting slag Volcanic rock ejecta