Crossword clues for the word: TUFA The word TUFA has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for TUFA Showing 1 to 11 of 11 results Clue(s) "Soft, porous rock" Calcite rock Geyseral deposit Hard volcanic rock Lime spring deposit Porous limestone. Porous rock Rocklike lake deposit Soft and porous calcite rock Soft porous rock consisting of calcium carbonate deposited from springs rich in lime Volcano rock.