Crossword Genius

Porous limestone (4)

Ross

I believe the answer is:

tufa

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">porous limestone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for tufa that I've seen before include "Soft, porous rock" , "Porous rock (A, not F)" .)

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