Crossword Genius

Hard sedimentary rock (9)

Ross

I believe the answer is:

ironstone

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

(Other definitions for ironstone that I've seen before include "Pottery" , "Mineral" , "Material" , "Sort of rock" , "Earthenware" .)

I've seen this clue in The Times.
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