Crossword Genius

Soft fine-grained white sedimentary rock consisting of almost pure calcium carbonate (5)

Ross

I believe the answer is:

chalk

(Other definitions for chalk that I've seen before include "Substance totally different from cheese!" , "Blackboard writing implement" , "Calcium carbonate" , "Soft white rock used for writing on boards etc" , "Soft white limestone (as distinct from cheese)" .)

I've seen this clue in The Mirror.
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