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    Does "dustfree" school chalk contain any real chalk?

    Question #106155. Asked by flem-ish. (Jun 07 09 11:58 PM)


    joefoxon

    		School 'chalk' is not actually chalk. It is gypsum. Chalk is a form of calcium carbonate (CaCO3). Gypsum is a form of calcium sulphate (CaSO4). So no, it contains no chalk whatsoever. It does, however, contain gypsum.

    http://en.wikipedia.org/wiki/List_of_QI_episodes_(C_series)#Episode_9_.22Creatures.22 It is in that section somewhere, but only vaguely.



    Jun 08 09, 1:10 AM

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