White chalk sticks are made mainly from calcium carbonate derived from mineral chalk rock or limestone, while coloured or pastel chalks are made from calcium sulphate in its dihydrate form, CaSO 4♲H 2O, derived from gypsum. Sticks of processed 'chalk' are produced especially for use with blackboards in white and also in various colours. Getsupercustomizedimage, image source: Fork Knife Spoon Patent Art Print Set patent 1445281039, image source: scoutmob.Cardboard box of chalk sticks, made in GDR, currently at the MEK

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