Chalk is made from a soft, white, porous sedimentary rock, which is a form of limestone with mineral calcite. Calcite is calcium carbonate of CaCO3, which is compose of some silt and clay. Chalk can also refer to many other compounds like magnesium silicate and calcium sulfate. Chalk came from the cretaceous period; it was also known to be from the champagne region of France.
To add to the previous answer, it’s true chalk is made up of mainly calcium carbonate (caCO3), a form of limestone. The raw material is made up of a mixture of various natural deposits. When companies manufacture “raw” chalk to make the ones we know in classrooms, they quarry limestone, pulverize the chalk, dehydrate the gypsum, sift, clean, and ship the chalk.
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