What are the ingredients of chalk?

Answer

The main ingredients in white chalk is calcium carbonate, which is a type of limestone. The main ingredient in pastel chalks is calcium sulfate, which comes from gypsum, an evaporite mineral that is formed by the deposits of ocean brine. Gypsum also occurs in limestone. Pastel chalks also contain oils and clays for binding and pigments for the color. While care is taken to ensure that there are no contaminants in chalk, some impurities can remain. These are mostly silica, iron, alumina, phosphorous, and sulfur. In some cases, copper, manganese, titanium, potassium oxide, sodium oxide, fluorine, and arsenic may also be present.
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Q&A Related to "What are the ingredients of chalk?"
This is not the answer, it is a question. Is it calcium carbonate?
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Chalk is generally considered to be non-poisonous, but it can cause problems if large amounts are swallowed.
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The main ingredients in white chalk is calcium carbonate, which is a type of limestone. The main ingredient in pastel chalks is calcium sulfate, which comes from ...
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