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producing the chalk. The term chalk is applied to the very fine grained pure white limestone. However, the term is occasionally used to designate the similar fine grained limestones which are not startigraphically same as in Western Europe. Chalk, a sedimentary rock, is a soft form of limestone that is not well cemented and thus is often powdery and brittle. It usually ranges in color from white to light gray to buff and forms from sediment deposited in a saltwater environment. Raw Materials Plankton, a tiny marine organism, concentrates the calcium found naturally in seawater from . 04 percent to 40 percent, which is then precipitated when the plankton dies. To make chalk, limestone is first quarried, generally by an open pit quarry method.