Limestone Pub2902 Missouri Department Of Natural
Jan 06, 2018 Chalk is a form of limestone. What distinguishes limestone and makes it useful is a high calcium content (“calcium” and “chalk” are cognates). Specifically, it is calcium carbonate (CaCO 3), the same substance that makes up seashells. In fact, limestone, a sedimentary rock, is often formed from crushed seashells, compressed over eons.Sep 08, 2015 As it stands, calcium carbonate (in pure form or as limestone) is used as a carrier for most premixed products (drugs, vitamins, trace minerals, nutritional additives and even some concentrates). It is even added at the rate of 0.5 percent in soybean meal as a flow enhancer — a fact largely unknown.