what is limestone used to make
Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3). It is the raw material for the manufacture of quicklime (calcium oxide), slaked lime (calcium hydroxide), cement and mortar. 2  Pulverized limestone is used as a soil conditioner to neutralize acidic soils. 3  It is crushed for use as aggregate âthe solid base for many roads as well as in asphalt concrete.