High-Purity Limestone market size is forecast to reach US$1.1 billion by 2027 after growing at a CAGR of 4.1% during 2022-2027. High purity limestone is defined as a carbonate rock with a calcium carbonate content of more than 97 percent (CaCO3, usually as calcite). Lime is a calcium-containing inorganic mineral that is primarily composed of oxides and hydroxides, most commonly calcium oxide and/or calcium hydroxide.