Water Insoluble Limestone Lumps are sedimentary rocks composed largely of the minerals calcite and aragonite, which are different crystal forms of Calcium Carbonate [CaCO3]. These Limestone Lumps are reliable and free from impurities. These Limestone Lumps have widespread applications for various construction and industrial purposes. These Water Insoluble Limestone Lumps are also used as white pigment or filler in products such as toothpaste of paints, and as a chemical feedstock.