Limestone is one of the most popular stones for the architectural purposes especially in places like North America and Europe. It is also used as base material for the roads and foundations, and in the laboratories and scientific purposes like purification of glass. It also removes impurities from the molten form of iron. It is used in the production of Portland cement and in daily life as filler and abrasive in toothpaste. It is also the producer of quicklime and slaked lime.