Limestone

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  Limestone  – which is a  sedimentary rock  – is a valuable resource from the Earth’s crust. It has many uses. It can be used as a building material. It is used in the production of cement by heating powdered limestone with clay. Cement is an ingredient in mortar and concrete. Mortar – used to join bricks together – is made by mixing cement with sand and water. Concrete is made by mixing cement with sand, water and aggregate (crushed rock). It is a major ingredient in toothpaste. It can be used as a food additive to provide calcium  ions  for strong teeth and bones. It can be processed as a useful raw material in the chemical industry. It can be used to neutralise acidic soil to allow plants to grow more effectively. This is mainly used for large-scale agriculture. Quicklime and slaked lime can also be used for this purpose, as well as neutralising acidity in water sources such as lakes. Limestone is also used to remove impurities from the blast furnace when making iron. The impuritie

  Limestone is a hard sedimentary rock (formed by the deposit of minerals on the earth's crust within water) and is made up of minerals, calcite and aragonite - different crystal forms of calcium carbonate. Generally limestone is made up of the broken up remains of shells from animals that inhabited the water, as well as other living organisms like coral. These fragments have been deposited on water beds over millions of years to form a hard compressed rock. By volume, limestone accounts for about 10% of all sedimentary rock. Where does Limestone come from? There are countless limestones in existence around the world, even in Britain where it is generally found in the Peak District and the Cotswolds. It was the Romans who first discovered that you could polish British limestone into what they called Marmoro, which gave rise to the Italian word Marmo for marble. British limestones can be found in a range of colours including blacks, pure whites, greys, purples and greens. Unfortunat