Calcite in the limestone commonly originates from marine organisms but can also be present through groundwater that precipitated the material.

Calcite can either be precipitated or dissolved by ground water depending on several environmental factors. It can become less soluble as the water temperature increases -a peculiar characteristic. In the right conditions, calcite forms mineral coatings that glue the rock grains together or fill cracks and fractures in the stone.

*Limestone Colouring*

The varying colours prevalent in this stone derive from the impurities that are present, especially on weathered surfaces. These impurities can be clay, organic remains, sand and iron oxide. Formations of the stone can be crystalline, granular, clastic or massive and can be classified more precisely as Folk and Dunham.

*Location*

Travertine is a variety of limestone found along the edges of water such as hot and cold springs, streams and waterfalls. The material can reform into marble during geographical shifts over time such as mountain building, and is more resistant then other sedimentary rocks, usually occuring amongst hills and typically amongst clay soils. Examples of huge formations can be seen at County Clare in Ireland, Malham Cove in North Yorkshire and the Isle of White. The material is also prevalent in Sweden, the United States and Vietnam.

*Uses*

Limestone is commonly used in architecture across the world in modern construction in Europe and North America and in many older landmarks such as the great pyramids in Egypt which are made entirely from the same. There is a city in Ontario, Canada that is nicknamed Limestone City because every building there is built from it. Limestone is relatively easy to work with and commonly available which is why it gets used extensively in construction despite the cost as it is an expensive material.

*Acid Rain*

Marble and limestone tiles are susceptible to acid rain because of their porous qualities, and this can be a huge problem for statues and buildings alike. When cleaning the stone, a neutral or mild alkaline solution should be used at all times to prevent further erosion of the rock.

Rhythm Device - Acid Rock

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