Marble & Stone Restoration
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Limestone
Limestone is a sedimentary rock composed largely of the mineral calcite (calcium carbonate : CaCO3). Like most other sedimentary rocks, limestones are comprised of grains, however, around 80-90% of limestone grains are skeletal fragments of marine organisms such as coral or foraminifera . Other carbonate grains comprising limestones are ooids , peloids , intraclasts , and extraclasts . Some limestones do not consist of grains at all and are formed completly by the chemical precipitation of calcite or aragonite . i.e. travertine
The solubility of limestone in water and weak acid solutions leads to karst landscapes. Regions overlying limestone bedrock tend to have fewer visible groundwater sources (ponds and streams), as surface water easily drains downward through joints in the limestone. While draining, water and organic acid from the soil slowly (over thousands or millions of years) enlarges these cracks; dissolving the calcium-carbonate and carrying it away in solution . Most cave systems are through limestone bedrock.
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