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A white, insoluble solid occurring naturally as chalk, limestone, marble, and calcite, and forming mollusk shells and stony corals.
- ‘The shells of marine creatures are made of calcium carbonate, the same substance as chalk, which is vulnerable to acidity.’
- ‘Calcium supplements come in various forms with the most popular forms being calcium citrate and calcium carbonate.’
- ‘Corals build their skeletons from waterborne calcium carbonate, the same mineral that makes limestone.’
- ‘Calcium is found in chalk, marble, and limestone, which are all forms of calcium carbonate.’
- ‘When the solution of calcium bicarbonate reaches the open cavern and the water evaporates, carbon dioxide is released and calcium carbonate remains.’
- ‘Members of the order and superfamily Craniacea have subcircular shells composed of calcium carbonate.’
- ‘Calcium carbonate is quite insoluble in water and sinks to the bottom.’
- ‘Karst features are formed by the dissolution of calcium carbonate in limestone bedrock by mildly acidic groundwater.’
- ‘The skeletons of dead chromists accumulate on the floor of lakes and oceans, where they may become thick deposits of silica or calcium carbonate.’
- ‘Oolithic limestones are composed of calcium carbonate in concentric spheres that were produced by high wave energy.’
- ‘Researchers are exploring ways to convert carbon dioxide into calcium carbonate - the equivalent of dirt.’
- ‘Marine sediments are typically rich in calcium carbonate from shells, but increased acidity causes it to dissolve.’
- ‘Hard deposits in the cells, such as calcium carbonate and silica, may have a pronounced dulling effect on cutting tools.’
- ‘Organisms as diverse as phytoplankton, corals, crabs and molluscs lay down limestone or calcium carbonate skeletons.’
- ‘Loosely speaking, calcium carbonate is limestone and there is an awful lot of limestone present throughout the world.’
- ‘Some spicules are formed of the mineralized substances calcium carbonate and silica, while others are made of an organic substance called spongin.’
- ‘Close to the area of their formation these waters are well oxygenated, cold, and supersaturated with dissolved calcium carbonate.’
- ‘Marl is a granular or loosely consolidated earthy material comprised largely of shell fragments and calcium carbonate precipitated in ponds.’
- ‘Antacids based on calcium carbonate have been used for over 2,000 years.’
- ‘When you make cement you make calcium oxide which can react with carbon dioxide and make calcium carbonate.’
- ‘The correct, balanced chemical formula for calcium carbonate is CaCO 3.’
- ‘Mollusc shells are made primarily of calcium carbonate, with traces of strontium and other elements.’
- ‘When water becomes supersaturated in dissolved calcium carbonate, solid calcium carbonate can grow by precipitation from the water.’
- ‘Stalactites grow when water laden with carbon dioxide and calcium carbonate drips from cracks or holes in the cave's ceiling.’
- ‘Insoluble calcium carbonate is basically chalk.’
- ‘Heating and agitation, after the introduction of sodium carbonate, precipitated calcium carbonate, and waste material settled.’
- ‘Maerl is composed of chalk - calcium carbonate - with an outer living plant layer.’
- ‘Last year six British geologists went diving in Greenland in search of ikaite, a rare form of calcium carbonate, which grows from the fjord floor in columns.’
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