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2. Calcium carbonate - Wikipedia

   en.wikipedia.org/wiki/Calcium_carbonate

   Calcium carbonate is the active ingredient in agricultural lime and is produced when calcium ions in hard water react with carbonate ions to form limescale. It has medical use as a calcium supplement or as an antacid , but excessive consumption can be hazardous and cause hypercalcemia and digestive issues.

3. Limestone - Wikipedia

   en.wikipedia.org/wiki/Limestone

   Limestone (calcium carbonate CaCO 3) is a type of carbonate sedimentary rock which is the main source of the material lime.It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO 3.

4. Agricultural lime - Wikipedia

   en.wikipedia.org/wiki/Agricultural_lime

   The primary active component is calcium carbonate. Additional chemicals vary depending on the mineral source and may include calcium oxide. Unlike the types of lime called quicklime (calcium oxide) and slaked lime (calcium hydroxide), powdered limestone does not require lime burning in a lime kiln; it only requires milling.

5. Travertine - Wikipedia

   en.wikipedia.org/wiki/Travertine

   The calcium carbonate most readily precipitates onto solid surfaces bathed by the groundwater, eventually building up thick deposits of travertine. Because of the role of CO 2 in dissolving and transporting calcium carbonate, it is sometimes described as the carrier CO 2 or simply as the carrier. [25]

6. Carbonate rock - Wikipedia

   en.wikipedia.org/wiki/Carbonate_rock

   Limestone is the most common carbonate rock [3] and is a sedimentary rock made of calcium carbonate with two main polymorphs: calcite and aragonite.While the chemical composition of these two minerals is the same, their physical properties differ significantly due to their different crystalline form.

7. Chalk - Wikipedia

   en.wikipedia.org/wiki/Chalk

   Calcite (calcium carbonate) Chalk is a soft, white, porous , sedimentary carbonate rock . It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor .