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  2. Chalk - Wikipedia

    en.wikipedia.org/wiki/Chalk

    Chalk and other forms of limestone may be used for their properties as a base. [23] Chalk is a source of quicklime by thermal decomposition, or slaked lime following quenching of quicklime with water. [24] In agriculture, chalk is used for raising pH in soils with high acidity. [25] Small doses of chalk can also be used as an antacid. [26]

  3. Chalk Group - Wikipedia

    en.wikipedia.org/wiki/Chalk_Group

    Chalk is a limestone that consists of coccolith biomicrite. [1] A biomicrite is a limestone composed of fossil debris ("bio") and calcium carbonate mud ("micrite").

  4. Lime (material) - Wikipedia

    en.wikipedia.org/wiki/Lime_(material)

    In the lime industry, limestone is a general term for rocks that contain 80% or more of calcium or magnesium carbonate, including marble, chalk, oolite, and marl.Further classification is done by composition as high calcium, argillaceous (clayey), silicious, conglomerate, magnesian, dolomite, and other limestones. [5]

  5. 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. Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place ...

  6. List of rock types - Wikipedia

    en.wikipedia.org/wiki/List_of_rock_types

    Calcarenite – Type of limestone that is composed predominantly of sand-size grains; Chalk – Soft carbonate rock; Chert – Hard, fine-grained sedimentary rock composed of cryptocrystalline silica; Claystone – Clastic sedimentary rock composed primarily of clay-sized particles; Coal – Combustible sedimentary rock composed primarily of carbon

  7. List of types of limestone - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_limestone

    Carboniferous LimestoneLimestone deposited during the Dinantian Epoch of the Carboniferous Period; Coquina – Sedimentary rock that is composed mostly of fragments of shells; Coral rag – Limestone composed of ancient coral reef material; Chalk – Soft carbonate rock; Fossiliferous limestoneLimestone containing fossils

  8. How Democrats Are Faring In First Tests Of The Trump Backlash

    data.huffingtonpost.com/2017/special-elections

    An analysis of special elections since November offers some clues about the party's changing fortunes.

  9. Agricultural lime - Wikipedia

    en.wikipedia.org/wiki/Agricultural_lime

    Agricultural lime, also called aglime, agricultural limestone, garden lime or liming, is a soil additive made from pulverized limestone or chalk. The primary active component is calcium carbonate . Additional chemicals vary depending on the mineral source and may include calcium oxide .