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Bentonite is a kind of clay rock, also called montmorillonite clay rock
Containing a small amount of illite, kaolinite, chlorite, halloysite, zeolite, quartz, feldspar, calcite; usually white, pale yellow, because of iron content change was light gray, light green, pink, brown red, brick red and black grey; with a waxy, earthy or oily luster; some bentonite the loose soil, there are dense and hard. The main chemical components are silica, three, two aluminum and water, and also contains iron, magnesium, calcium, sodium, potassium and other elements. The contents of Na2O and CaO have great influence on the physicochemical properties and technological properties of bentonite. Montmorillonite is monoclinic, usually in the shape of soil block, white, sometimes reddish, greenish, yellowish color. Lustrous. Hardness 1~2, density 2 ~ 3g/cm3. Montmorillonite can be divided into sodium based bentonite (alkaline soil), calcium based bentonite (alkaline earth soil) and natural bleaching soil (acid soil or acid clay) according to the type, content and interlayer charge of Montmorillonite
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