BENTONITE in clay form is mostly composed of the mineral "Montmorillonite" mixed with some related minerals like Nontronite and Beidellite. These are three layered Aluminosilicate with molecules of water between layers. Chemically the Bentonite is of Sodium & Calcium type (also known as fuller’s earth). Among all other Bentonite available in the world, the sodium variety has high swelling and gelling properties along with good viscosity and liquid limit.
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