Bentonite usually forms from weathering of volcanic ash, most often in the presence of water. Bentonite is an absorbent aluminium phyllosilicate clay consisting mostly of montmorillonite. The different types of bentonite are each named after the respective dominant element, such as potassium (K), sodium (Na), calcium (Ca), and aluminium (Al). For industrial purposes, two main classes of bentonite exist: sodium and calcium bentonite.

The chemical formula of Bentonite is Al2H2Na2O13Si4 (Sodium) and Al2H2O12Si4 (Calcium)

Characteristics : Naturally Hard, Controlled Particle size

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