Bentonite - WikipediaBentonite is an absorbent aluminium phyllosilicate clay consisting mostly of montmorillonite. . Calcium bentonite may be converted to sodium bentonite (termed sodium beneficiation or sodium activation) to exhibit many of sodium bentonite's . Bentonites are used for decolorizing various mineral, vegetable, and animal oils.calcium bentonite minerals,Health Benefits of Bentonite Clay | Wellness MamaApr 13, 2017 . Healing clays like Bentonite have a high concentration of minerals including silica, calcium, magnesium, sodium, iron, and potassium. Even Dr.