Bentonite
Bentonite (bentonite clay, mine-ral soap, german Bentonit m) (from the name of Benton's Fort in the USA) is a kind of bleaching clay, consisting mainly of minerals of the group montmorillonite (Al2 (OH) 2 x nH2O) or beidelite (Al2 (OH) 2 x nH2O). Bentonite also includes hydromicans, kaolinite, paligorsk, zeolites, and the like. Bentonites are high-quality plastic clay. In Crimea, also called "circles", which means mineral soap. The color of bentonite - from white to light green and light blue, sometimes - cream, yellow, red or brown.