The bentonite mainly has white cheese color, light gray, light yellow-green meat, red brick, red, light red, maroon and black
mottled color.Most of them are dense and hard blocks, a few are earthy, and the ones with strong swelling force are porous or foamlike on the outcrop.A waxy or earthy sheen;Opacity hardness 2.0~2.5;The proportion of 2.0 ~ 2.7;Melting point 1330~1430 bentonite has water absorption, expansion, bonding, adsorption, lubrication, catalytic activity, thixotropic plasticity and cation
exchange properties. According to the types, content and crystalline chemical properties of interlayer exchangable cations contained in montmorillonite, bentonite can be divided into sodium-based, calcium-based, magnesium-based and calcium-basedSodium bentonite and other different types.