Bentonite

The bentonite found in the Kutch region of India is of igneous origin. It was formed millions of years ago, possibly from the volcanic ash falling in stagnant saline water in semi-arid conditions. Due to the natural characteristics of these particular volcanic ashes, the chemical composition of this bentonite is somewhat different from the range available in the rest of the world. Most of these deposits are of natural sodium bentonite with higher iron content, which gives them their darker color. Due to the very fine particle size, this bentonite shows extra-ordinary swelling capacity
and bonding powers.