Kaolinite is a kind of clay that is made up of really tiny particles called "minerals." These minerals are kind of like little Lego pieces that stick together to make a big block of clay.
Kaolinite usually comes in different colors like white, pink, or gray. It feels kind of soft and silky when you touch it. People use kaolinite for all kinds of things, like making paper, ceramics, and even cosmetics.
Kaolinite is found in many different places all over the world. It likes to hang out in places where there is a lot of rain, because it needs water to form. So, next time you're playing in the mud after a rainstorm, you might be playing with kaolinite!