Vermiculite is found in America and Africa. It is a material with platey structure, somewhat similar to that of mica. When heated to temperatures of 650–1000 C for several expanded vermiculite, or as many as 30 times its original volume by exfoliation of its thin
plates. As a result, the bulk density of vermiculite is only 60 than 130 kg/m3. And concrete made with it is very low resistance, and high shrinkage displays but it is an excellent thermal insulator [10,16].