Clay has different chemicals. Among the practical Building materials for building a building, which has high sales in major distribution centers of building materials, we can mention soil. The type of soil, according to its distinguishing feature, or the grain size, is also placed in different sizes. The sizes available for soil, in relation to its grain, have created a huge transformation for soil structure.

There are different types of Clay minerals, including the following:

1. Kaolinite and refractory clays: this category withstands temperatures below 1520 degrees Celsius and does not change phase, kaolinite, halogite, pyrophyllite, dickite, and nacrite are among this category.
2. Ordinary clay or clay: it has small grains and has good plasticity for mold making. Clay minerals, kaolin (porcelain soil), some quartz minerals, calcite, mica and alumina are in this group. This type of soil is used in Brick making.
3. Bentonite clays: This type of clay has high plasticity, adhesion and water absorption, and when it absorbs water, its weight multiplies, which is used in the ceramic industry. Bentonite is in this category. It is formed from the decomposition of volcanic ash in salty and swampy areas, and the further away from the volcano, the thickness of bentonite decreases. Mineral pumice and ocher flower or Sand with clay are also placed in this type of soil.

The types of clay are:
 

1. Kaolinite and refractory
2. Ordinary clay
3. Retardant
4. Calcareous
5. Red
6. Bentonite
7. bullet
8. Sedimentary