“…Clay are composed of the octahedral (Al 3+ , Fe 2+ , Fe 3+ , or Mg 2+ ) and tetrahedral (Si 4+ ) structures depending on the type of clay [1]. There are several classes of clays such as smectites (montmorillonite, saponite), mica (illite), kaolinite, serpentine, pylophyllite (talc), vermiculite and sepiolite [2]. Clays are composed by hydrous aluminum, silica, magnesium and iron, it may also contain calcium, potassium and other ions, which are non-clay minerals.…”