Sepiolite
An ideal sepiolite formula is approximately Mg8 Si 12 O 30 OH 4 (OH 2) 4 ·X [R 2+, (H 2 O) 8 ], and palygorskite is MgAlS 8 O 20 OH 3 (OH 2) 4 · X [R 2+, (H 2 O) 4 ]. Where X = octahedral sites in sepiolite which may contain Al, Fe, Mn, or Ni, while in palygorskite may be present Na, Fe, and Mn. Cation exchange capacities are …