- $ A{l_2}{O_3}.2{H_2}O$.
- $ 3NaF.Al{F_3}$.
- $ {K_2}S{O_4}.A{l_2}{\\\left( {S{O_4}} \\\right)_3}.24{H_2}O$.
- $ Al{\\\left( {OH} \\\right)_3}$.