Clay

Name

Formula [16]

%Fe₂O₃ [16]

CEC meq/100g

NAu-1

Nontronite

M+(1.0)[Al_0.58Fe_3.38Mg_0.05][Si_7.00Al_1.00]O₂₀(OH)₄

34.19

74.7 [17]

SWy-1

Montmorillonite (Wyoming)

M+(0.49)[Al_3.01Fe(III)_0.41Mn_0.01Mg_0.54Ti_0.02][Si_7.98Al_0.02]O₂₀(OH)₄

3.35

76.4 [16]

SYn-1

Synthetic montmorillonite

M+(0.22)[Al_3.99Fe(III)trMn_trTi_tr][Si_6.50Al_1.50]O₂₀(OH)₄

0.02

70.0 [16]