The smectite group includes:
beidellite:
(Na,Ca)0.3Al2(Si,Al)4O10(OH)2.nH2O
hectorite:
Na0.3(Mg,Li)3Si4O10(F,OH)2.nH2O
montmorillonite:
(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2(OH)2.nH2O
nontronite:
Na0.3Fe3+2(Si,Al)4O10(OH)2.nH2O
saponite:
(Ca,Na)0.3(Mg,Fe)3(Si,Al)4O10(OH)2.4H2O
sauconite:
Na0.3Zn3(Si,Al)4O10(OH)2.4H2O
stevensite:
(Ca,Na)xMg3-ySi4O10(OH)2
vermiculite:
Mg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4.8H2O
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