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Smectite group [abbr. Sme ]

Year of discovery: 1976 (Japan)

Locality list: 209 localities of smectite

• [A^+,2+_0.2-0.6][ M_2-3 ][(OH)₂|T₄O₁₀],nH₂O

• Class: Mica supergroup < X^+,2+Cations < 2:1 layer < Planar hydrous < Phyllosilicate subclass < Silicate class
• Class: Phyllosilicate
• System: Monoclinic

Trioctahedral: [ M²⁺₃ ]

Aliettiete

Ferrosaponite

hectorite

Saponite

Sauconite

Stevensite

Yakhontovite

Zincsilite

Dioctahedral: [ M³⁺₂ ]

Beidellite

Montmorillonite

Nontronite

Saliotite

Swinefordite

Volkonskoite