CLAY MINERALS - USDA
Mg3Si2O5(OH)4, represents the trioctahedral version of the 1:1 layer minerals. 2:1 Clay Minerals The joining of two tetrahedral sheets (one from each side) to one octahedral sheet produces a three-sheet mineral type, which is called 2:1 and is represented by the mica, smectite, and vermiculite groups. Talc [Mg3Si4Oio(OH)2]
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