CRYSTAL STRUCTURE OF DEHYDROXYLATED 2M1 SERICITE AND ITS RELATIONSHIP WITH MIXED-LAYER MICA/SMECTITE

Crystal structure of dehydroxylated 2M1 sericite from Goto mine, Nagasaki Prefecture, Japan was investigated, and was compared with the crystal structure of unheated 2M1 sericite. The crystal structure of the dehydroxylated 2M1 sericite showed different site cation occupancies in interlayers. Density distribution in interlayers showed alternating different densities. It was confirmed that the formation of regularly interstratified mica/smectite from the dehydroxylated 2M1 sericite is attributed to the crystal structure of dehydroxylated 2M1 sericite.