The Recent Interesting Topics in the Clay Mineralogy

Abstract

Four interesting topics in the clay mineralogy are discussed. They are; 1. fine structure of clay minerals, 2. the structure of water molecules in the interlayer, 3. the “particle” of clay mineral, and 4. the interstratified minerals.
With regard to the point 1, the location of the layer charge caused by the chemical substitution is discussed. The problem on the water molecules is selected in 2 and the theme whether the ice structure is correct or not is discussed.
In 3, the “fundamental particle” proposed by Nadeau (1985) is discussed.
In 4, the structure, crystal chemistry and mechanism of I/S mixed layer are summarized, and the theme to be discussed was pointed out.