Illite/Montmorillonite interstratified mineral, Montmorillonite/Illite interstratified mineral
Trioctahedral random interstratified mineral of illite with montmorillonite. The 1:1 regular type is rectorite.
Year of discovery: 1958 (Japan)
Locality list: 41 localities of Illite/Montmorillonite interstratified mineral