“…Studies of the sorption of amines and catechols by montmorillonite containing exchangeable transition metal ions, particularly copper, showed that there is a strong tendency to complex formation in the clay interlayers (Bodenheimer et al, 1962;Bodenheimer, Kirson & Yariv, 1963;Bodenheimer, Heller & Yariv, 1963a, b, 1964, 1966a, b, 1967. Amines, particularly diamines, can be extracted by copper *Present address: Department of Geology, Hebrew University, Jerusalem.…”