The stable intercalation compounds were synthesized by ion exchange reaction of the cations（Ca²⁺, Mg²⁺, etc.）existing in the interlayer of the 2:1 type layered natural aluminosilicate with n-decylammonium ion and by successive molecular intercalation reaction of the primary n-alcanol(ROH, R = C₁₀H₂₁, C₁₂H₂₅, C₁₄H₂₉).
The charge densities were calculated from the basal spacings of n-decylammonium derivatives under primary n-alcanol.
As the result, the aluminosilicates used in this study have the charge density of 0.25, 0.34 per formula unit and interlayer cation exchange capacity of 69.3, 92.4 meg./100g, respectively.