The hydrothermal conversion of Na-magadiite in tetramethylammonium hydroxid
e (TMAOH) and 1,4-dioxane to form a new layered silicate structure, assigne
d as KLS1, is described. Total conversion of Na-magadiite to KLS1 was achie
ved in a short reaction time of 4 hours. The nature of the new silicate str
ucture was characterized by using Si-29 MAS NMR and found to contain predom
inantly Q(3) type (SiO)(3)-Si-OH building units.