The Influence of residual sodium and aluminium species on the mechanism of commercial and laboratory-synthesized Na-LTA zeolite thermally induced transformation (ZTIT) was investigated A phase transformation route between zeolite and low-temperature carnegieite (It-cam) during heating is evolving in two different pathways In one aspect Na-LTA zeolite transforms directly into It-cam, while in the other transformation unfolds through amorphous state The samples with significant amount of sodium and aluminium residues (1 05-1 06)Na2O (1 02-1 07) Al2O3 2SiO(2) did not show intermediate amorphous state during heat treatment It was implicitly shown that investigated ZTIT process is enhanced by residual species The residues are extracted from all investigated samples during refluxing treatment at 100 degrees C. The intermediary amorphous states were created from all refluxed Na-LTA samples Common characteristics of such prepared amorphous NaAlSiO4 states are narrow temperature stability range (cca 50 degrees C) and low-density (C) 2010 Elsevier B V All rights reserved