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Perthite crystals and glass, the latter prepared by melting and quenching the former, were reacted with NaOH solutions and the difference between their crystallization processes was investigated by means of x-ray diffractometry, electron scanning microscope, polarization microscope etc.. Autoclave microscope, which had been specially designed for the present study, enabled us to make direct observations concerning the course of the reactions. When the perthite was used as the starting raw material of the reactions, analcite, nepheline hydrate I, and basic cancrinite were formed, while, when the glass was the starting material, feldspar, quartz, and zeolite P were generated besides them. It has been clarified that the structural difference between the starting raw materials affects not only on the mineral assemblage of the synthesized materials but on the reaction processes and the morphological and the crystallographic characteristics of the formed phases.

STUDIES ON THE CRYSTALLIZATION PROCESS IN THE SYSTEM FELDSPAR-NAOH-H2O AT LOW TEMPERATURES