Some Aspects of the System H₂O-Na₂O-SiO₂-Al₂O₃

Abstract

A small section of the system $$H_{2}O-Na_{2}O-SiO_{2}-Al_{2}O_{3}$$ was investigated at 300° and 450° Two new hydrated sodium aluminum silicate phases were found and their properties investigated. One of these phases appears optically isotropic and can be told from analcite with difficulty. The existence of solutions containing silica and alumina at these temperatures is demonstrated, and their importance to the granite problem is discussed.