STUDY OF THE POLYMORPHOUS TRANSFORMATION OF QUARTZ JERDANAK FIELD

Pure crystalline silica at normal pressure experiences at upon heating, structural transformations according to the scheme: α-quartz   β-quartz  β-cristobalite and at subsequent cooling - β-cristobalite  α-cristobalite [1]. However, strictly speaking, in In a number of cases (in particular, for grains of rock crystal), this scheme practically remains only one transformation before the moment of melting, namely  α-quartz  β-quartz.