The effect of addition of P_2O_5 in a few thousandths on the devitrification behavior of plate glass with primary phase of tridymite is different from that with primary phase of wollastonite.
The notes describe the common minerals such as quartz and its polymorphs, coesite, tridymite and cristobalite, feldspar, plagioclase, feldspathoids, pyroxenes, amphiboles, etc.
The microstructure of crystallized cristobalite, tridymite andmelanophlogite have been studied and the effect of crystallization on sintering of compositealso has been discussed.