tridymite การใช้

Silification is prominent and has formed cristobalite and tridymite.
Thus although tridymite and cristobalite are common minerals in ignimbrites, they may not be primary magmatic minerals.
Minerals associated with this include quartz, cristobalite and tridymite, which may all be present in volcanic ash.
The high-temperature minerals, cristobalite and tridymite, have both lower densities and indices of refraction than quartz.
In the older trachytes, secondary quartz is not rare, and probably sometimes results from the recrystallization of tridymite.