Definitions for "Cristobalite"
a white mineral consisting of silica; found in volcanic rocks
This is a particular kind of crystalline silica and it forms by precipitation of tiny crystals in the pores of the Soufriere Hills andesite and by devitrification of the volcanic glass.
The crystalline form of silica stable at high temperatures; cristobalite is formed when quartz is heated at temperatures above about 1200 C.
Simplest crystallographic form of SiO2.