ODM2 Variable Name Controlled Vocabulary ODM2 Working Group A vocabulary for describing the name of Variables. Cristobalite The mineral cristobalite is a high-temperature polymorph of silica, meaning that it has the same chemical formula as quartz, SiO2, but a distinct crystal structure. Wikipedia https://en.wikipedia.org/wiki/Cristobalite Added to support Critical Zone Observatory (CZO) data use cases.