Assertion: cristobalite | /r/HasProperty | form
Facets:
Source sentences:
text: However, cristobalite is a high temperature phase and forms at temperatures >
text: Cristobalite and tridymite occur naturally in lava formations and these minerals can be formed when silica is heated to very high temperatures.
text: Cristobalite is a rock-forming mineral, and occurs as a transitional silica polymorph in the form of opal-C (opal made of tiny cristobalite spheres) during the diagenesis of sediments made of opaline skeletons of marine organisms.