Assertion: cristobalite | /r/CapableOf | occur as transitional silica polymorph
Facets:
value: during the diagenesis of sediments
type: TEMPORAL
Source sentences:
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.