Assertion: cristobalite | /r/AtLocation | cooler zones
Facets:
Source sentences:
text: For example, the mineral stratigraphy within compound cooling units of a rhyolitic ash-flow tuff showed tridymite is most abundant (∼25 wt.%) in the central zone where temperatures were highest and occurs along with sanidine as crystals growing into voids; cristobalite and sanidine occur in cooler zones where replacement of glass predominates (30).