Assertion: chalcedony's amount | /r/CapableOf | occur as submicroscopic grains
Facets:
value: within the fluorite
type: LOCATION
Source sentences:
text: Small amounts of bertrandite, a beryllium mineral with a chemical composition of Be 4 Si 2 O 7 (OH) 2 , occurs as submicroscopic grains within the fluorite.